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Car revs when AC is on

My car is revving itself when idling with the AC on

Part 1 of 1: Troubleshooting a car that surges when the AC is on. Materials needed. AC thermometer. Safety glasses. Workshop Manual. Step 1: Check the belts. This is a good place to start because. AC is cold only when the engine is revving above certain rpm. When at a stop, the air is warmbut if I put it into neutral and rev the engine to, let's say, 2000+ rpm, AC gets colderor when Im driving, obviously. I know everyone is gonna say something about the condensor fan but would it be the fan given above circumstances What actually happens is that the A/C compressor clutch kicks in so that the drivebelt attached to the A/C compressor pulley wheel is then presented with the additional load required to rotate the compressor internals that circulate the refrigerant. This additional load placed on the engine causes the idle speed to slow down

Typically anything that using a load from the engine will cause the rpms to drop. next time youre in the car and the car is idling steadily turn the steering wheel, youll notice the rpms drop very slightly. This will happen when you turn the headlights on as well. Current build: 1300 lb. custom car w/s16g 4g63. Sep 1, 201 When running without the a/c on, the alternator appeared fine. when you turned on the a/c, the alternator output dropped to 12.5v. After investigation, we found that Ford programmed the ecm to raise the engine rpm to raise alternator output rather than cut off the a/c. Replaced the Alternator and all is well!! Thanks for the hel When the AC is on and the car is in neutral, the engine will periodically rev to 2500 rpm or so, for 3-4 seconds. If the engine happens to be idling correctly, the second I press on the gas the engine revs up to about 2000 rpm higher than I had revved it, stays there for 3-4 seconds, then drops to normal idle again

SOLVED: Car rpms revs up when air condtioner is turned on

  1. g from the engine compartment. It sounds like the engine is revving and will go about 15 seconds and then about a
  2. Some increase is normal because the A/C compressor needs engine power to run. Unless it's affecting the cars ability to drive, I wouldn't worry about it. If it gets worse, it could be your IAC (idle air controle valve) or a fast idle solenoid. Does the A/C work ok
  3. When you turn on the vehicle AC, engine triggers some elements, like air control motor or idle speed, so that idle compressor can be increased by compensating with extra drag. In a situation where the car shakes when AC is on, inaccuracy in this process could be the reason behind it
  4. Bad Air Conditioning Noises. Most people are interested in the noises their system shouldn't be making. They're rightfully concerned the issue could be one of the top three worst AC problems an older car can have. Squealing sounds are perhaps the most common complaint from drivers
  5. On most modern automobiles there is a device used to control the engine RPM at idle. It is called the Idle Air Control valve or IAC for short. When a modern, computer controlled fuel injected engine is at idle, the throttle plate is fully closed..
  6. With the car running and the ac on go look under the hood. The compressor is the very bottom left pully on the block. Now watch the compressor clutch on the belt if you see it start to spent when your rev gos up then stop as your rev gos down then the issue is in your ac

My car engine lags when i switch ON the AC.The RPM drop a bit.My car was quite old but i found the same situation in modern cars also.Except on modern cars,the RPM will be adjusted to normal by ECU.I know that when i switch ON the AC,the clutch at the compressor works.But i wonder whats the relationship with the engine lagging?Does the compressor drains a lot of current from the battery When the AC is not on, there is no resistance being put onto the belts by the compressor. When you turn the AC on, it creates friction to run the compressor. This makes your alternator and belt/pull system work harder. If you are able to, check to.. My 2000 Mustang GT is idleing bad when I turn on the heat or a/c. It idles just fine without them on, and my car drives just fine WITH the heat/ac on (so only when idling!). I have a manual trans with 142,000 GuruTTMTL answered 3 years ago Sir im sure its your aicv.when you turn ac on and rpm drops consider to clean or replace aicv.coz when you put load to the engine which is the ac.aicv should adjust the idle when ac on.trust me its all in the air intake control valve. 2 people found this helpful

