Heat selector control knob
01-24-2012, 01:32 PM
#1
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Model: Cherokee
Engine: 6 cy
Heat selector control ****
When I select heat to go to the floor, dash, or defrost everything works fine. When I select floor-defrost my RPMs fluctuates when I'm sitting at a stop light or if i'm in the parking lot with it still in park. Sorry for the crappy picture.
01-24-2012, 04:37 PM
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Year: 1993
Model: Grand Cherokee
Engine: 4.0L Laredo
I'd check the lines behind the control. Aside from the AC kickin' on as stated above, a cracked/loose vacuum line at the selector could affect the idle.
01-24-2012, 09:33 PM
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Yes it only happens when it is selected to floor-defrost, heat. I havent tried it with the a/c on. Should I try the a/c to see if it does the same?
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01-25-2012, 09:05 AM
#8
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Year: 1998
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Engine: 4.0L HO
Compressor is on in 5 selector positions (yellow circles). If refrigerant is low, the compressor will cycle on/off. Compressor on places a load on the motor (rpm drop slightly), compressor off, rpm rises slightly.
01-26-2012, 07:10 PM
#9
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Thanks. I buy on of those recharge kits and try to recharge the system.
01-27-2012, 07:36 AM
#11
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it is normal to hear the a/c pump kick on and off if the selector is in any a/c mode whether you have the temp on hot or cold.
the a/c pump also kicks on and off when the selector is on the windshield defrost so the pump gets oiled during the off season (winter).
don't just go out and get a recharge kit to recharge it. if it doesn't need it, you can overcharge it and cause damage.
the a/c pump also kicks on and off when the selector is on the windshield defrost so the pump gets oiled during the off season (winter).
don't just go out and get a recharge kit to recharge it. if it doesn't need it, you can overcharge it and cause damage.
01-27-2012, 12:06 PM
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it is normal to hear the a/c pump kick on and off if the selector is in any a/c mode whether you have the temp on hot or cold.
the a/c pump also kicks on and off when the selector is on the windshield defrost so the pump gets oiled during the off season (winter).
don't just go out and get a recharge kit to recharge it. if it doesn't need it, you can overcharge it and cause damage.
the a/c pump also kicks on and off when the selector is on the windshield defrost so the pump gets oiled during the off season (winter).
don't just go out and get a recharge kit to recharge it. if it doesn't need it, you can overcharge it and cause damage.
01-27-2012, 12:09 PM
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Year: 1989 xj sport 2dr
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yes its normal unless ac is on high coldest temp settiong it should not cycle on and off quickly ,but it will cycle on and off when temp gets cold
01-27-2012, 12:11 PM
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01-27-2012, 05:47 PM
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Model: Cherokee
Engine: 6 cy