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The Jeep Grand Cherokee was redesigned for the 1999 model year; the 2000 models have minimal changes. This model is also known as Jeep WJ.

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Ac/heat not working properly

My 2002 Jeep Grand Cherokee heat and ac works but not blowing fast through vents just a slow stream on high could find anything in the box obstructing flow and blend door seems to be changing fan blows fast as it should what could be the problem?

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I had a similar problem in a Toyota! The foam seal around the damper flap had broken down making a sticky mess. So when I had the car running the AC during the summer I had plenty of air flow but when I switched to heat the flap wouldn’t open for the heat box! So the heat was just not getting through.

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If you are sure that you have all speeds, maybe 4 speeds, then I would think the blend door or mode door is not directing airflow to the correct place, seems to be bleeding air to different areas. Even if you see the blend door and mode door motor moving what seems to be full travel, the door itself may not be traveling all the way. Still could be obstructed also.

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You can feel it change different vents from the defrost to face to feet so should I look into replacing the blend door with the kit you cut the box?

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@jeepguy14 if your motor is running as it is supposed (make sure of that first) to and you are having airflow issues, you need to check the complete air duct system as well as mode door actuators and the blend door. Make sure that your air inlet is clean so no leaves or other debris may lower the initial air volume. You can test that by changing to recirculation and check if that is the same or if the air flow has changed. This can be pretty complex so I attached the distribution part of the FSM for your information.

Jeep Grand Cherokee Distribution

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