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Discussion Starter #1
'06 CLK350 (209), customer went to dealer with concerns of odours from HVAC with fan on. Dealer tested for leaks, replaced cabin filts, told her nothing more can be done.
Brought to us and we can smell a chemical odour eminating from the vents.
Is there anyone w/access to MB tech bull on the 209 HVAC smells.
This is NOT a refrigerant odour.
 

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Bulletin P-B-83.30/74 has recently been updated (now on revision H) for a "musty/moldy" odor. In the past, we been using some kind of ultrasonic cleaner created by Wynn's to circulate through the vents. That has now been replaced by M-B Contra Sept cleaner. I have yet to use the new stuff. The older Wynn's stuff seemed to just change the odor, instead of eliminating it. I've had to replace a few evaporators because of it.
 

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It smells very much like nail polish or a very intensified "new car smell." Owner doesn't use A/C here in SoFL because it makes her feel ill.
FEMA trailers allegedly doing the same thing!
 

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In southern Fla there is a very real possibility that something bad is growing inside the ducts. Try turning the system on full blast and spraying an anti bacterial agent like Lysol into the intake for a few minutes and see if that clears it up.
 
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