Musty AC Smell BOOOOO - Page 2 - 2004 to 2016 Mazda 3 Forum and Mazdaspeed 3 Forums
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post #11 of 23 (permalink) Old 08-06-2015, 11:47 AM
greg42
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Quote:
Originally Posted by seanc81 View Post
I sprayed Lysol into the outside vent near the wipers and its so much better. I'll also get the cabin filter changed. Have you noticed that the system puts the AC on recirculation mode as default? I've never noticed until now.
With the manual climate controls, it puts it on recirc if you crank the temp knob all the way cold. A lot of newer cars do that and I find it annoying. At least one I drove recently takes it back off recirc if you bump the temp up off the stop, but this Mazda does not do that.

I've learned to leave the temp knob one level up from there. Although, also, I run the A/C in recirc most of the time right now anyway.
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post #12 of 23 (permalink) Old 08-08-2015, 09:55 AM
DebaryJoe
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The climate control systems in most new cars use recirculate most of the time which, over time, causes the musty, funky smell. It is the biggest reason why I chose the touring model over the grand touring. I use recirculate very sparingly and only to quickly cool the cabin of extreme heat. I usually open the windows some to vent the heat. I switch back to the fresh air setting as soon as possible and have never had the funky smell in this car or any other that I've owned.
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post #13 of 23 (permalink) Old 08-09-2015, 08:23 AM
MeteorGray
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Why would recirculated air be more musty than air from the outside? It seems to me that recirculated air is already "dryed" compared to outside air. At least this is true in my climate, where there is lots of relative humidity almost all the time.

Much of the air conditioning value around here is removing that humidity. Wet outside air is the enemy.
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post #14 of 23 (permalink) Old 08-09-2015, 09:35 PM
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Quote:
Originally Posted by greg42 View Post
With the manual climate controls, it puts it on recirc if you crank the temp knob all the way cold. A lot of newer cars do that and I find it annoying. At least one I drove recently takes it back off recirc if you bump the temp up off the stop, but this Mazda does not do that.

I've learned to leave the temp knob one level up from there. Although, also, I run the A/C in recirc most of the time right now anyway.
Mine goes to recirc automatically when I put the A/C on....
Isn't this the norm?

2.0i petrol / Deep Crystal blue / SE=L Nav
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post #15 of 23 (permalink) Old 08-11-2015, 02:33 PM
Browneye
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Quote:
Originally Posted by azbruno View Post
Years ago I read that it's a good idea to turn the AC off a short time before getting to the final destination and use the fan to blow out the system a bit.

Does it work? I don't know. But I do it anyway.
^^This.
And yes, it does work.

The smell is from bacteria on the condensor from getting shut down damp/wet. Once there you have to do the disinfecting thing and yes, that also works.

Also helps to keep fresh air coming through the system rather than recirc. I only use the latter for super hot temps or severe dust or dirt outside, or some other stench. So pretty much never.

Oh, and don't smoke, eat, or sweat in your car.
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post #16 of 23 (permalink) Old 08-16-2015, 11:57 AM
whitewash
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Ugh, I'm having this problem too, although mine only smells when I turn my AC off. I assume its still the same problem and solution, right?

Thanks very much for starting the post and for the remedy! I'm looking forward to giving this a try :-)
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post #17 of 23 (permalink) Old 08-16-2015, 09:30 PM
zero_gravity
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Quote:
Originally Posted by whitewash View Post
Ugh, I'm having this problem too, although mine only smells when I turn my AC off. I assume its still the same problem and solution, right?

Thanks very much for starting the post and for the remedy! I'm looking forward to giving this a try :-)
I'm getting same problem as you. When I turn ac off there's a very musty smell that does subside quickly.

Having severe allergies I'm a bit concerned. Lysol isn't an option for me as the perfumes in it are a problem. Might have to go bug the dealer.
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post #18 of 23 (permalink) Old 08-17-2015, 07:53 PM
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I know I said this already, but quit using the recirculate setting. If you have the automatic climate control, yo will constantly have to override it to the fresh air setting. If it already smells some, you may need to disinfect it to completely get rid of it.

I live in hot, humid Florida and my AC does not smell because I use the fresh air setting 99% of the time. I only use recirculate to quickly cool it off, but only for a few minutes before switching back to fresh air.
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post #19 of 23 (permalink) Old 08-18-2015, 09:10 AM
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Sometimes the smell is caused by molds in the A/C's evaporator coils.
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post #20 of 23 (permalink) Old 11-07-2015, 06:14 PM
whitewash
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Quote:
Originally Posted by zero_gravity View Post
I'm getting same problem as you. When I turn ac off there's a very musty smell that does subside quickly.

Having severe allergies I'm a bit concerned. Lysol isn't an option for me as the perfumes in it are a problem. Might have to go bug the dealer.

Update here, did the suggested fix and vacuumed off my cabin air filter at the same time. The Lysol left behind a perfume oder for nearly a week, I was beginning to worry I may have the sent permanently but it did completely disappear with time.

The bad smell is gone! thanks so much for helping me fix this, significant improvement for the car :-)
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