AC Evaporator Cleaning
Thread Starter
Super Member
Joined: Dec 2007
Posts: 980
Likes: 224
2005 S500 Designo
AC Evaporator Cleaning
Has anyone cleaned the evaporator in the W220?
There is a recommended procedure in WIS for this job (AR83.30-P-5555T and/or AR83.30-P-5556A) but I can't find specific info for the W220. A dealer quoted me $700.
There are very special tools and chemicals for this job, but there's also this:
from Germany that's an order of magnitude cheaper and that I plan on using on the evaporator.
Part of the $700 quote included the replacement of all four cabin air filters.
So basically I can't find any info on this job and I'm wondering if someone else has done it.
There is a recommended procedure in WIS for this job (AR83.30-P-5555T and/or AR83.30-P-5556A) but I can't find specific info for the W220. A dealer quoted me $700.
There are very special tools and chemicals for this job, but there's also this:
from Germany that's an order of magnitude cheaper and that I plan on using on the evaporator.
Part of the $700 quote included the replacement of all four cabin air filters.
So basically I can't find any info on this job and I'm wondering if someone else has done it.
Last edited by Fried Chicken; Oct 3, 2024 at 02:35 PM.
Super Member
Joined: Sep 2012
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From: Montreal, Quebec
2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M
What is the reason for cleaning the evaporator?
To me the filters are a separate job, especially the charcoal filters which I never really use.
To me the filters are a separate job, especially the charcoal filters which I never really use.
Thread Starter
Super Member
Joined: Dec 2007
Posts: 980
Likes: 224
2005 S500 Designo
The reason for the cleaning is poor AC performance, even after replacing the pump and servicing the entire unit. Either the mixture flap is stuck, which I don't believe is the case, or the evaporator core is dirty.
Thread Starter
Super Member
Joined: Dec 2007
Posts: 980
Likes: 224
2005 S500 Designo
I found the evap core temp sensor; first remove the tupperware under the instrument cluster, then it'll be up and to the right. You disconnect plug (2-wire plug) and then pry it out with (carefully) with needle noses.
This will give you access to the back of the evaporator core (in terms of airflow direction), and then I used . Foam it up and let it sit for 20 minutes per the instructions. It should drain out through the drain tubes, then you put the AC on high.
Fingers crossed this works and restores good cooling to the car w/o breaking anything.
This will give you access to the back of the evaporator core (in terms of airflow direction), and then I used . Foam it up and let it sit for 20 minutes per the instructions. It should drain out through the drain tubes, then you put the AC on high.
Fingers crossed this works and restores good cooling to the car w/o breaking anything.
