SL55/63/65/R230 AMG: A/C not as frosty...
Thread Starter
Senior Member
Joined: Feb 2016
Posts: 328
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2004 SL55 AMG
A/C not as frosty...
I don't have any hard #s but my 2004 SL55 a/c was cool but not cold when I bought it six months ago. I added some "freon" and it got downright frosty.
This week it was cold but not frosty (again I don't have any measurements, just relative feel) so I assumed I needed another hit of freon but it would not take any.
1. Does anyone have the optimal temperature F or C at the vent exit for the system when its optimal?
2. Is there any simple weaknesses I can check (fuse for condenser fan, etc...) that I can check?
Thanks,
Tom
This week it was cold but not frosty (again I don't have any measurements, just relative feel) so I assumed I needed another hit of freon but it would not take any.
1. Does anyone have the optimal temperature F or C at the vent exit for the system when its optimal?
2. Is there any simple weaknesses I can check (fuse for condenser fan, etc...) that I can check?
Thanks,
Tom
Last edited by Tomcat SL; Aug 28, 2016 at 09:02 AM.
MBWorld Fanatic!
Joined: Feb 2009
Posts: 6,897
Likes: 85
From: Central WI (BFE)
SL55, ML500 & Acura TL
From what I have read, a differential of 45 to 50 F is a good rule of thumb for a car a/c system. You appear to have a differential of about 48. When was the last time you changed air cabin filters? Also, on really hot, high humid (dew point) days, you might try getting the cabin a bit cool then switch the a/c to recirc. If your differential is 45 and the cabin air return temp is 80 you are now discharging 35 degree air.
MBWorld Fanatic!
Joined: Feb 2009
Posts: 6,897
Likes: 85
From: Central WI (BFE)
SL55, ML500 & Acura TL
Was thinking about you today. I think the WI air national guard is maybe doing some ACM not too far from where I live in the middle of nowhere WI. I can see some pretty aggressive looking turning vapor trails. Every once in a while, we get a pretty good boom. Guessing the are getting supersonic at altitude.
Thread Starter
Senior Member
Joined: Feb 2016
Posts: 328
Likes: 22
2004 SL55 AMG
Was thinking about you today. I think the WI air national guard is maybe doing some ACM not too far from where I live in the middle of nowhere WI. I can see some pretty aggressive looking turning vapor trails. Every once in a while, we get a pretty good boom. Guessing the are getting supersonic at altitude.
I had a blast...and got in a lot of trouble, hence I got off active duty after ~11 years and went Reserves.
