Question about 1998 Cadillac DeVille

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I have 1998 cadillac STS and the heater blows cold air only

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This problem is caused by a defective air temp control blend door motor, this door and actuator motor is located inside the dash between the heater core and the AC evaporator core, it shifts airflow through the heater core or the AC core or mixes or blends the two for the desired temp at the outlets, the motor will have to be replaced. This is a very common issue.

Posted on Jan 21, 2009

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cadman000
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SOURCE: 1998 caddy sts over heating and blowing cold air when heat is on

sounds like it might be low on coolant. Low coolant levels will stop the flow and circulation to the heater core, and also might be the cause of overheating

Posted on Apr 02, 2009

juncro
  • 467 Answers

SOURCE: 1998 Cadillac sts. The air conditioning blows

YOU HAVE ADD THE WRONG FREON ALL CARS MADE AFTER 1996 USES R/134. FLUSH THE SYSTEM, ALSO CHECK THE BLOWER FAN FOR DEBRIS

Posted on Jul 18, 2009

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I had mine replaced by a repair shop so I cant tell you how to replace it but it may be something that you can do if you have the time and patience to work on it.

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