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Old 07-06-2014, 12:21 PM
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HVAC blower cycling on and off automatically

Hi,
New to the Jeep Garage, and I'm currently searching for any information relating to the HVAC blower motor continuously cycling on for approx. 50 seconds, then off for approx. 25 seconds when the HVAC system is turned on/running. This does not occur when the system is off.

Bought our 2011 WK2 Grand Cherokee Laredo used, and recently found pieces of the actuator gear on the passenger floor. Actuator and cam/gear on order, glove box and silencer removed.

HVAC was working until this week, checked/charged R134a, it works, driver side A/C & Heat controls work, passenger side controls get no response, so will be fixing that when parts arrive.

I'm not sure if these two issues are related in any way, but I'd like to troubleshoot and diagnose this problem while I've got it taken apart, so any insight or help would be appreciated.

Thanks,
Mpadrino27 (Mike)
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Old 07-07-2014, 06:41 AM
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Re: HVAC blower cycling on and off

Sounds like the sacraficial plastic gear shattered that is part of the passenger temperature blend door actuator. Simple fix if so. Your actuator should be fine.

Short version: when the actuator does a sweep, it's travel is out of range. Hvac lets you know by toying with the fan.
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Old 07-07-2014, 11:46 AM
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Re: HVAC blower cycling on and off

I believe there is a diagram floating around, part#, along with repair instructions. Do a Google search and it should come up. Good luck.
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Old 07-28-2014, 11:26 AM
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Re: HVAC blower cycling on and off

@Ratchet - Thanks for the info. Finally got it changed, and once the gear was seated properly within the specified range of travel, motor started working properly. Added a bit of freon while I was at it, and now passengers turn to ice cubes.

@DKRD12 - Thanks. Found the diagram and repair info., which made the repair much easier. At $3 a pop, I ordered a few extra gears, just in case.

Appreciate the info. Thanks!

Mpadrino27
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