1993 Cadillac Deville heater system

Tiny
RAYMOND RICHARDSON
  • MEMBER
  • 1993 CADILLAC DEVILLE
  • 4.9L
  • V8
  • FWD
  • AUTOMATIC
  • 180,000 MILES
Can't get the heat in the car it get's cold but not hot
Thursday, October 30th, 2014 AT 9:32 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are both hot, the heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.
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Thursday, October 30th, 2014 AT 12:45 PM

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