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Cadillac Repair/1990 Cadillac Deville Fuel Gauge Displays "c"

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Expert: - 1/26/2011


Question
Hi. I have a 1990 Cadillac Deville. Recently, the display gauges for fuel and the temperature in the climate control center failed and began permanantly displaying only the letter "c". Now, when running the car, the interior blower goes on high, does not warm up, and I'm unable to make any changes to the climate control settings. I checked the fuses, everything looked fine there. Any help you can offer will be greatly appreciated. Thank you.

Answer
Hello,

Recently, I have been barraged with old car questions and I hold myself out as being pretty darn accurate, but to be perfectly honest, I do not remember the correction to problems such as yours.

What I would do if this were my car is get the factory manual with all the diagnostics. Besides, if you are keeping the car for any length of time, things are going to go wrong on a 21 year old car and either you can fix them, or you can share with your mechanic, who may not have this explicit information.

It's $30, but you download for a year and even in the diagnoses of your current problem, takes out all the guess work. http://www.alldata.com

You could spend hundreds and never find the factory manual for the car.

Good luck!

http://www.autotheftexpert.com

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Rob Painter

Expertise

Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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