Question about 1995 Cadillac DeVille

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Engine running hot displays on dash....cold air blowing thru vent

1995 cadillac sedan deville....radiator full.....coolant in reservoir tank...just replaced thermostat and flushed system 4 mos ago..right before it started blowing cold air I thought I smelled a faint burning odor and I heard a clicking noise that seemed to be coming from the firewall area behind the vent or radio. Coolant repeatedly leaks behind the reservoir tank but no one can find the leak.

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  • gary_constab Feb 22, 2009

    Can you elaborate...unfamiliar with the air trap...thanks

  • gary_constab Feb 22, 2009

    All 3

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  • 366 Answers

There,s a chance that your hot-cold air trap is not working

Posted on Feb 22, 2009

  • 1 more comment 
  • carhob Feb 22, 2009

    there is a trap door that diverts air thrue the heater core,wich control hot and cold for your heat in car

  • carhob Feb 22, 2009

    is your problem car is running hot or cold air only from heater or coolant loss or all 3

  • carhob Feb 23, 2009

    theres a chance thermostat is not working or was installed reverse by mistake,car over heats coolant will leak from reservoir over flow,could also cause no heat in car.

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How do you open the moist cap? i want yo fill it with water but it wont open


What is this cap on?? Radiator or windshield washer reservoir? Something else?

If the radiator, most newer cars have a plastic bottle or tank that has a "cold" and "hot" level indicated. You should be able to see the coolant level thru the tank. You should NOT need to open the radiator cap if your car has this tank. Add a 50/50 mixture of water and coolant (of a type your car requires) up to the "cold" mark and start the car. Let it run with the heater set to HOT and fan set to HIGH. Continue adding the 50/50 mixture to maintain the coolant level to the HOT level mark on the tank as needed with the engine running. Stop when there is HOT air blowing out of the heater.

If your car does NOT have this tank, you may only open the radiator directly when the engine is COLD. Wait several hours for the engine to cool after shutting off before attempting to remove the cap.

When cold, press DOWN on the cap WHILE turning. Most caps will come off after a 1/4 to a 1/2 turn. Start the engine and set heater HOT and fan to HIGH. Continue to add a 50/50 mixture of coolant to the radiator until the heater blows HOT air. The coolant level in the radiator should be just under (1" or less) from the bottom of the radiator opening.

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Yes it would overheat without circulation, but the coolant doesn't circulate through the overflow tank. That reservoir only gets coolant into it when the coolant gets hot and expands and pushes the radiator cap seal up to let coolant into the reservoir. When the vehicle cools down, the coolant contracts and the lower level in the radiator will siphon the coolant out of the reservoir back into the radiator. Coolant circulation is from the engine to the radiator and back into the engine...and also through the heater core.
You may have an air block in the heater core. Check by taking off the outlet hose at the firewall or at the engine and see if you have a slow steady stream of coolant, with the engine running and heater controls on high heat. If it was an air block, a steady stream should quickly start. If you get little or no flow, the core may be plugged and need flushing backward or replaced.

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How do you know it gets hot? Are you going by the temperature gauge on the dash? Or have you checked under the hood and found out the engine really is running hot? ...Reason I ask is, something just doesn't sound right in your description. After just 5 minutes from starting and driving away, the engine would not yet be at normal operating temperature. That would explain the heater not yet warm. But the temp. gauge says hot?
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1 Answer

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  • 2

    Fill the overflow/coolant reservoir with the same 50/50 mixture.

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    Put the radiator cap back on.


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