Question about 1994 Buick Regal Gran Sport

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A/C starting cutting out after i replaced the compressor, it was working fine and then the air started cutting in and out now it just puts out hot air. Thinking it could be the relay switch or something else. Open for suggestions.

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Did you vacuum the system when you replaced the compressor?? sounds like you have air and non condensibles in the refrigerant system.

Posted on Jun 02, 2009

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sounds like you have a pressure switch sticking or has failed .

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I'd start off with replacing Air Charge temperature sensor, make sure your AC Hose isnt leaking anywhere, if those dont solve it then replace ur AC clutch, last chance would be replacing AC compressor. sometimes the compressor will malfunction randomly. or the AC clutch might malfunction aswell. covering these steps somewhere along the line you will have working AC again! good luck

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1999 gmc Jimmy only Blows hot air. Diverter actuator is moving and working. Even when compressor starts all pipes are hot. Check 134A and was low. When put in less than a can the compressor would cycle on...


When recharging the ac you need to recover the old refridgerent. That means you have to take out all the old 134 and replace with new 134. On the engine sticker under the hood should tell you how many pounds of 134 it takes. When put in the 134 make sure your ac is on high.

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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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Put a new belt on it and spray the condenser coil in front of the radiator with a hose when it gets up to temp or the sound starts and see if it stops. Thats what I did today. Flapping/clacking stops for about 10 minutes until thing get hot again.A/C blowing cold air the entire time.

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If you still have freon in it you can try a new low pressure switch. You should find it around the oblong tank. You can unplug the switch and jump the plug to see if the clutch engages. Moderation is the key. Put in the correct ounces of Freon and the system should cycle. Too much freon it will cut out-too little it will cut out. You want the pipes to sweat or frost and the compressor to go off and on. Also be sure you put in an oil charge for that new compressor.

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1 Answer

Ac compressor does not turn on when car has been sitting & it's hot outside. Works fine in the morning.


either the freon charge is about 1/3 low, or the expansion valve needs to be replaced. Freon is getting into the evaporator, but not in great enough volume to cool the air unless it is coming in cool to start with. check your ac charge, and if it is full, then have it emptied, change out the expansion valve, and recharge it

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