Question about 2002 Jeep Grand Cherokee

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Heater blows cold on low revs

A bit warmer on higher revs

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  • kewellnum10 Jan 06, 2009

    thanks but how u check rad plz

  • kewellnum10 Jan 06, 2009

    also holding tank not getting very hot



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Check your coolant (antifreeze)level!
,not just in the holding tank,but the radiator also!!

Posted on Jan 06, 2009

  • laz lan Jan 10, 2009

    the holding tank will get warm much later than the radiator.

    heres a "test",

    -when engine is HOT,

    1)while it's idling,touch big black hose on top ,in front of fan(i think it's on the right,or drivers side),it should be hot!

    2)on the pasenger side of car at rear of engine you should see two black hoses about 1" in diameter,these will be your heater hoses,they should also be hot!

    if ANY of the two checks arent hot,you have some repairing to do!!

    the heater may have a bad "heater valve",very cheap and easy to replace.

    OR you may once again have low coolant.

    if your radiater does NOT have a "hidden cap"-on top of it,then i would check to see if the hose from the resevoir tank (big one)isnt plugged.

    one way or another,you MUST have hot coolant going to the heater core to get heat in the car!!

    finally,does the temp gauge on the dash read cold?,or hot?

    -if it does,the thermostat may be bad ,OR,the water pump went bad(loose impeller)

    hope this helps!



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