Question about Cadillac DeVille
It blows warm on low fan but any other fan speed its ice cold
If water temp ok sounds like not enough hot water getting to heater core maybe cooling system flush will help
Posted on Jan 04, 2014
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Posted on Jan 02, 2017
How cold is it there and does your engine cool down any while going slow? If it does it may mean you need a hotter thermostat installed, My first thought would be to check the coolant level in the radiator and the coolant reservoir! Hope this helps and Merry Christmas
Posted on Dec 23, 2008
the most probabale cause of this would be a disfunctional hear core if you replace your heater your heater will more than likley work the the way it's supposed to
Posted on Jan 18, 2009
Your problem is the air temp control blend door actuator is defective and not controlling temp u set. to change/access this part the dash assembly must be removed from the car.
Posted on Mar 24, 2009
I worked at a Nissan dealer for 18 months and we'd get a lot of these in. The cold heat at idle is accompanied by a sloshing noise from behind the dash - you've got an air pocket in the heater core. What we used to do was lift the front end of the car about 3 feet off the ground using the hoist and take the rad cap off. Then we'd run the engine at a fast idle (jam a screwdiver against the throttle stop to hold it fast or put a slight weight on the pedal if it's Electronic Throttle Body. Run the heater on full heat and the engine like this. You'll see the rad 'burping' as the air in the cooling system travelling to the highest point it can - the open rad cap. Top up with a 50/50 mix of coolant and water as you go. When it burps no more, you have a full cooling system and should not suffer any more "cold heat".
If you do this yourself, PLEASE use jack stands, block the back wheels and put the parking brake on!!!
answer from a Nissan mechanic, (not me)
Posted on Dec 31, 2009
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