Question about 2002 Chevrolet TrailBlazer

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When I turn on the cabin fan my truck tries to quit

The rpm's go way down when I turn on the fan, but then "catches itself" an rpm's go back to normal. It doesn't seem to do this at any other time.

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  • 57 Answers

Check your charging system. Most major part stores do this service for free. You might have a bad voltage gegulator or battery. If not that then something is causin it to draw tooo much porew somewhere. but get it looked at soon.. It might be a potential fire hazzard.

Posted on Jan 04, 2009

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Posted on Jan 02, 2017

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Air conditioner in my 2002 Xterra blows hot air when I am at a standstill. Only works when car is moving.


fazsoliz: If the A/C system is not properly charged, it will not cool properly. Usually it is noticed at low speeds because the compressor is turning slower. If you bring the RPM up, you would probably notice it would start to cool a little better.
HOWEVER, there is a danger if the system has been over charged and you do not have enough air flowing over the condenser to keep the head pressures down. The hotter it is outside and the more overcharged the system, the higher the pressures will be in the system. They can reach dangerously high pressures in excess of 300 psi. This can cause hoses to blow, a/c evaporators and condensers to fail and compressors to fail.
If the refrigerant is contaminated or if the system had been opened and had not been properly evacuated before charging, it could have moisture in it as well as air.
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I have found in very hot climates, that installing an electric fan in place of the engine driven fan made a vast improvement on the performance of the a/c at idle and low speeds. I have an old Mercedes diesel wagon which I converted from R-12 to 134-A.
The a/c would freeze you out on the highway, but you would be better off rolling the windows down in town. I removed the engine driven fan and installed an electric fan. Now the a/c will freeze you out at low speeds if you bring the rpm up to 1100, but is cold enough even at 700 rpm.
You must also check for any type of debris caught up in the a/c condenser. The more trash accumulated in the fins, the more difficulty it will have in dissipating heat. The fan schroud also must be on the radiator, otherwise the fan will have little effect in pulling
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Also, put the system on recirculate after a minute or so. This way you will be cooling the air in the cabin and slowly bringing the temperature if the cabin air down and not having to fight the need to constantly cool hot air coming in from the intake vent.
I hope that what I have offeref for suggestions will help you.

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Sounds like one of the fancy heaters. They have circuit boards that can go bad. don-ohio

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