I have a 1992 cadillac deville that I just purchased. The digital control for the heater and the gas gauge are not working. The person I purchased it from said they had the ignition switch changed and after it came back from the repair shop they didn't work. how do I fix it?
I had the same problem in my 91 deville but the fuel gauge was intermittent at first, working most of the time then eventually it quit working all together, i also replaced my ignition switch thinking that was the issue but what actually happened is the fuel gauge shorted out the 16 volt supply from the bcm (body control module) which also feeds the ac and in my case the digital speedometer. your speedo probably isnt digital, but if you unplug the fuel gauge from the harness your ac gauge should come back on or vise versus unplug your ac and the fuel gauge should come back on right now im trying to locate fuel gauge. i hope this info is helpful to you, all you need to remove the gauge is 1/4 inch drive rachet and 7mm socket and a phillips screwdriver (#1) for the trim
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