Air conditioner My air conditioner has a mildew smell. I've put it in the shop 2 times and no one seems to be able to figure it out. Where do I find all the air filters? I know this is the smell problem. Linda Martindale 870-557-0697

There is a procedure for this condition. GM says to flush the core with a cleaning agent they sale. I have found Lysol Fresh scent does a much better job of curing the condition.Spray the Lysol in the outside air intake vent while the vehicle is running with it set to max a/c and fan speed also on max. It will take about 1/4th can to fully clear the mildew smell and stop it from growth. When parking the vehicle always put it in max a/c position so the fresh air outside the vehicle will dry out the coil.

Why Does My Air Conditioner Smell Bad? - Hydes AC

www.hydesac.com/air-conditioner-smell-bad/
Apr 15, 2015 - Does your house seem to develop a strange smell every time that yourair conditioner ... Possible reasons why your air conditioner smells bad.

Weird Car Air Conditioner Smell: What It Means and How to ...

www.carsdirect.com > Car Maintenance > Interior Car Maintenance
This causes an unpleasant odor coming out the air conditioner unit. Also ... This can result in a bad smell every time you turn on your air conditioner. You can ..

air filters when used are on the inlet side of the blower motor
that normally puts then behind the glove compartment so the glove box has to be removed to get to them
use a charcoal type filter to help reduce odour.

A "general" shop or mechanic will usually not be able to troubleshoot or diag. the problem, due to the lack of proper testing equipment needed...Most likely you have some BCM fault errors occurring and it will continue to get worse, possibly even to the point of a no start condition.
Good luck, i hope this helps.

Hi and welcome to FixYa, I am Kelly. Actually if there is mildew in the system it takes a serious cleaning of the evaporator coil and near by plastic housing / ducting to get rid of the smell. Mildew usually starts forming on the evaporator coil and compartment when the compartment drain gets to be really slow from debris or a dust clog. You can try filters and air fresheners but all they will do is mask the mildew odor. Once the mildew routine starts the only real fix is a serious cleaning of the evaporator coil, compartment and nearby air ducting. Often it takes a good mild and mildew remover to get rid of the problem completely. The evaporator compartment will for sure have to be opened up. If a service shop is going to do the cleaning job correctly they will most likely pump out the freon in the AC system and remove the evaporator coil for proper cleaning. It is not a cheap fix as it is labor intensive and requires the AC system to be drained and re-serviced. Demand that they clean the compartment drain during the cleaning process. My comments are what it really takes to purge the mildew from the AC system correctly. Your call as to fix it or live with it.
Thanks for choosing FixYa,
Kelly

This smell is caused by mold and mildew build up in the AC air passages and on the heater and the AC evaporator cores in the dash, u can spray LYSOL mold and mildew remover into the system at the air intake in front of the windshield with the blower turned to max, use about 1/4 can, then turn off the system and let it sit for an hour, then turn it back on with full heat, let that run to dry out the chemical, this will cure the smell short term until the mold and mildew grow back, it is a fix we did often in the shop, the wetter the climate u live in the worse the problem

Every single grand am I have owned does this!! They seem to have a gas smell when running the ac, or if it is extremely hot outside..It was the coil pack on 2 of mine. The extra load of the ac..the other was it makes the car run hotter. I just rigged my radiator fan to run constantly and the smell went away.

MILDEW ODORS.YOU CAN GO TO AUTO PARTS PLACE BY A CAN OF AEROSOL DISINFECTANTS FOR AUTOMOBILES ON THE CAN .IT HAS INSTRUCTION TO TELL YOU HOW TO USE IT.

I have the same problem in my 2011 sonata and i finally figured out where its coming from, its inside the doors! Put your window down and then smell the top of the door where the window slides down in...its so gross....its been making me sick to my stomach!