I have a 1998 Jeep Grand Cherokee Laredo with no heat. This is a bad situation in Minnesota in December. The fan works fine. This vehicle has the simple single temperature control (not the fancy separate driver/passenger). I can make the air even colder by twisting the control. This makes me th…

Do you have a heat gauge? Does it rise as the engine warms up? If it isn’t going up, or not much, you have a faulty thermostat and need a new one. If the engine warms up, but the heater doesn’t, then you probably have air in the heater core and it needs to be bled out. I don’t know how the Jeep h…

When the engine is fully warmed up, grab the heater hoses and see if they feel warm or not. If they are both warm, fluid is circulating through the heater core-maybe not as much as you need, but probably a door not opening if both are hot. If the inlet is hot and the outlet cold, its not getting t…

Back to the blend door… Both heater hoses are warm. Coolant level was very low so I fixed that and the gurgling/water rushing noise has stopped. I did not air bleed, but as both hoses are warm that doesn’t seem to be the issue. I think my next move is to pull the glove box and check the blend doo…

Flushing the heater core seems to have done the trick. On my vehicle the blend door motor is not behind the glove box, but is near the floor just above the transmission tunnel. We could see the actuator turning when the temperature was adjusted. It was always possible to make the air colder. Some…

The Grand Cherokee has a common problem with the blend doors breaking and this is most likely the problem that you are seeing. You can read the HVAC codes from the center panel without any special equipment and get a definitive diagnosis. Unfortunately, this is an expensive repair from the dealer.…

How to diagnose Jeep Grand Cherokee heater problem

Maintenance/Repairs

stevzie December 18, 2009, 4:38am 3

The engine does warm up. I’m beginning to have hope this is as simple as adding coolant and air bleeding. Thanks.

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How to diagnose Jeep Grand Cherokee heater problem

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