Question about 2002 Jeep Grand Cherokee

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I had no heat but good AC. It went out on the right side first and now on both side. I was told it was probably a heater door/doors because this model was bad for this occurring. The dealer ship also told me this was the problem and wanted $1300 labor to repair. I can't afford that now due to financial reasons. I have taken the dash off and now looking at the heater box. I can I determine if the doors are broke.

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First make sure the coolant level is full, This is a common problem, but often the doors are ok but the actuators are bad. The actuator for the driver's side is not hard to get to,,, the passenger side is a bear since the whole case has to come out. Pull the drivers side actuator and move the door manually to check your heat. If you cannot afford to do both, at least drivers side will put some heat in the car.

Posted on Nov 14, 2009


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I have a 2008 Chevrolet Nubira 2L Diesel with air con problem. I am told it could be a blend door actuator. Could you let me know where this is or do you have a better idea. Thank you..rogerlines

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Good point. Solving it will probably take more time than money.
Thermostats and heater cores do not work one day and stop the next. If your engine warms up normally and doesn't overheat, the gauge reads normally, engine is at normal operating temperature after about 10-15 minutes ...all these point to a good thermostat. It is working right and should not be a problem.
To check the heater core, wait till engine is at normal operating temperature. Turn heat setting to high, then feel both heater hoses-both should be hot. If both are hot the core is circulating coolant and is not a problem. If only one is hot (which would be the inlet hose) the core is not circulating-could be an air block or the core is plugged up and will need replacing.
If heater core and thermostat are good, then it probably is the temperature blend door in the heater case. The door actuator is probably vacuum controlled. I don't know how difficult it is to troubleshoot on your Taurus, but check if vacuum controls are working right from the dash controls, check if the blend door is stuck, is broken, or if the vacuum control is working to open and close the blend door. When you want heat, the blend door should let blower air pass across the heater core.
From the engine you will have a single vacuum hose that goes through the firewall into the dash to the heater/AC controls. There, a pod like device can rout the vacuum signal to various doors on the heater case.
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1 Answer

I've replaced the water-pump,thermostat,heater-core and radiator,as well as the actuator. and still have no heat. it blows cold air. anyone have a solution?

No kidding. It's minus 26 right now in Montana where I am.
What actuator was that? The vacuum controlled doors are probably the problem. If both heater hoses are hot, coolant is circulating, and it must be a door in the heater case assembly not opening.
In this frigid weather, I would buy a hand vacuum pump and try all the little vacuum canisters around the case (under the dash) and see if you could find the door that gives heat out the vents, defroster, anywhere you can get some heat in the car. Get some heat, and diagnose fully when it warms up. A single vacuum line from the engine goes through the firewall into a podlike fixture, mounted probably below and to the right of the heater/ac control head. Probably electrically controlled, the pod delivers vacuum signals through several hoses to little canisters that operate the heater doors.

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Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

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1 Answer

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