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When Air cononditoner on rpm dropping - Cars & Trucks

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Ac compressor will drop the rpm by about 350 -450 rpm and this is compensated for by the CPU which increases the fuel setting to maintain constant rpm. Run fault codes if there is a problem

Posted on Dec 29, 2013

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Setting gas and air mix


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with engine running, slowly back out. Rpm should drop. Slowly screw in. Rpm should increase, then drop. Back out to peak rpm then another 1/3 turn. Do screw for each barrel.

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Engine surges when it gets hot. Drops rpm and picks up then drops rpm again


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Have a '99 silverado that will not idle


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Apr 15, 2013 | 1999 Chevrolet Silverado 1500

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2000 suburban 1500 right before air on and right before it turns off enigene drop to about 350 rpms


correct rpms should be ~800rpm ac off, and ~1000 rpm ac on.
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Jan 31, 2013 | 2000 Chevrolet Suburban

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2002 trailblazer. the air all of the sudden started blowing HOT air! also when air is turned on the rpms drop dramaticaly and have even stalled the engine a few times! what gives?


Do you have standard environmental controls or are they of the digital type for one? As far as the RPM's dropping hard, you can have a dry compresser. try a can of " R134 with oil " sounds to me that if all this just started happening with the HOT air and the engine rpm's dropping. you may heve a leak in the system, and if you continue to run it you can cause sever damage to the compresser.

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If i start the car and then start air conditioner the rpm is not automatic increase but decrease what i do?


the rpm will first drop because of the compressor clutch engaging. it should normally drop and then return to normal idle once the computer compensates for the compressor kicking on.

Jul 08, 2009 | 1996 Honda Civic

1 Answer

When i activate the air condition the engine meter, goes up and down.


The "Tachometer" is the gauge that indicates the engine RPM. It is not unusual for the idling RPM to drop slightly when the air conditioner comes on. The air conditioner represents a fairly large load on the engine so when it starts, the RPM will drop slightly. When driving, you'll probably not even notice that the air conditioning is a load on the engine unless you're accelerating uphill, pulling a trailer or passing another vehicle while the vehicle is fully loaded. At idle, the Envoy's computer should detect the falling RPM and make adjustments in fuel delivery to bring the RPM back up.

In any case, it shouldn't be cause for alarm, unless the air conditioner is stalling the engine. If this is the case, you are probably in need of service. The issue of low cooling from the air conditioner while idling in gear (as is the case when stopped in traffic, etc.) is correctable free of charge at the dealership on certain vehicles as a result of a recall. Your dealer can tell you if your vehicle is affected or if there is other recall work pending on your vehicle based on the VIN.

I hope this helps!

Aug 12, 2008 | GMC Envoy Cars & Trucks

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