bad headgasket cause no heat?

Posted by 992GNTme, Feb 21, 2009
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  1. 992GNTme

    992GNTme Probationary Member

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    florence, Alabama
    Alright, so i got in my spare car the other day and i have had this problem the whole time i have owned this car. The car has over 200,000 miles. The car runs great no misfire of any sort but, it smokes when it is ideling and has no heat. It has little to no pressure on the radiator hose and sometimes when its hot outside will run hot. So my question is, can a bad heas gasket cause these few problems?:hmm: BTW the car is a 96 420a. Any help would be greatly appricated. thanks,Chris.
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  2. LKWTSI

    LKWTSI Proven Member

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    Lake Wylie, South_Carolina
    Sounds like you either have a air pocket locked in your cooling system or the Thermostat is jammed closed. Either situation can cause lack of hot coolant to go to your heater core and cause the hot temp on hot days.

    Start by replacing your thermostat and refreshing your coolant and see if that helps. beyond that it could be something wrong with your heater control and you can't tell until your certain you've got warm coolant going to it first.
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  3. knochgoon24

    knochgoon24 DSM Wiseman

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    Rochester Hills, Michigan
    Have you tried a new thermostat? The one in the car may be stuck closed.
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  4. 992GNTme

    992GNTme Probationary Member

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    florence, Alabama
    yeah i put a new thermostat in it. I also flushed the coolant, checked the climate controlls and all the fuses. I can't find anything wrong.:confused:
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  5. debbie

    debbie Proven Member

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    newcastle, Europe
    Could be a bad water pump. I had this on a bmw 3 series, when the car was idling the heaters blew cold but as soon as you revved the engine they blew hot, apparently it was a common problem so I lived with it.
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  6. 992GNTme

    992GNTme Probationary Member

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    florence, Alabama
    mine dosen't get hot at all though and the coolant is circulating fine.
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  7. loba

    loba Proven Member

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    Corvallis, Oregon
    +1 on the water pump. Head gasket can cause smoking, but it depends on what kind of smoking it is. It could also be a valve stem leaking oil into the combustion chamber, but if it's only on idle it could be running a little rich.
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  8. 992GNTme

    992GNTme Probationary Member

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    florence, Alabama
    it's definatly oil smoke but it also has a sort of sweet smell to it.
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  9. loba

    loba Proven Member

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    Corvallis, Oregon
    Sweet smell = antifreeze. The smoke looks very similar and often the scent is the dead giveaway.

    sounds like a bad head gasket.
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  10. duwackerTSi69

    duwackerTSi69 Proven Member

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    Jack Stands, Wisconsin
    If it was not for the smoke, I would just say the coolant could be low if any at all is left? My O1 Grand Am had low coolant and had no heat at all out of the vents.. Same thing with my old grand prix..
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  11. Locke

    Locke N/T DSM Wiseman

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    Houston, Texas
    Do a compression and/or leak-down test to prove or disprove the HG diagnosis.
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  12. 992GNTme

    992GNTme Probationary Member

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    florence, Alabama
    okay i will do that. thanks.
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