1998 Chevy Blazer Blowing Hot Air and Compressor Not Engaging
My 1998 Chevy Blazer is blowing hot air with the compressor not engaging when I turn on the A/C. A similar thing happened about 2 years ago, but the compressor was turning on and off while now it never switches on (fixed that with a refrigerant recharge). I checked my refrigerant level this time and it appears to be filled up to the correct level (estimated using the color coded gauge on a R-134a refill can so probably not very precise).
While the compressor does not engage automatically I was able to trigger it by crossing the input switch (don't know the correct name) that goes into the compressor using a paper clip. After crossing the wires on this switch the compressor purrs like a kitten. However after running the compressor for a couple minutes I did not notice any change in the A/C temp.
I am a bit of a novice so I am not quite sure if this is a bad compressor, bad pressure switch, a simple overfill or something else. Any help would be appreciated as I would love to fix this thing myself and save some of the little money I make!
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Re: 1998 Chevy Blazer Blowing Hot Air and Compressor Not...
You would be low on 134a. To put refegerant in an a/c system you need to pull a vaccume on the system. Any air in there it will not work. It would be worth the money to have some one do it. But I'd look at the compressor case halfs and see if they are leaking before having it charged. You could fix that yourself and pay some one to charge it, if they are leaking.
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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.
if the a/c compressor clutch is not engaging, you will never have any cold air. if the system has too much or too little freon in it, that will also mess it up. If system is undercharged, the compressor will short cycle, instead of staying on till the thermostat tells it to disengage. I suspect your problem is in the compressor and that is where i would look first.