Question about 2002 Chevrolet TrailBlazer

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AC Clutch cycles on and off AC dose not blow cold ???

Chevy Trailblazer 2002 My AC is not working the blower is blowing but no cold air ? the system showes fullly charged ? what is common on this the AC Cluch cycles on and off ?

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  • RobertTRoseC Apr 14, 2009

    I checked the freon and it is hard for me to get a reading because the Clutch keeps cycleing on/off but it is reading good in the green guage.

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Ac low pressure cycling switch, there used to be a techical svc bulletin for it, the bad ones usually had a brown ******** the switch.

Posted on Jul 24, 2009

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Usually means freon is low

Posted on Apr 14, 2009

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SOURCE: Trailblazer A/C clutch blows hot !

It is very interesting. But you can find more detailed information here.

Posted on Aug 09, 2011

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1 Answer

My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

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A/c blower issue. 2202 chevy trailblazer


your blower resistor bad or the blower motor control switch is bad. no air flow from top vent make sure vent open.because you can manual adjust them not to blow air on you.if all is good.you have leaking vacuum hose or vacuum actuator.or air door stuck.the AC and HEATER control switch.is bad.its not allowing vacuum to open air door.

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1 Answer

Ac blows hot air


sounds like you have shorted the a/c cycle switch. when you do this it wont cut the clutch on the compressor this is located on the a/c drier on the fire wall hope this helps you and good luck !!!!

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1 Answer

Blower motor problems/ac problems


List of possibilities :
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3 Answers

Trailblazer A/C clutch blows hot !


If it is cycling then its low on freon .. Try to put in one can and this will take care of your problem.. The cycling is due to being low .. The clutch is operated by a pressure switch .. when the clutch kicks in it pressures up but not enough freon will kick it back off and starts over again ... Thanks Jerry

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blower motor resistor maybe why it only blows on high

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