How to Troubleshoot a Surge Caused by Car Air Conditioning

My car AC is pretty much useless when idling. It's cool enough if I am moving down the highway. I have a can of coolant for it, however my gauge says that it is already full. What else might be causing the problem? Car Car AC only cold at high speeds, but not low on coolant When you turn on the heat or defrost the engine revs to about 2000 rpms. If it is in gear driving it feels like cruise control is pushing the gas. If it is in neutral, or the clutch pushed in it revs up to about 2000 rpms for a couple of seconds then falls back down to below 1000 where it sounds normal My Ac cools but only at high RPM. A pressure test with AC on max read into the yellow/red zone. I attempted to let refrigerant out, only small amount via gauge only partially engaged. The reading only went higher. With the gauge connected and revving the engine the reading lowered into the yellow. Vehicle Info: 93' Merc

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In order to diagnose this car air conditioning problem, you need to detect which kind of smell blowing out of your car A/C. Regularly cleaning the A/C helps maintain pleasant air inside the vehicle. Sweet or chemical smell. There are various crucial components that constitute an automotive air conditioner, for instance, heater core and radiator One tip is to make sure you are checking the engine idle with the air conditioning and defroster in the OFF setting. With some cars, the onboard computer automatically revs the idle speed slightly when accessories are running, and you won't get a true idle speed if they are at work

If the butterfly is closed too much, the revs will drop too far forcing the engine ECU to open the idle control valve (IAC). It will then try to back off the air through the IAC, but since not enough air is getting passed the butterfly for idle, the revs will drop to far and so the surging cycle repeats I have a 2003 pt cruiser turbo 5 speed. I get a rough idle issuse when I turn on the defrost. I have replaced the plugs with champion idiom plugs gaped at 0.040, plug wires,coil,cam shaft sensor, engine temp sensor,mass air flow sensor. I had the dealership flash the PCM with the updated program. They think I may have water in the fuel tank. I have gone thru 2 tanks of 87 octan gas and added. When an air conditioning system loses its ability to cool properly, it may be necessary to recharge the system with new refrigerant.Keep reading for a R-134a A/C pressure chart and steps on how to recharge the A/C system when the system is low on pressure or has been vacuumed out following a repair AC compressor. Another reason for vibrations when AC is turned on could be a faulty compressor. The most accurate technique for this problem detection is to do a simple observation. Try accelerating your car with AC on and off, and if you find a difference in its pick, then your compressor needs to be replaced Dear all, I have 2012 Hyundai with 1.6 petrol engine. To explain my problem: When i'm driving with a/c on, every time I stop, the car starts vibrating (revs are normal)

Response by poster: A 1999 Camry surely does not use R12, and if you can feel your air conditioner cycling on and off, you probably don't need to have it serviced. Do you get cold air from it? Yes, I do. I'm not sure that this is normal behavior, though, seeing as I have run the air conditioner many, many times in this car during summers past and this has never happened The air conditioner seems to work fine only when the car engines speed (R.P.M.) is fast. when the car is just idling the compressor does not kick on for the A.C. The idle speed control valve was checked by me using the test procedure in the Hayes repair manual (BRIDGING TERMINALS T AND E1) while the engine was idling, and engine speed increased. Compressor seems to work, turns & engine revs drop when ac on, but no cooling. any ideas? Victor from Abuja, Nigeria on August 18, 2020: I m working on a 2011 model of a Kia cerato.. the AC cuts off when the vehicle accelerates even while the clutch still working. What could be the problem? Mike Thomas (author) from Phoenix, AZ on August 07, 2020 Car-Revs-Daily First Look - 2021 McLaren Artura and Elva - Double The Style & Double The Fun. May 6, 2021, 4 am. May 5, 2021, 10 pm by Carl Malek. Getting a two-pair hand in a poker game can be a very advantageous turn of fortune in certain situations, and it also manages to add some extra angles to the game

My 2013 Hyundai i10 has one fan and as far as I can see one coolant temp sensor. I replaced water pump and radiator and coolant temp sensor. When I turn on the ac the fan works and keeps the car cool. When the ac is of the radiator hoses both become same heat after a while and the overflow reservoir starts boiling over and the fan do not kick in If your car AC blows cold air when driving at highway speeds but turns warm at stop lights or when driving at slow speeds, you may have a bad radiator fan or radiator fan relay. Many cars are equipped with two radiator fans, while others have one fan that can run at different speeds. In cars with dual fans, one fan is designed to run at full. The AC system in your car could go through all sorts of problems.One typical issue is the unit not blowing cold air, which could be punishing in hot weather. There could be several causes leading to this condition including compressor issues, low-level of refrigerant, trouble with the heater or AC controls, and others

