Cadillac: 1991 cadillac code f40 (deville), f40, skill level

Question
hi..have an f40 code in computer...can u tell me what it means? thanks

Answer
F40 = Air mix door problem for heat and A/C system.

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 onlineautohelp@msn.com


In order for me to provide you with pictures, Instructions and electrical schematics (pictures).

PLEASE include your original question(s) and the MAKE-MODEL-YEAR and ENGINE SIZE of your vehicle when you contact me.

PLEASE tell me if you do your own repairs and or your skill level of auto repair. This is VERY VERY important if I am to be able to help you repair your own vehicle.