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.

Posted by gary_constab on

  • 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 
  • Anonymous 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

  • Anonymous Feb 22, 2009

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

  • Anonymous 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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    ====

    When the car is completely cool,check the electric fan(s) for smooth rotation.

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    ===

    Excavate air pocket in coolant system / check for head gasket leak

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    ===

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    ===

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    ===

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    ===
    Please post more information by clicking the comment link on the top right corner.

    DON'T FORGET to RATE ME if my tip is helpful to you!

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    Clean/check/change the thermo sensor,contact and wire.

    ===

    Excavate air pocket in coolant system / check for head gasket leak

    This test will kill two birds with one stone.

    ===

    MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

    RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

    You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

    ===

    Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

    Top of the coolant reserve tank

    Let it ran for 10-15 minutes.

    Monitor for air pockets escaping from coolant reserve tank.

    Small amount of bubbles is OK at 1-5 minute mark

    After the thermostat open up (after 195 F warm up) at
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    If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

    Give the thermostat host few gentle taps.

    If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

    Let engine cold down and top off coolant reserve tank.

    Start monitor for coolant lost

    ===

    A coolant flush is require every 2 years or 24,000 miles.

    I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

    Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

    ===
    Please post more information by clicking the comment link on the top right corner.

    DON'T FORGET to RATE ME if my tip is helpful to you!

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