Question about 2008 Chevrolet Impala LT

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Foul odor out of vents when I turn heater on

Awful smell out of vents when heater is on. Nauseating

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Does it smell like mold, or gasoline, or what ?

Posted on Feb 11, 2014

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Posted on Jan 02, 2017

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SOURCE: When I turn the heater on burnt plastic smell from vents

It could be your heater blower motor or the blower speed regulating reisitor.
Try different blower speeds, see if the smell goes away. Also if one or more speed setting don't work, it is more than likely it is the resistor, if no to the tests, it is more likely to be the blower motor.
Also check to see if the blower intake is blocked.

Posted on Mar 02, 2010

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1 Answer

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Are you loosing radiator fluid. sometimes the heater core will rupture and you will smell burn odor. also check for strange rubbing sounds or screeching coming from the blower fan motor. or engine exhaust manifolds are hot when car is on, make sure nothing is leaning on them which will cause a burn odor. Any odor coming from outside will find it's way inside through the fresh air vents.

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Check for loss of coolant also. If you can see/smell oily deposits on windshield, it's unlikely it's from the a/c system as there is relatively little lubricant there. More likely your heater core is leaking and allowing coolant to be blown up onto the windshield. There will also be a distinctive odor with this.

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I have a 2002 taurus se and the fan belt broke, i replaced it and it broke again, i smell a foul odor coming from the vents


Check for a seized pulley

With the belt removed turn each pulley by hand, they should all move smoothly without barely noticeable play. I suspect that you may find the idler pulley is either locked in position or locks up occasionally. When turning the pulleys try putting some up or down pressure on them.

The smell you are detecting is most likely the smell of the burned belt. They do tend to give off a smell that keep on giving long after the bet is gone.

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If you run your Air cond on recirculate always try using an air sanitizer in your return vent. Or switch your A/C to outside air flow for for half an hour and raise the rear of your sunroof panel to vent the stale air do this till the smell dissipates and then close he sunroof and reset the A/C to recirculate if desired.

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1st, the fuse location is marked, what is the 20 Amp fuse for? 2nd, did the smoke have a nauseating sweet smell to it? If it smells like described it is the heater core leaking, coolant steam looks like smoke.

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