The average AC compressor clutch replacement cost is between $700 and $1000. Labor costs tend to be about $150 to $250, with the new compressor costing $450 to $850. It's not normally recommended to replace the compressor clutch, but rather, install a whole new compressor. Because the compressor is one of the main parts of the air. Yesterday I bought a 2009 Mercedes CLS 550. I drove 15 miles, then put 15 gallons of gas in it. I drove another 10 miles, and parked in my attached garage. Within an hour, my whole house smelled like gasoline. (The air-conditioning unit is in the garage.) Today, there is a strong gasoline smell coming through the car's air-conditioning

When finished, your air conditioner should make icy cold air, and the whole process should only set you back about 25-35 dollars and 15 minutes of your time. This guide will contain information on how to recharge your air conditioner with refrigerant 134a or r-134a. How Air Conditioners Work: An air conditioner has three main parts. A condenser. 2006 Ford Five Hundred. Our Ford Five Hundred has really never given us any problems but lately the AC only blows cold are when your driving and the RPM's are above 2000. When idle it just blows hot air. It works fine in cooler temperatures (60's-70's) too but of course in Texas we only get cooler temps about 4 months of the year Mechanics often misdiagnose high-pressure gauge readings in a car's air-conditioning system. Although mechanics tell owners that the high pressure is due to a problem with the accumulator or evaporator that is not likely the case. Most high-pressure readings are a result of the freon or refrigerant not cooling.

Overview. Your car shouldn't be making unwanted noises apart from the natural sound of your engine. So, if you're hearing a whining noise when accelerating, then they're most definitely is a problem that requires an immediate solution. However, diagnosing this problem can be tricky, even for the most experienced of mechanics If your car's ac does not come on when you turn it on, there is a big chance the problem is the ac compressor clutch. There are a few reasons why your ac clutch will not engage: Corroded CAN bus harness wires - Corrosion in the CAN bus harness (view on Amazon) wires Is a very common problem that plagues the electrical wires and the connectors If fuel injectors are either clogged or leaking, this can cause the car to struggle when trying to reach high revs. If there are fuel injector problems, these are likely to be accompanied by other problems, including issues with ignition, misfiring and even an increased smell of fuel around the car. Air conditioning draining power With the gauges connected, rev the engine to 2000 RPM and watch what the pressures in the AC system do. Do they move closer together (high side gets lower while low side gets higher) or do they move away from each other? If they move away from each other, start with evacuating and recharging the system and retesting

It doesn't matter if it is in reverse or neutral. When i press on the gas pedal, the engine revs but the car doesn't do anything. After about 30 seconds, the car will move, but very slowly although the rpms are high. The car is fine after about a minute. My car now has 45,000 miles but it has had the problem since 30,000 miles I have a 02 trailblazer my wife drives. when the ac is turned on the idle fluctuates between 1000 rpm and trying to stall and then of course stalls. I cleaned the throttle body and now it wants to idle high about 2000 rpm till it warms up and then 1000 rpm and come down slowly to about 600 rpm and idle steady Your car's ac compressor is a key part of the air conditioning system. If the ac compressor is failing or you have a bad ac compressor, this can negatively affect the engine. The compressor is the air conditioning system's power unit that puts the refrigerant under the correct amount of pressure before it flows into the condenser mechanism I was having issues with my vehicles air conditioning while I was stopped at a light. Here's what I did to remedy the issue. Hope it helps Honda engines will rev higher for a few reasons Higher compression ratio than most other 4-bangers vtec kicks in at about 4300RPM - to produce a slight increase in power to make up for the lower torque. is mainly for fuel efficency on the street if its going to be tracked, having higher revs for a pure N/A 4banger 1. will give you better responce &..

engine revs up and down when idling, only when A/C is on

Use the Cenex® Equipment Lookup feature to help you find which lubricants are recommended for your car. Musty Basement. If you turn on the heater or air conditioner and it smells like a musty basement, you could have mildew growing inside the AC evaporator. Turn off the AC and drive with the fan on high to dry the system out. Burnt Carpe Doing This Will Make Your Car's AC Blow Twice as Cold, DIY life hack and car repair with auto mechanic Scotty Kilmer. Car life hacks. How to fix car ac. Expe.. Car accelerating on its own idle. In the case that the problem is caused by bad idle operation, it's likely that this problem is cause by a faulty idle air control valve. This air control valve of the engine is responsible for controlling the engine revolutions per minute and, when faulty, the vehicle will accelerate on its own If your car stalls at idle, one of the possible causes is a problem in the idle air control actuator. This component is responsible for managing the RPM of the engine at idle speed. It connects to the car's electronic control unit, allowing it to make the necessary adjustments for a more efficient, safer, and smoother idle speed

