The car should not overheat whether you use the heater or not. I would check the thermostat, flush the system if you did not. Better yet use a backwash system that power flushes the system out. Also make sure the cooling fans are coming on and that the radiator hoses have not collapsed.
My 2000 cadillac deville dts is overheating could the problem possible be a water control valve for the heater system?
Cadillac DTS
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Maintenance & Repair
my 2000 cadillac deville overheats could it cause by a defective heater water control valve?
Cadillac DTS
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Maintenance & Repair
My 08 Dts DeVille slightly over heated got antifreeze this morning and now it will not start. The engine is turning over and the check engine light is on.. help
2008 Cadillac DTS
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Maintenance & Repair
My 2009 DTS leaks midway in the trunk primarily on drivers side soaking the carpet and filling the spare tire well half full. I took it to Cadillac dealer for leak check and repair, they're leak exp...
2009 Cadillac DTS FWD
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Maintenance & Repair
They key is stuck in the ignition. What ever it is finally wont let the car turn over or stall, and finally drained the battery.
Cadillac DTS
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Maintenance & Repair
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