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Old 03-02-2015, 10:48 AM
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Burning smell, HVAC blower related - PROBLEM FOUND

Have had a problem the last couple of weeks with a burning odor inside the car especially noticeable when sitting at a stop light for an extended time. There is no burning odor when the HVAC system is completely shut down. With the system on either in auto mode or manual mode when the blower is operating and I just sit still (same as at a long stoplight) the burning odor appears. It is less noticeable when the fan speed is increased, as is when the car is motion, but I suspect that is only due to more air moving thru the cabin. I suspect it's blower motor or the resister pack setup that controls the blower motor, or possibly both. Other than the smell the HVAC works fine. I really haven't read much about this problem on WK's, but do recall the same type problem on the WJ's.

Anyone run into this problem before?

2005 Grand Cherokee Limited, 5.7L Auto HVAC controls
138,000 miles

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Old 03-02-2015, 04:24 PM
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Re: Burning smell, HVAC blower related

Problem found -

When this problem first showed up, I thought it smelled like something burning, but it had more of an oil odor vs. electrical. I checked best I could the valve covers, but it was too cold to get under the car the last two weeks. I pulled the cover off the engine, and found a small field mouse nest on the intake manifold, thought that was the problem, removed it, still had the smell. Then got on the trail of it possibly being the heater motor, but that didn't turn up anything.

Had a chance to visit my local mechanic shop this afternoon and put it on the lift. Found the passenger side valve cover leaking directly onto the exhaust pipe between the header and cat. Burns off fast that's why no oil leaking on the drive or garage floor. Its in the shop in the morning getting two new valve cover gaskets.
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