The fact that the compressor stays engaged suggests its not the air temp sender?
-----Original Message-----
From: "Brian Toscano" <brian.tosc...@gmail.com>
Date: Wed, 29 Sep 2010 18:50:24
To: Mercedes Okie Benz Mailing List<mercedes@okiebenz.com>
Reply-To: brian.tosc...@gmail.com
Subject: Re: [MBZ] AC diagnosis - cause of AC fade-out?
I would think a sticking expansion value could cause issues also. If you
aren't losing airflow you may not have a freezing evap. The expansion valve
can be replaced from under the hood.
-----Original Message-----
From: "Dillon, Meade M CIV SPAWARSYSCEN-ATLANTIC,
53310" <meade.m.dil...@navy.mil>
Sender: mercedes-boun...@okiebenz.com
Date: Wed, 29 Sep 2010 14:47:08
To: Mercedes Discussion List<mercedes@okiebenz.com>
Reply-To: Mercedes Discussion List <mercedes@okiebenz.com>
Subject: Re: [MBZ] AC diagnosis - cause of AC fade-out?
Thanks Brian - I'm hoping for something simple and cheap - almost
nothing else on this car has been simple/cheap so far...
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Brian Toscano
Sent: Wednesday, September 29, 2010 2:39 PM
To: Mercedes Okie Benz Mailing List
Subject: Re: [MBZ] AC diagnosis - cause of AC fade-out?
With a guage - Low pressure or even vacuum on the low pressure side. On
my Subaru when its evap temp sender wasn't working the low psi side
would frost all the way to the compressor!
-----Original Message-----
From: "Dillon, Meade M CIV SPAWARSYSCEN-ATLANTIC,
53310" <meade.m.dil...@navy.mil>
Sender: mercedes-boun...@okiebenz.com
Date: Wed, 29 Sep 2010 14:32:30
To: Mercedes Discussion List<mercedes@okiebenz.com>
Reply-To: Mercedes Discussion List <mercedes@okiebenz.com>
Subject: Re: [MBZ] AC diagnosis - cause of AC fade-out?
Thanks Loren - I guess Brian's response gives the TS hint - reduced
airflow - if the evap is icing up. Car is relatively new to me, and at
least two prior repairs (I use the term loosely) were of such low
quality that it wouldn't surprise me if any AC work done was also done
poorly. I do have a R123 gauge, I would imagine icing inside a line
would show an unusually high high-side pressure?
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Dieselhead
Sent: Wednesday, September 29, 2010 9:51 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] AC diagnosis - cause of AC fade-out?
Could be icing up the evap or could have ice blocking the line if it was
not evacuated well last time.
>On my '95 E300, the AC starts out strong, but after about 20 minutes it
>is noticeably weaker and eventually it fades completely away (goes from
>very cold to cold to sort-of-cold to ambient). AC compressor clutch is
>staying engaged.
>
>Could this be a leaking monovalve insert? Next time I can play, I'll
>see if the refrigerant lines are still cold.
>
>Very respectfully,
>/s/
>Max Dillon
>'87 300TD 329k miles
>'95 E300 275k miles (On the Road!)
>'73 Balboa 20
>Charleston SC
>
>
>
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