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Does it smell like dirty socks?
 

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You do need a new cabin air filter, but you may also have mold and/or mildew growing in the HVAC system. A lot of smaller cars get this. To solve this you have two choices - one, have your dealership use the GM kit to clean the system and verify the drain isn't clogged, or two, using lots of Lysol spray to kill this stuff, turn on the HVAC blower in fresh air mode and spray into the main air intake just in front of the windshield on the driver's side. In either case, you may want to take your car into a Chevy dealership and pay them to turn on the afterblow feature in the HVAC system. Afterblow runs whenever you've used the A/C and it works by running the blower three or four times every 10 minutes or so after turning the car off. It change the air intake from cabin to external and fires up the blower on high sucking in fresh air to help dry out the system. My dealership warned me that afterblow could cause a bad battery to drain sufficiently that the car won't start, but seeing that I'm at 80K miles and 4 years on my battery and this has been turned on for nearly three years now I don't think that's as big an issue as my dealership made it out to be.

The cabin air filter is behind the glovebox. The hardest part of changing it is getting all the junk back in the glovebox. I'd recommend you vacuum out the opening before putting a new one in. Also, you can spray the Lysol in there while running the blower to provide a second entry point.
 

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I had the afterblow turned on on my old eco, its doesn't work at all...Just makes the car more hot and smelly
Did you have the HVAC system cleaned as well? Your situation sounds like the HVAC drain is clogged.
 

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How much would it be for the whole GM kit thing, or do you think spraying Lysol into the intake while cranking the fresh air setting would work just as well? Also, how much generally would I be looking at for a new cabin air filter to be installed or is it relatively easy to do myself and I'd just buy the ~$20 part?
I have no idea on the cost for the GM kit - my car was done under the B2B warranty.
 

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Went and sprayed some Glade (all I had at the moment) into the driver-side air intake while fresh air was cranked full blast. Can't tell as of now but it did seem to help initially so hopefully that will help.

My dad has an industrial air compressor or something in our garage he said I may not need to replace the cabin air filter immediatley, I could just take it out and blow the piss out of it with that air compressor so maybe I'll wait on the air filter replacement.
You might as well change the cabin air filter and put an activated charcoal filter in there. It should be done annually anyway - mine's coming up this spring after road salt season.
 
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