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Old 05-31-2006, 12:46 PM   #1
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Default AC Problem on Park Avenue

'93 Park Ave. w/ Climate Control. The A/C is not working correctely. At times it cools just fine, then it will cut off. The control panel will not activate the "Auto" mode and when it'* pushed only the "Econ" will light up. If I disconnect the battery, it will work again, or if I wait a bit it seems to begin working again. The unit was evacuated and filled with 40 oz. of 134a, BUT it still seems to pull the guage down below 25psi to where the compressor cuts out.

Any thoughts?

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Old 05-31-2006, 01:22 PM   #2
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Sounds like low pressure is keeping the compressor from coming on. What other conversion things did you do when you switch from 12 to 134?

Have you tried jumpering the pressure switch on the accumulator to see if the compressor engages?
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Old 05-31-2006, 05:33 PM   #3
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Yes, I jumped the terminals and the compressor works fine. After a few minutes without the switch the lines to the evaporator begin to freeze up as they should. I'll try a few other things I've been advised of. I'm afraid it may be the control panel.
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Old 05-31-2006, 07:26 PM   #4
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If the lines froze up its low on refrigerant or the Ester oil was not added

Also did you add some Ester oil which is compatible with Residues of R12 as well as the R12 oil?

As well was was the total system requirement for R12?

Usually you add 8oz of ester oil then, you take the amount of R12 required for the system and devide that by 85% and that what you will need of the R134

I have done this to 2 cars and both still have the original compressors and still cool me down on a 90F day...

I am supprised that my 91 Bonnie has given me almost 16 years of cool air in the summer and the H6 Compressor is still not dead... I changed to R134 over 6 years ago

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Old 05-31-2006, 10:20 PM   #5
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When you cross the terminals on the pressure switch the lines will freeze up even when there is an adequate charge of refrigerant. The switch prevents the evaporator lines from gowing below 32 degrees and freezing.

I believe the problem is a very slow leak in the system. It'* worked well for 2 months now, and now that it'* getting hotter it'* beginning to show itself. I'll need to run the sniffer along the lines to see if I can detect the leak. I've not had much success on slow leaks with the dye stuff.
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