Question about 1998 Chevrolet Blazer

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Air Conditioning cycles on and off quickly

AC cycles on and off quickly and blows hot air when cycle is off, relatively cool (not cold) air when cycle is on. Any suggestions? I'm tired of the dry suana effect when driving!

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Hello,
had the same prob with my 98 blazer, i tested the conditioning system to see if i could just reboost the freon but he gauge was goin all over the place. if while the vehicle is runnin the compressor sounds like its shuttin off and on and then it needs to be replaced. you can take it in to get a diagnostic test if you dont wanna do it urself. the freon booster and tester is only $30 at a store... BUT hadx to get my system entirely replaced and it ended up costin $700...and now im leakin coolant.....hurray!
anyhow hope i helped......
Mrs. Patten

Posted on Sep 07, 2008

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Sounds like low refrigerent, if it is you have a leak, and this can be a bear to find. I suggest you find a reliable air conditioning tech with the proper equipment to diagnose your problem, as there are many possibilities, and most of them require special equipment to locate problem, and to repair it.

Posted on Sep 04, 2008

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You say that i holds a charge, and the compressore turns, but does the comprressor cycle on and off, as this is indicating that there is enough charge, and once there is low pressure detected, it turns the compressor on, and when it reaches a high pressure, the compressor cycles off.

Lastly, when engine running and AC on, if you feel the 2 pipes going in to the firewall, one should be hot, the other should be cold ???...is this happening ???

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


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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.

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Hey, what setting is your A/C on Max AC? AC? Cycling air in vehicle or taking it from outside

The car icon on the right in this image is what I'm referring to when I say cycling air in vehicle.

373a147.jpg
Also, do you ever have cold air blowing? on any setting or any speed? if not, find your A/C fan, it is smaller the the engine cooling fan, sometimes there are 2 fans together. The AC fan should be located at the front of the vehicle and is usually electrically powered.

Also try to find your compressor, looks something like this:
730c4b9.jpg

is it running? is one pipe hot and one cold? (the pipes I am referring to are inlet and outlet pipes of the A/C compressor unit.)

Hope this helps, keep me posted

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