A/C problem..I think it's the compressor - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-11-2006, 01:08 PM
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A/C problem..I think it's the compressor

I have a 2000 tahoe, and at idle it will start blowing hot air. I cools up when driving. I went, and bought freon with a gauge on it. It says the pressure should be 25-45 psi....the gauge says I have 98psi in there. Could the compressor be messed up leading to the rise in Freon pressure? At idle the cluth is not ingaged on the compressor.

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Old 08-11-2006, 01:26 PM
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Is the 98 psi with the engine running? You should be seeing the pressure drop until it reaches 32-35 psi on the low side then the compressor will cycle off, so on and so on. If you are seeing 98psi running I would say you have an overcharged system or the compressor is bad. Did you add freon?

Steve
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Old 08-11-2006, 01:29 PM
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No I was afraid to add freon. It was reading 98 PSI with the A/C on high, but the compressor clutch didn't appear to be on. Driving down the road it will cool down a little.
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Old 08-11-2006, 01:49 PM
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Does the A/c compressor cycle at all. Can you jump the low pressure switch to see if the compressor is working?

Steve
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Old 08-11-2006, 01:50 PM
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I'll try that in a little while.
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Old 08-11-2006, 01:59 PM
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Don't worry about what the pressure is until you have the compressor working.

Steve
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Old 08-11-2006, 03:50 PM
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I agree, the pressure readings do not mean squat if the compressor is not running.

Vince
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Old 08-19-2006, 11:54 AM
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Too much pressure. Period. Check the static pressure after the vehicle has been turned off for 10 minutes. It should be 50 max.

The over-pressure switch probably has the compressor locked off until driving down the road cools the system and makes the pressure drop into the safe zone.

You should check for a defective fan clutch not pulling enough air at low speeds.

I would remove all the freon and reinstall correctly. I recommend www.duracool.com which cools much better than 134 or 12 and is fully guaranteed in writing not to damage the system.

www.readershotrods.com see your ride?
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Old 08-24-2006, 04:45 AM
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Air in the system will increase pressure on both sides, whenever you top up and you find this has happened you should discharge, evacuate for an hour and refill. Add a little oil too.
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