1990 Cadillac El Dorado Air Conditioning Sensor

Air Conditioning problem
1990 Cadillac El Dorado 100, 00 miles

The light came on saying that the compressor was off due to low freon. The repair man said there was ample freon in the compressor - that the problem was the sensor. He unhooked the battery and rehooked the battery which set the sensor for now. But I remember reading on the Internet that there was a different way to reset the sensor when it showed no freon in the compressor (when there was plenty of freon in it). Can't remember where I saw it. Can you tell me how to do it? Thank you. Myrna Theofanis
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Monday, November 1st, 2010 AT 2:59 PM

1 Reply

The only thing that comes to mind is entering on-board diagnostics and clearing codes. I will try and give you the info off the top of my head, I have no information on the system with me. Start with the key on, press 'OFF', and 'Warmer' on the climate panel for a few seconds. What you should see on the info display is codes(if any) for each sub-system. The A/C codes on this are prefixed ACP, I think. It could be ACM, or if there is nothing listed with an 'A', it is BCM codes. After all codes display, the info center reads ECM. If you press fan down, it should scroll modules(BCM, SIR, etc.). Fan up will select. Either choose AXX module or BCM, and press fan up. From there you should see another sub-menu, and by pressing the fan down button you can get the 'clear codes' command, and press fan up again. It should clear them, and the compressor should come back to operation.
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Monday, November 1st, 2010 AT 10:02 PM

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