I also have a 1994 camaro. Last summe the air worked fine. I thought that maybe I needed to re-charge it. I did, now the clutch isn't engaging. Do I need to buy a whole new compressor? or is there something else I might want to check?
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Re: AC not blowing cold air/ clutch not engaging
You might wanna check your a/c relay and make sure its good if that's fine you might just have to get another compressor also by a refrigerant with dye so you can make sure there's not a leak in your a/c lines
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Most likely the switch that is causing your trouble is located on the comp. behind the clutch assembly, In most instences the clutch Assembly will need replaced. The switch engages and disengages the clutch. Most of the time these can not be bought by them thelves.
Make sure that the tubing around the accumulator is getting cold.
If not, the refrigerant may not be charged up.
Otherwise, the vacuum motor for selecting cold air may be not working correctly causing heated air from the heater core to be routed to the interior of the car.
Do you hear the vacuum motors working when adjusting the heat to cold selector? or changing the thermostat temperature if so equipped?
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.
I had the same problem, turned out to be the alternator... there is a very sensitive element in the control module that prevents the A/C from engaging if it senses low voltage from the alternator. Do a complete check on the battery / alternator system. Unfortunately my problem has returned three years later - I think the Computer module finally died :(