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Help, 'c' and 'd' being displayed on ECC and FDC


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Hello all,

I am using my mothers 1991 Cadillac Deville while she is out of town. It runs ok, but every now and then the SES light pops up. Well last night and today the climate control has gone haywire. Both the FDC and ECC sit at either 'c' or 'd' (both on the same letter when being displayed) and I cannot retrieve any codes.

Occasionally it popped back into normal mode - but then the environment is set to off and at 24 degrees (celcius) with rear defrost on.

When it is in 'c' or 'd' mode the air is continually blowing and I cannot adjust it.

The car does run fine though.

Any help would be much appreciated.



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I had that happen on my 1989 deville turned out to be the bcm (body control module) was around 350 at the dealership if I remember correct

Good Luck


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