Question about 1999 Mercury Sable

3 Answers

Heater doesn't work

I have a 1997 mercury sable. The heater blows only cold air. I have the same problem. Ford repair shop replaced the heater core 2 years ago and it cost $900 to have done. The dashboard had to be removed in the process and we were told that this was not a do it yourself job. Could this be it again??? My car is a '99 model.

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  • burt7376 Dec 21, 2008

    I don't know about the hose temp in and out, I will check that. At times I do smell coolant.

  • burt7376 Dec 21, 2008

    The thermostat has already been replaced.

  • burt7376 Dec 21, 2008

    Clarification: We don't think the heater core leaks. There may be a small leak in the reserve coolant tank. The amount leaking is a very small amount. The car never overheats.



  • burt7376 Dec 22, 2008

    Response to questions: No, the heater core doesn't leak. The hoses leaving the heater core, one is hot while the other is just slightly warm. On occasion you can smell coolant.

  • rintin123123 Dec 24, 2008

    96 mercury sable drain plug coolint

  • wiggachic Jan 12, 2009

    my temp gage fluctuates from cold to half way between cold and hot. I smell coolant from time to time, every now and then the heater blows out cool air but my car has not overheated. I just within the past month had the radiator replaced and the thermostat replaced twice since august of 2007. Could the problem be the thermostat? (again?) Someone suggested it was the thermostat sticking.

  • yadayada
    yadayada May 11, 2010

    U didn't answer my questions, if u want help please provide the info I requested.

  • yadayada
    yadayada May 11, 2010

    does the heater core leak? do the coolant hoses get hot in and out of the heater core? do u smell coolant?

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This happens ALL THE TIME!! Heater core is likely plugged with rust, yes. but a garden hose fix will NOT last. and the reserve probably IS cracked on bottom, as most are.They are relatively cheap from Ford, though. Have a REPUTABLE radiator shop do a Genuine Power Flush to the entire cooling system (not an automated fluid exchange many shops claim to be a "flush") and THEN have them unplug the heater in a similar fasion. Now is the time to replace the surge tank (old one is packed with rusty sediment that is usually partially plugging the cracks in it, and not very cost effective to clean anyway). On older, very rusty 2 valve 3.0 systems only other issues are the rear of timing cover gasket often leaks a little, and the water pump impellers can become eroded away (from rust) and water flow suffers. So... watch for residue or dripping from behind water pump. If minimal, a mild leak sealant added to a properly cleaned system with refill and tightening the bolts near leak will do the trick--otherwise timing cover gasket and pump replacement is needed.

Posted on Jan 01, 2009

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The heater core sounds like it is plugged with rust, disconnect the hoses to it and use a garden hose to flush it out, in most case this will restore the flow.

Posted on Dec 22, 2008

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  • Master
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No. try changing your thermostat. thermostat and gasket ill be less than $10

Posted on Dec 21, 2008

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