Question about 1993 Jeep Grand Cherokee

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Heater blows cold air

I have a 1998 Jeep Grand Cherokee, and the heater only blows cold air the fan controls work fine, and the temp gauge reads normal, the hoses get hot also. What could be the problem?

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  • capps57 Feb 17, 2009

    It has a new thermostat in it

  • capps57 Feb 18, 2009

    yes please

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If the "Heater In Hose" gets hot, and the "Heater Out Hose" does not get hot, than either the Control Valve is sticking closed, or your heater core is plugged up with ****!

Have you used "Barrs Leak" or a simular product for a radiator leak? That will sometimes clog the heater core.

I have a 1993 Grand Cherokee, which "Normally" throws very hot air out of the heater, but lately sometimes it only throws warm air, till I make my first stop, than it gets hot.....all because the heat control valve is hanging up.

Low water in the radiator will also cause a heater to not work.....if the water level is too low to circulate to the heater.

XRM

Posted on Feb 18, 2009

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Troubleshoot this as a "blend door" problem. Google: Jeep heater blend door repair youtube

Posted on Aug 14, 2015

  • Anonymous Aug 15, 2015

    why guess. tests are first. not guessing.

  • Anonymous Aug 15, 2015

    2009 posts.

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You need a new thermostat

Posted on Feb 17, 2009

  • Stephen Davids Feb 18, 2009

    sounds like your heater core is plugged up.
    would you like to know the steps to cleaning it?

  • Stephen Davids Feb 19, 2009

    first pop the hood, look toward the firewall( wall closest to the windshield) there should be two hoses about 2-4 inchen away from each other. one of the hoses will go to the radiator. unhook the hoses from the firewall connection. you should leave the one hose connected to the radiator so you can kink it and not loose all your coolant. next you should have both spouts protruding from your firewall. take a hose and blast through one side and watch as all the gunk pores out.
    make sure you run the water through it for about 5 minutes or until clean water shows.


    the two spouts protruding are only input and output of a smaller radiator in your air duct.
    after you connect the hoses back let the vehicle warm up, turn it off then check the coolant level. add necessary amount.

    we would like to know if this helped, so please let us know. or if it doesn't help we'd like to know, so we can narrow it down and help you


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