Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-13-2007, 02:10 PM
Registered User
 
Join Date: Dec 2005
Posts: 9
Variable Displacement AC C-Class

Hi:
I have a 99 C class with the variable displacement AC compressor.

Usually this compressor is always on. My question is it possible for it to turn itself off at low outside temperatures?

This morning it was in the mid 20s(F), and after returning from a thirty minute highway spin I noticed that the clutch was not turning. (I was checking the windshield washer fluid before putting it in the garage).
After engine shut down(and sitting for about five minutes) the compressor was spinning again.

The last time I noticed this was after a highway spin at -8F.

From what I understand the compressor always spins to keep the evaporator temp at a constant temperature (I think its 32F).
So in theory the compressor may stop spinning (compressing) if the air moving through the evaoprator (especially at highway speeds) is already at the predetermined temperature.
What do you think?

Reply With Quote
  #2  
Old 01-13-2007, 03:32 PM
Moneypit SEL's Avatar
Now what?
 
Join Date: Jun 2005
Location: SE PA
Posts: 525
The A/C compressor runs when the climate control is in Automatic, Bi-Level, or Defrost mode. The compressor does not run in Economy mode. At least that's the way GM did it when they used the V5 compressor. I suppose it's possible that MB shuts the compressor down under certain circumstances, but the whole idea of variable-displacement was to do away with a layer of electronic control.

__________________
1989 300 SEL that mostly works, but needs TLC
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 01:53 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page