Question about 2004 Chevrolet TrailBlazer

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Musty nasty smell comming from vents in my 2004 trailblazer.

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GET WYNNS PRODUCTS PART # 62801 OR # 16101 SPRAY IN VENT TO KILL MOLD IN SYSTEM. CAN ORDER FROM INTERNET. MOLD IS CAUSING SMELLS.

Posted on Dec 29, 2010

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I have a 2001 ford focus. While cleaning out the engin compartment i found a mouse nest in the air conditioner intake under the windsheild. i cleaned it out, but now there is a smell that comes from the...


HI, you can check with your local parts supplier ( Napa, Advance, Auto Zone, ect). There are numerous products out that help get rid of the musty moldy smell that happens in the A/C systems. These products are sprayed into the evaporator cases either through a small opening or a drilled hole. If this doesn't help that wonderful little mouse may have found his way into the case and not made it out and then you will have to the case removed and cleaned out. good luck

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My 2003 TrailBlazer has a foul smell from the air system. What could be causing this smell? It's a sour smell not a dead animal smell. Is there a cabin air filter? I've read several posts and some say...


you can buy a deoderiser that kills all known airborn nasties,you spray it into the air inlet of any aircon unit,the only smell that it will NOT get rid of is cigarette smoke.that sticks to the filter/condenser and all the vents...nasty.

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The heater has a musty smell,I suspect i need to


It sounds to me if you are having a "musty smell" then you might have a problem with your condensation drain line for you a/c system or a small leak on your heater core. If it is plugged then water will collect in the vent system causing a musty smell from the water not draining and if there is a small leak on the heater core then coolant can collect in the vent system. I would run the a/c on a warm day and look for water draining from the vehicle around where the dash is located to check the drain line. As far as your air cabin filter most are located behind the glove box. You usually need to remove the glove box to get to the filter.

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Bad smell from a/c


Do you leave your climate control in the Auto position. This is bad. What happens is the evaporator which is located in the vents never dries out and you begin to grow mold. Does it smell musty, locker room type smell.
Also since it came out the heat vent it could also be a leaking heater core. Check you coolant level and reservior. If low this is an indication heater core is leaking. It may not of leaked enough to tell but usually these are the only reason the vents would smell unless a rodent ended up there and died.

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