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daniel0269

Ac Odor When Changing Temperatures

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Hi all,

 

Sometimes when temperatures go down I switch to the white or red when I do that a horrible smell comes out. This only happens when the car is already running, and if I make the switch of temperature otherwise no odor will come out. Moreover, if I switch the temperature before the car starts the odor wont come out. Any thoughts of what might be causing this odor.

 

Any input is valuable thank you

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Possible that there is mold/mildew infesting your blower unit and internal A/C element. If the car sat for some time, possible some critters have made a home inside the blower, cowl area, any place up under the dash.

 

Since this happens when the car is running and you switch temperatures - means that this source of odor is coming from the blend door in the system. Need to do some additional investigating - start from the cowl, remove any debris you see, move to the cabin, especially around the blower assembly. No cabin air filter in this generation - so there are times where I find a bunch of debris in my blower assembly. I believe the blend door is on the passenger side - but it has been some time since I played around with that.

 

If everything looks clear - then you're left with pulling the rest of the duct work apart or using a spray deodorizer and hosing down the entire system.

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Last year my car navigated across a flood area the water was over my knees so I'm guessing that might have had something to do with it. The funny thing is my car survived without a problem while BMW, Mercedez Benz, and some newer cars were all being picked up ^.^

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Definitely. Pretty much have to pull everything apart, as any organic material you picked up in flood is festering somewhere in the car - mold mildew could be anywhere in there. You've pretty much got it isolated to the HVAC system - just depends on how much work you want to do.

 

Could just carry some of that HVAC deodorizing aerosols - most have a long flex tube that you can snake down into the ductwork - just hose the system repeatedly and hope for the best.

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