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      02-02-2019, 04:53 PM   #45
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Drives: N54 e82
Join Date: Feb 2010
Location: Bayern, Germany

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Originally Posted by Thunderguts View Post
I'm worried about just spraying blindly up the drain hose. Has anyone had any bad experiences doing this? I don't want the foam overflowing and running out anywhere.
Well.. thats the whole point of these cleaning foams... to soak the evaporator and clean out all the mold inside of the HVAC box. Doing it from under the car is safe - bc thats how its done in most shops. Of course you can also do it from the topside too(after the blower motor!).

IF your car is really bad, you might need a second can and spray down the AC vents. But that's pretty rare. Try to get up in the evaporator box for best results. Maybe you can remove the glove box & blower motor and spray down in there that way. ?