Quote:
Originally Posted by DNP
I have a 1994 buick lesabre with dual climate control digital.The ac system is in good shape.But i have to take battery cables off witch resets the computor.This will reingage the ac pump.It does not last.If it sits over night same problem.Anybody know whats the problem? No check engine light car runs great.No power to the pump wiwth out removeing the battery cables and resetting computor.?
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When you start the car, does the temp readout start flashing for 90 seconds? That means the unit has detected a fault. I believe 1994 cars can NOT read out the error on the AC unit; it requires a TECH II type reader.
The most common fault is low freon pressure. My car has a 1995 unit in it (it's a 1998). The programmer has always turned on the error flash during cold weather. Unit operates fine. I just replaced the programmer because of the problem with the vacuum line connector in the corner of the box and I did something wrong testing the box, so I got a new replacement at a local wrecking yard.
The AC compressor is turned off below 50 deg or so. I believe that's based on the temperature ambient reading for the HVAC unit. Today it was 12 for the low here and the high is 26. You're not going to get to test your unit for a while.
Does yours still have the low pressure switch in the line close to the accumulator on the firewall? When it's warmer, you might bypass that switch to be sure that it is telling the unit there's enough freon. And has the freon been recharged? I assume that is R134a...