Having problems with your 1989 Cadillac Sedan DeVille ?
Got an 1989 cady deville not getting good heat thermostat is ok but jts sending out cold air what else can i do
I had the same problem. Take off the radiator cap when the engine is cool, start the car and top it off. I still had liquid in the reservoir, so don't trust that a full reservoir means a full radiator. Two and a half gallons of water later, the heater started working again.
Heater core may be blocked u may have to disconnect and attach a garden hose back and forth at each end to free the blockage if your able or replace the core
Repair Help & Product Troubleshooting for 1989 Cadillac Sedan DeVille
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