Odor from HVAC vents on Dodge Ram 1500

Problem Description and Possible Solution

Some vehicles may develop a musty odor coming from the HVAC system, Dodge has issued a cleaner/disinfectant and a coating for the evaporator designed to inhibit bacterial growth.

Problem Data
RepairPal Verified
Average mileage: 97,220 (16,500–253,000)
12 model years affected: 1994, 1995, 1997, 2002, more2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
54 people reported this problem
Viewing 1 - 20 of 25 problem details
Sudden issue with strong mold mildew smell blowing from A/C vents on every start up. Smell is string on start up and then lessens some as you drive.
the a/c smells a little musty
musty dirty smell coming from ac vents
TURN ON THE FAN AND YOU CAN SMELL MILDEW-NOT FIXED YET
Using the A/C with fresh air produces a musty smell of the air entering the cabin from the HVAC system. I looked in the manual if there was an air filter for the cabin to change with no avail. After returning from an overseas military assignment where the truck was in storage for 3 years, took it for service and asked the dealership to troubleshoot and solve the problem. There was no filter to change/replace so the service department flushed the fresh air intake (at the base of the windshield with a pressure washer/cleaner) and also ensured there was no clog for the A/C drain. Now the fresh air and A/C does not have the musty smell.
musty smell after the truck has run and then shut off and restarted. the smell last until the heat gets hot.
Strong chemical odor after weeks of rain. Thinking of putting a bleach mixture mist down the outside intake to get it in the drain pan and coils.
Bad mold smell weather AC is on or not.
Have tried various mold killer products to no avail.
It's most likely growing on the evaporator.
Still can't get rid of it.
I tried spraying Lysol into the fresh air intake with fan going on high ,no help tried 50% water and Clorox neither helped at all . And since to get to the problem you had to remove the AC freon drain the antifreeze to get the heater and AC core out I thought of using my leaf blower . The one air vent that put out the most air on driver side by door I taped the two on right ,pluged the heater outlets . I took off the trim around the instruments and plugged the one in the center . With the grill off the far left I got a three inch flex hose hooked up to my leaf blower I had to hold it there no way to connect it and ran leaf blower for about 10 minutes . It must have had a bunch of stuff on there and it blew it off probably still in there but at least not on the AC evaporator coil . I saw where nothing cam out but at least the smell seems to be gone for now.
No repair. My local dealer has no idea how to fix it.
Had musty odor;delt with it thinking pet or other dirt issue. Then found leak in roof seal going down rear window; fixed leak after 3 trys and carpet replaced; But, never have gotten rid of musty odor
The heat smells bad for a few minutes then goes back to normal
Start the vehicle and turn on the fan blower. Get musty smell of the air entering the cabin for about one minute. Installed a cabin air filter, but it did not help.
Smells when heater is on
Cabin air smells terrible at startup.
Bad smell in ac vent
Smells musty when air is turned on, I've only put the air freshener in the vents
It has smelled like this for years . My wife says she don't want to ride in it now smells so bad . To get to the evaporator core where the problem is . You practicly have to dismantle the cab you got one bolt behind the brain box,the toe side panels there is a bolt they also have the door step threshold needs to come off . the panell below the steering wheel needs to come off to loosen the steering wheel. I just have not done it yet. I shrayed 50-50 clorox & water in there wiyh fan running on high . It smelled better at first but next day it smelled the same .
Musty mold smell from the AC vents how do I fix it It has had this smell for years it is getting worse as time goes on .How do I get to the air intake I think under the hood .
When the fan for the HVAC blower is turned on, a very musty smell is exhausted through the vents.