1991 Cadillac devill sedan. The letter c shows up on the climate control module. It turns off and works normal from time to time but how do I fix this?

SOURCE: Can not find the body control module on my 1989 cadillac sedan deville -- anyone know where it is?

you need to take glove box out. It's right behind three three 7mm bolts for the plastic piece that holds it in. two 10 mm nuts that hold it to the plastic piece. Should come right out with a little finessed force.

SOURCE: Fuel Data Center and Electronic Climate Control not funtioning

This is defenetly the BCM, I had a 1990 with all of the same problems. Buy a rebuilt and install it behind the clove box. Remember that you must install you memory prom into the new unit as they don't come with any in them (it is what is memorizing your miles driven.) You will get off pretty easy on this one as they are available and not too expensive.

Michael Thomas

• 3056 Answers
• Posted on Mar 07, 2009

SOURCE: electronic climate control and fuel data center not working

Hi there :
hey have you taken it to autozone and had them do a free diagnostics on the car then can tell u exactly what the problem is i am suspecting a computer issue

SOURCE: 1991 Buick Park Ave. climate control stopped

Check to make sure that you have enought freon to engage the compressor, then you will need a flow chart to take you through the rest of the steps necessary to diagnos this problem. The Electrical system manual for Buick is the only one that will have the proper information for you to walk through the steps to dead head it. There is a HVAC programer that is behind the floor heater duck work. It has a numbering system that goes from (2) rows of pins that go 1-16 for terminals.On terminal 5-7 with ignition in run position, you need bat. votage. Terminal 10 & 11 you need 4-5 volts. Neither 10 or 11 should be unplugged just yet since 10 feeds 11 pin. If there isn't any voltage at these pins, check for corrosion on the pins theirself, or for the pin that it may have slipped back out of the connector. Good luck.

Mark Carrington

• 192 Answers
• Posted on Apr 28, 2010

SOURCE: replacement sequence for serpentine belt for a 96 cadillac devill

Assuming you have the Northstar engine