Cadillac Repair: No heat, radiator cap, radiator

Question
My 1999 deville has no heat. It blows cold air

Answer
Both the drivers side and the passengers side blow COLD air ?.

If they deo, First check to make sure that the anti-freeze in the radiator is at the FULL mark when the engine is at normal operating temperature.

Use CAUTION when removing the radiator cap as HOT anti-freeze can be expelled from the radiator when you remove the radiator cap.