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Q:

heater problem on 2000 Cadillac DeVille

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
heat comes out only on passenger side cold air on drivers side
(1) Answer
It sounds as if you have a stuck air temperature door in your 2000 Cadillac Deville. Which ever side is not changing temperature would be the side with the fault. This can be confirmed by checking fault codes stored in the a/c control module using a scan tool. If it is confirmed that one of the temperature doors is not working, chances are it will need to be replaced. This type of fault has been listed as a common problem for the vehicle - http://repairpal.com/cadillac-deville-2000/problems