Question about Air Conditioning and Heat for Pontiac G6

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Engine revs up and down when airconditioning is on

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The ac compressor takes around 5 hp to drive so when the clutch engages the idle speed will drop around 250rpm amd when the clutch dis-engages the rpm will rise 250 rpm If you have a efi computer controlled vehicle the computer should automatically adjust the rev difference to maintain a constant rpm. If you have a carby vehicle there is a electric over vacuum control that you can fit to the accelerator lever that when the clutch activates the power to the switch from the clutch opens a valve that allows vacuum to pull the throttle open and maintain a constant rpm

Posted on Aug 02, 2013


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I have a 96 1200 bandit.when cold it revs up and down as it shud do but once warm when u let off the throttle and change gear the revs take few seconds to go down the engine still revs on etc. carbs av...

When a engine is cold the revs should be higher ( choke on ) but nit going up and down. If you release the accelerator and the engine still rev's up maybe the accelerator cables are not properly installed on the carbs. Also a air leak is possible. Check the cables and air leaks at manifold including the holes from manifold where vacuum gauges should insert when carb calibration is necessary. Those holes should have some caps on.

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2003 ford escape V6 idles 1000rpm, then drops over 5 seconds and then cycles back to 1000rpm...i recently had alternator replaced. I have regular oil changes. New gas filter. It sounds like something...

A few things that could cause the problem are:1 Airflow meter that is if it is a fuel injected motor. 2 On carburettor models the idle solenoid will do that if it is faulty: 3 Airconditioning compressor or pump will click in and out with a sound causing the revs of the engine to alternate as it uses more or less energy accordingly. Also if the bearings in the compressor are worn in it's early stages of wear could make a similar sound to that of a fan: 4 The electric fan coming on too often because the engine is running very hot, could also cause the clicking sound as the thermostat clicks on and off. I suggest you check the water level in the bottle and in the radiator just to make sure that it's not getting too hot and if the levels are low then you have a problem that must be attended to immediately.

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I recommend that you will post your question under the correct category (Cars & Trucks) and maybe add more details to it, so it will be easier for Experts to understand the question and answer it.

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It will run for awhile then it will just stop and want crank back up im thinking fuel pump because today it quit and i sprayed some starting fluid in to the breather and it tried to start then i had it...

Hi there,

This sounds like an electrical issue.

You will need to extract the diagnostic codes from your vehicle's computer.

This can be done in the following manner:

** Firstly, attempt the first part of the procedure with engine running **

- With gear lever in PARK, start engine and rev up to 2,500rpm, then gradually reduce revs down to idle speed (ie take foot off accelerator).
- Cycle gear lever through the gears (ie down to 1st, then back up to PARK)
- Turn Airconditioning to ON, then OFF
- Turn engine OFF

- Within 5 seconds, turn the Ignition Key in this sequence: ON - OFF, ON - OFF, ON (leave key in ON position)
- If done correctly, a series of 4-digit codes will appear in your ODOMETER display

** Remember, you must complete the ignition key sequence, within 5 seconds.

Please advise which codes appear and I will assist you futher.



Jul 13, 2011 | 1999 Jeep Grand Cherokee

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I have a Dodge intrepid that keeps leaving me stranded. My car just cuts off on me. While I'm driving. Sometimes while my car is in park. It just CUTS OFF! I've noticed lately that as my temp gage...

Hi there,

If you're willing, we can try checking your computer for trouble codes - this will help identify any electrical issues.

Note: there's a 50/50 chance this procedure will work (as this does work on the 1997 model):

- With gear in Neutral, start engine and rev the car to 2,500 rpm, then 'gradually' reduce revs down to idle speed.
- with park brake secure, slowly cycle the gear lever through each position (down to 1st, then back up, ending in Park)
- turn Airconditioning ON, then OFF - turn engine OFF - Within 5 seconds, perform the following Ignition Key sequence (without starting): ON, OFF, ON, OFF, ON (if done correctly, your ODOMETER should display a series of 4-digit codes). Please reply back once you have your codes..... Cheers,

Jul 12, 2011 | 1999 Dodge Intrepid

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Check to ensure that the overdrive is on or you will be running at high revs in top gear.
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radiator partially blocked.
electric fan not operating.
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The timing may be out but it is set by computer and would have to have cambelt setting wrong to cause overheating.
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Fan not coming on with or without aircondition and

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Jun 22, 2010 | 2001 Volkswagen Golf

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Revs up and down at low revs

you need to clean or replace your idle air control valve(IAC). The IAC allows your engine to idle smoothly by opening and closing a valve that allows air flow to the engine that is monitored by the computer. The IAC get dirty causing it to stick and move slower than it should which causes the up and down idle

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Why when i turn on air condition it is slow down

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