1. Air filter. Your engine needs air, spark and fuel to run, and the air part of that equation can be compromised quite a bit if the air filter is clogged and dirty. It will literally smother the engine, hurting fuel economy and acceleration. Fortunately, this is the easiest one to fix — just take the old air filter out of the air box. A perfectly-tuned, well-maintained car has a very distinct sound. It has an almost melodic hum that is quite literally pleasant to the ears. For the responsible car owner, the very first sign that there may be a problem with the car is not necessarily the visible cues but rather any change in the way that a car sounds Manual car AC. | Michal Fludra/NurPhoto via Getty Images. RELATED: Why You Should Know the Difference Between Outside Air and Inside Air for Your Car's A/C Why your car AC might not be blowing cold air . Say you turn on your car's AC and, rather than providing you with a refreshing, cool breeze, it hits you with a warm wall of unconditioned air My car's RPM automatically got increased recently while i parked the car for a short while. Since then, it is high and reaches at 2.1 in idle. When i switch ON the airconditioner, the RPM reduces to 1.5 and after a short drive when my car's engine is fully warmed up, RPM fluctuates between 1.5 to 2.2 in a continous rhytm at idle or in.

A car is a machine and a machine has many moving parts. The deceleration may be due to a problem in any of these moving parts. A misaligned timing belt is a VIP on the list of mechanical parts because if it is misaligned even by one tooth and the tension is incorrect - it can cause some serious acceleration issues Without them, your car won't even run. If you are losing power, bad spark plugs could be a problem in some rare scenarios. Mostly you will notice worn spark plugs when your car is misfiring. If your car engine doesn't sound like usual, there is a chance that a spark plug is worn out and the car is running on one cylinder less than usual Step 3 - Engine vacuum is a sealed system and must hold a specific amount to maintain proper idle conditions, inspect the engine vacuum hoses and intake gaskets. Engine Intake Vacuum Leak. Step 4 - The air intake boot or tube is used to deliver air to the intake system of the engine. If this tube becomes loose or broken it can leak un-metered. Mine seems to make this noise when revving at very low revs 1000-1200rpm then less so after that - way before you would be expecting any kind of whistle from the turbo. It makes the noise in synchrony with the engine revving (i.e. when you take your foot off the accelerator it stops then back on it starts again) however the noise carries on.

How to Troubleshoot a Surge Caused by Car Air Conditionin

The car starts up fine but when I press the accelerator there are no revs,it just continues idling.So I tried moving the car off the clutch in 1st gear,when I do this the near side front wing dips and the car won't budge and eventually stalls.I've tried doing the same in reverse and the same thing happens, although without the dip.Any help. engine stays at high revs when shifting / not in gear. I have a 1998 Ford Ranger V-6 and since I've had it the engine likes to stay at 2,000 - 2,500 RPM when out taken out of gear while acceleration for a little before dropping down to idle. I thought this might be the idler motor, so I replaced it but it is still doing it and has been since

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AC Works only when engine is revving high - Car Talk Communit

  1. The AC compressor is one of the crucial parts of a vehicle's air conditioning system. It is in charge of pressurizing the AC system and keeping the refrigerant flowing so that it can work well. Just like any other car part, the AC compressor wears out after some time and needs changing. One of the signs of a bad AC compressor is a sloshing sound
  2. Knowing what the pressures are in the air conditioning system in your car can tell you almost all you need to know about how your system is functioning. if rev motor, low side drops a bit, but high side stays the same 70psI. clutch is engaging when ac button is pressed on, if the fan is also on,disengages if either is turned off. If ac.
  3. g problem. when the car has the aircon turned on, its idle speed in rpm is increased. when you move to Neutral its decreased. try putting the car in neutral and increase the revs. above all else see a mechanic
Turbo Retarder Clutch (TRC) - RoadStars

