Question about 2003 Cadillac Deville
Not defrosting or blowing out heat.
To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.This will help.Thanks.
Posted on Feb 18, 2012
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Posted on Jan 02, 2017
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
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Posted on Jan 22, 2009
I'm pretty sure the door that directs the air between the defroster and front vents is vacuum actuated. Check the vacuum lines in the engine compartment that go to the firewall. Find an approx 1/4" rubber hose that goes into the firewall around the center of the firewall and trace it back to the motor and make sure it hasn't come loose.
If not that, then it may have come loose at the a/c control panel. That will be much more difficult to get at to check. You may be able to access it through the front of the dash.
Posted on Jun 19, 2009
check the heater control valve. sounds to me like the dash control unit that opens and closes the vents may not be functioning properly
Posted on Dec 07, 2009
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