Cadillac Repair: No heat, cadillac deville, 1999 cadillac deville

Question
QUESTION: When you turn climate control down the air works and blows cold, but when you turn up there is no heat. I can't find if that would be a fuse or something else.

ANSWER: Not meaning to be rude, But I am not psychic. I need the YEAR_MODEL_ENGINE SIZE of the vehicle.

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QUESTION: It's a 1999 Cadillac Deville with a Northstar V-8.

Answer
Is the CHECK ENGINE light or any other light illuminated that should NOT be ?.

You most likely have a PROGRAMMER FAULT.

If you are mechanicaly inclined or know of someone who is, You will need simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.