RPM Flucating when ac is on - Motor Vehicle Maintenance

  1. Got home and began to slowly put the R-134a into the car air conditioner system with the AC turned on and the temperature set fully to cold and the blower fully on. The compressor was fully on and the car just was barely cooling before I began adding the freon into the car - but it certainly was not keeping up and was not cool enough
  2. When the engine is on. When the engine is on and the AC is on high, low pressure readings should be around 30 psi and the high pressure side should be about 250 psi depending on your car. The correct reading will display once the clutch engages and the gauge stops cycling. If there are readings on both the high and low sides but they are not.
  3. That formula is R-134a: the standard and only refrigerant permitted in automotive A/C systems today. R-134a, though safer, is not perfect: Beginning in 2013, R-134a is being replaced by a new formula, HFO-1234yf, available on select U.S. car models. HFO-1234yf is the cleanest, safest refrigerant yet
  4. Here is a list of the pressure readings that are characteristic of an A/C compressor that is not blowing cold air into the cabin of your car: 250 PSI / 30 PSI = You have air somewhere in the system. 250 PSI / 50 PSI = The system is overcharged and the condenser is not cooling. Condenser may be blocked. 225 PSI / 80 PSI = It is likely that the.
  5. An expert that got 10 achievements. Ford Master. 53,816 Answers. Re: idles low when ac/heat is on and lights dim. Fix the idle speed to 850-900 rpm. check the alternator and voltage regulator as the voltage should read 14.5-14.8 volts dc at 1000rpm or higher regardless of what is running. have it bench tested by an accredited auto electrician
  6. Hey guys,I am having some trouble with my AC, i am not to sure what the problem is so any help is greatly appreciated. Basically, when i turn my AC on and put the car in drive, my RPM's drop to about 625 and slowly rise up to 700ish RPM's. Some times when i put it into drive the the AC on..
  7. Hondas love to rev, and 4500rpm is safe in just about any modern 4cyl. Modern engines are also almost entirely idiotproof too, fitted with conservative rev-limiters, the only way you could possibly over-rev is by downshifting at too high a speed for the gear. But when you're going up through the gears, if the car lets you do it, it's safe

rpm's drop when i turn a/c on why? DSMtuners

The REVAi, known as G-Wiz in the United Kingdom, is a small micro electric car, made by the Indian manufacturer Reva Electric Car Company between 2001 and 2012. By late 2013 Reva had sold about 4,600 vehicles worldwide, in 26 countries. Sales in the United Kingdom, its main market, and was replaced by the Mahindra e2o.. In many countries the REVAi does not meet the criteria to qualify as a. Car AC blows warm at idle AC blows warm at idle — 4 reasons. If your car AC blows cold when you're moving but the AC blows warm at idle, slowdowns or stop lights, it can be caused by any of the items listed below. Start by checking the radiator fans #1 cause of AC blows warm at idl Car in P mode RPMS @ 750.2. As I switch AC ON I hear a loud striking noise from somewhere at the bottom of the engine.Within two seconds of it Radiator fan starts rotating.With the striking noise RPMs jump to around 950 RPM and hover between 950 and 900 before coming down to around 750. 3 Other Causes of Car AC Not to Cool at an Idle or a Stop. The car could be overheating - caused by something else other than the cooling fan. Heat transfer from the radiator to the condenser can alter efficiency, if the car is overheating. The AC compressor may not be pumping sufficiently at slower RPM's (revolutions per minute) The first culprit of your car air-conditioning not giving off cold air when the car idling is the lack of air flow in the condenser. What you can do is check whether the electric cooling fan that sits beside the condenser is running. Check whether the electrical connections for the condenser fan is connected and seated firmly

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The air conditioning system in any car is one of the most finicky systems that you have. There can be a number of problems that crop up with air conditioning not working at all to working at a diminished capacity. And for a lot of drivers this is something they may let slide for a Read moreAC Pressure on the Low Side is High, and the High Side is Low: Everything You Need to Kno Letting your car sit for a minute or two right after it starts is a good idea. It helps distribute oil throughout the engine and get the engine block and engine oil up to temperature. Revving the.

