bad smell through vents?!

[commosmart1]

I have an 04' F-250 and when I turn on the fan or the a/c it blows out a rank mildew old smell. I thought it might be the cab filter but my model does not have one. What could it be? It does it with the a/c or fan turned on.

[Matt P]

Mice? Thats what cuased a rank smell in my parents old land rover discovery

[commosmart1]

no it does not smell rotten. It smells like mildew

[kinghawg98]

take it off recirculating, its recirculating your farts.

Seriously though, its probably mildew in your vents. No great way to get rid of it short of cleaning all the vents/pipes. There is some spray product that goes through your cowl, but not sure what its called right now.

Alternatively, perhaps you could try blasting the heat on max for a while, maybe it'd kill some stuff..doubtful though. Look for the spray stuff. Who knows, maybe lysol through the cowl would work?

[Rob]

Lysol in the air inlet.

[06F250FX4]

you need some Frigi Fresh, product made just for this purose. When you run A/C on Max it is recirculating the air and causes mildew in the system and causes the smell.

[commosmart1]

Where is the air inlet located? Also with the frigi fresh how do I use it?

[blodenhd]

Did it smell like antifreeze also.

[06F250FX4]

You run the truck with windows closed, and the fan running on the ac. You spray the frigi fresh in the cowl on your truck, black piece on outside of truck where the bottom of the windshield meets. Thats where your air comes in. We usually spray quite a bit in there, then jump in the truck and turn your control to Max A/c and let the truck run for a while. Kills the microbials growing in the evaporator. Thats where the smell is. Always seems to work for us unless its something dead in the system.

[commosmart1]

I found the frigi fresh but it does not say where to spray it and Im not sure where the main inlet is that I could spray it so that it will circulate through the system to clean it. Any help is appreciated, thanks