Question about 1997 Jeep Grand Cherokee

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Heater doesn't work. it's like the thermostate will not go from cold to hot. Stuck on cold!!!

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  • Richard Scordino Nov 05, 2010

    Your thermostat should open at 195 degrees (f) If it does not, replace it. However it can also get stuck open. In that case the engine won't reach operating temperature. If you remove the thermostat from a cold engine it should be closed. If not, replace it. Otherwise, if everything there is good, the problem is in either the heater control valve (if you have on it's on the heater hoses just before they enter the firewall), or under the dashboard, problem either with control or a blend door/motor.

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The blend door under the dash is intermittently not working and/or stuck in a closed or open position. You will have to get under the dash and check the blend door for sticking or a defective actuator.

Posted on Nov 06, 2010

  • Richard Scordino Nov 06, 2010

    I know my eyesight isn't what it used to be but I don't think anyone can see your vehicle and do the necessary checking and testing needed to correctly diagnose the problem on line.
    I recommend that everything be checked over. In a shop environment, I'd recommend that my techs look at it, therefore not making a random guess. In your situation, you need to do the looking or have a shop look, then you do the work....your option.

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