Cadillac Repair: AC/Heater is not blowing, cadillac deville, decent answer

Question
QUESTION: What could be the problem if my fans are not blowibg out cold or hot air? Also, I have to be driving in order for the defrost to work half way decent.

ANSWER: I need the YEAR and MODEL of your vehicle.

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QUESTION: Its a 1999 cadillac deville.

Answer
When you say FANS, Are you referring to the fan motors for the front inside compartment and the rear inside compartment fans are not working ?.

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