Question about 1999 Acura TL

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Car has an idling problem, cause A/C not to cool when stopped

I was told my car has an idling problem causing the compressor not to come on when setting at intersection waiting for light to change or even when leaving car running to cool the inside. The A/C is cooling when driving. You can tell the difference in the performance of the engine.

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The a/c loads the engine and will come on good idle or bad, but it does sound like you should have your idle turned up.

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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My 2004 mazda6 jerks while idling with a/c on and in drive


take it to an accredited ac specialist shop as there are two possible reasons
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Why does my saturn sound so bad when idles?


if the car is loud/noisy there is a hole in the exhaust system and this will cause a rough idle because of a loss of back pressure and the vales will not open and close properly resulting in the rough idle it also will make the engine run hotter and this will cause your spark plug gaps to increase and the spark will be less than needed to ignite the fuel in the cylinder for proper combustion which will result in poor gas mileage and lack of power is the check engine light on?

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Car won't idle smoothly with ac on


You may be low on a/c refrigerant. Your car could also be overheating which is affecting the idle sensor. These two may also be related. The motor on the electric radiator fan of this car is the weakest part of the entire cooling system. After a drive, put the car in park and leave the motor and a/c on. Open the hood and check that the electric radiator fan is clicking on regularly. If it seems to be malfunctioning (worn out) then your problem could be that this is causing your radiator to overheat and the a/c compressor as well. When the a/c compressor overheats, it vents freon (by design) to save itself to save itself from permanent damage.

Sep 10, 2013 | Chrysler PT Cruiser Cars & Trucks

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Pt cruiser starts finethen loops at 2200rpm i have changed all sesnsors still no change


Your sensors may be doing exactly what they are meant to do, but it wasn't a bad idea to change them as a starting point. Have you noticed poor cooling from the a/c as well? Open your hood in the driveway and check that your electric radiator fan is turning on regularly once the car warms up. There is a fine dance between the electric radiator fan, the a/c compressor, and the idle sensors on this car. If your problem resolves itself at highway speeds & reoccurs when you stop, then the problem is that your electric radiator fan is in need of replacement. The brushes inside that electric motor do wear out from use - especially in a hot climate - and are not designed to be replaced by a home mechanic. You can have the electric motor rebuilt by a electrical shop - or just replace it yourself with one ordered at any parts counter. When the cooling fan does not switch on at idle speeds, the a/c compressor will overheat and cause it to vent freon to save itself from permanent damage. The overall excess heat buildup in your engine compartment also causes the idle problems where it will surge up and down in slow traffic or at a stoplight. When I changed that motor it solved many inter-related issues that I was having.

Sep 05, 2013 | 2003 Chrysler PT Cruiser

1 Answer

Car overheating on idle


Does the radiator fan come on before it overheats?
And is it boiling over, or just showing hot on the gauge ?
Is the cooling system full of coolant and no air pockets ?
How do you know the thermostat is ok ?

Jul 29, 2012 | 2003 Ford Focus

1 Answer

2000 Saturn SL2 runs fine until stopped at a stop sign, etc., then it seems to idle rough - what could be causing this problem? Was told, maybe old gas since it had been sitting for about 4 months.


reasearch "intake manifold gasket". i have the same car, and the same problem, and everything ive read so far points to the intake manifold gasket. apparently during production there was an error that caused the original gaskets to crease. i would suggest taking some brake or carb cleaner and spraying it around intake #1 while the car is idling in park, this should cause the engine to idle rougher. if it does the gasket is your problem.
here's a link to another thread that sheds a lot of light on the issue, and even has some instructions on how to repair.

Sep 08, 2010 | 2000 Saturn SL

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My AC blows hot air at stop lights. It works great when the car is running on the free way, but does not work when the car slows down. Any idea what the problem is????


Have you radiator clutch fan check out, sounds like its bad, air blows through radiator and a/c condenser while driving and no air blows through at stops, will cause a/c pressure to go up and not cool.

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2007 ford 500 --have two problems the car accelerates and jerks when letting up on brakes -- took to dealer and ''reset transmission'' and having an issue with ac when car idles it stops cooling, when...


if the AC isnt cooling on idle then the fan isnt coming on ,so gas isnt cooling in the rad in front of the car ,now as for the pulling away bit i wiould disconnect the servo vacumn feed pipe and block the end of the pipe and try that in case the diaphragm is letting in air causing the idle to speed up

Jun 04, 2010 | 2007 Ford Five Hundred Limited Sedan

2 Answers

Car over heats within 10 minutes idle or driving


if it was my i would be looking at the drive belt and the water pump give these websites a try www.autozone.com and www.alldatadiy.com if all fails stop by your local library and get your hands on a Haynes auto repair Manual for your car or stop by your lincoln dealership in the service department and ask for the manger but please do not keep trying to drive the car cause it will do damage to the engine nice car wish you the best of luck Michigan Man.

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1 Answer

Air conditioner only works while moving. The AC stops cooling when stopped and idleing. Anyone know what causes this?


Your freon level is low, and not circulating on slow compressor speeds. Stop by any shop that has a sign stating they work on a/c and they can recharge it for you in a few minutes. Here where I live they charge about $20.00 labor plus a charge for the freon they put in, they sell it by the pound.

May 25, 2009 | 2005 Jeep Grand Cherokee

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