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120 PSI on Low-Side of AC -- What to do? 850 1995

posted by  someone claiming to be Dave on  Tue Jun 4 06:14 CST 2002 [RELATED]

Thanks Chris and everyone. Responding to Chris' questions, I did not take a pressure reading on the low side before turning the car and A/C on. I'll do that to see if it is different or what it is. What I did was turned the car on and ran the compressor for 3-4 minutes then took the pressure reading while both were still running. Ambient outside temperatures were in the mid-70's and the car had been not been used for some time before taking the pressure reading. I may have done something wrong with the wiring to get the compressor to run. I disconnected what I think is the low-side pressure sensor -- the two single-prong connectors that clip to the outside of the compressor casing near the low side. I thought these were the wires to "jump" that I've seen described in threads in this forum to get the compressor to run. Am I right in this or are there other wires I need to jump to get the compressor to run? Could I be getting the high PSI because I by-passed the sensor?

So, what you're saying I need to do now is:
1) I need to take a pressure reading with the engine and compressor OFF;
2) Then take a second reading after turning both the engine and compressor ON;
3) If the pressure reading is low (below acceptable range), then charge it;
4) If the pressure reading is high or above the acceptable range, then I've got some other, major problem --- a bad compressor. Is this right?

Since I haven't had the A/C worked on or done anything to it myself, I don't think I'm getting the 120 PSI reading because it's overcharged. The A/C worked last season -- so this was a totally new problem.

I really appreciate your thoughtful consideration, and if you can't tell, I don't have a clue about any of this so please feel free to explain in detail.

Thanks - Dave





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