Why does the idle jump to 3000 rpm when ac is - CarGuru

But if your primary criterion is finding a car that can idle with the air conditioner on for long periods of time, you can pick any car that appeals to you, Richard. 0 Comments Tag In areas where an idle emissions test is performed, failure is likely. Brad Bergholdt is an automotive technology instructor at Evergreen Valley College in San Jose. Write to him in care of Drive. Start the vehicle and rev the engine to 2,000 RPM. This will draw power on your battery, which should cause your voltage regulator to kick the alternator into high gear. 4. Keep the engine running and retest the battery with the voltmeter. When you read the voltmeter this time, the voltage should go up to at least 13 Instant high revs on start up = damage?. I now kow that a drive by wire throttle = no user control over how an engine behaves on startup, other than switching it off again if you are ready and quick enough (I wasn't). 1) Leave car for two weeks over Christmas and New Year 2) Let oil truly drain out to the sump and get thick and cold 3) Insert and turn ignition key 4) Observe engine fires. 3. Faulty Sensor. It requires more than a car engine and fuel to run on wheels. The air mixes with the fuel to keep the piston in the right position to keep the car moving. If you have clogged or faulty air sensors, the engine wouldn't get the air it needs and misfires. This will, in turn, result in acceleration. 4

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Shim the AC Clutch. When the AC clutch doesn't meet the belt correctly you'll have similar symptoms to low refrigerant charge warm air, revs dropping every 10 or 20 seconds, etc.. Here's how to shim the AC clutch on an S60. Here's how to shim the AC clutch on an 850, V70/XC70 up to 2000, S70, or C70 The first step in finding the source of your car audio static or noise is to determine whether the problem is with the radio, accessories like the built-in CD player, or external accessories like your iPhone. To do this, you'll want to start by turning on your head unit and setting it up so that you can hear the offending noise Over time, the constant exposure to heat, carbon deposits, or age can cause the sensor to fail. When the oxygen sensor fails, the vehicle's computer receives inaccurate information and may cause the engine to run too rich or too lean resulting in rough idle conditions. 6. Motor Mounts. Motor mounts keep your engine attached to the car

First, the air conditioner may not be the problem. Some cars have a shut off feature that will disengage the a/c compressor if your engine is under duress. This typically happens if the engine is too hot, so be sure to check the engine temperature. If it's hot in a situation of car air conditioner blowing hot air , then it's an engine problem Car AC designs are far more robust than they once were, but even a late-model vehicle can lose as much as 10 percent of its refrigerant over a year's time. Why is Your Car AC Blowing Hot air? In most cases, it's due to a loss of refrigerant in the system. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin. The car starts and runs GREAT except for what I think is a high idle when first cranked in the Summer(it takes about 4 mins to idle down to what feels/sounds normal w/ no A/C on), butif I have to drive up a hill, which are numerous around here, it acts like I'm towing an 18 wheeler with a full tanker on it, and the car's A/C on Vacuum leaks is considered the primary cause of engine idle vibrations. The reason is that the intake system is meant to hold up more air when the car is idle than when the vehicle is operational. The greater the load (vehicle is in operation), the less the vacuum. You should also look out for cracks or pores on the air and vacuum hoses

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Engine Revs Very High with AC On Focus Fanatics Foru

1. Resist the urge to panic. It can be difficult to stay calm when you find your car suddenly accelerating on its own. However, you will need a clear mind to get yourself off the road and to a safe place. 2. Hit the brakes. Step on the brake pedal and hold it with all your might to maximize the vacuum power assist To test this, find your radiator fan switch and disconnect the wiring harness. Get a jumper wire and insert it into both contacts, your fan should come on. Another way to test the fan is to turn on the air conditioning. The cooling fan is activated in most—but not all—cars when you turn the AC to either a medium or high speed

Video: Loud revving noise when using air conditioner Chevrolet

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You wait. Only warm air is flowing. Next, you rev the engine a bit expecting the air conditioning to kick in and start cooling the cabin. Nothing. Still no cool air. You think: Where is my cool air and what is going on with my car AC system? There was a time when air conditioning was a special feature in a vehicle Turn off the air conditioner. Running the A/C puts a heavy load on your engine. Turn on the heater. This blows some excess heat from the engine into the car. While it's not ideal on a hot summer day (which is when most vehicles tend to overheat), it does help cool the engine down. Put your car in neutral or park and then rev the engine Well it looks like she's back to stalling again. I think it's related to the AC being on. Seems to only do it when I'm using the AC. My thought is perhaps the compressor is malfunctioning causing a drag on the motor and when the revs are so low it will just stall. I have 72,000 miles so only 3,000 miles on my warranty