94 ZJ climate control always on even in the off position.
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Year: 1994
Model: Grand Cherokee (ZJ)
Engine: 5.2l
Hi all. My 94ZJ climate control (with the automatic temperature) is acting weird. It turns on by itself while it is in the off position when I start the car. I can still control the temp and flow speed, but it just won’t turn off. Besides resetting the PCM/ECU, not sure what else I can do other than disconnect the climate control module. Has anyone ever encountered this issue and found a solution? Thanks
UPDATE: haven’t managed to figure out what is wrong yet, but now the hvac won’t turn on at all. The fan does start when I turn the car on. I have discovered while tinkering with it, if I unplug the climate control unit and plug it back in while the car is running, it will turn on. I can even control the speed setting (though it takes a while to adjust) and the temperature (so no more ac randomly turning on in mid winter or heater in summer). As for direction, I can kind of control it though it often gives me the error message. I am thinking maybe it’s a bad capacitor or chip on the board? I’ve opened it up and I see no visible signs of damage. Has anyone ever experienced anything like this? Any advice would be much appreciated.
UPDATE: haven’t managed to figure out what is wrong yet, but now the hvac won’t turn on at all. The fan does start when I turn the car on. I have discovered while tinkering with it, if I unplug the climate control unit and plug it back in while the car is running, it will turn on. I can even control the speed setting (though it takes a while to adjust) and the temperature (so no more ac randomly turning on in mid winter or heater in summer). As for direction, I can kind of control it though it often gives me the error message. I am thinking maybe it’s a bad capacitor or chip on the board? I’ve opened it up and I see no visible signs of damage. Has anyone ever experienced anything like this? Any advice would be much appreciated.
Last edited by ZJ-94; Jan 31, 2023 at 05:37 PM. Reason: New update
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