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

LinkBack Thread Tools Display Modes
Old 02-10-2006, 10:45 PM
Registered User
Join Date: Feb 2006
Posts: 4
2004 CLK 320 A/C On/Off operation

I have a 2004 CLK 320, which I purchased used several months ago. I am still getting familiar with some of the controls. I am a bit confused about the A/C OFF button functionality. The owner's manual indicates that hitting this button will turn the A/C compressor off. When I have the cooling system set at a low temperature (it's hot outside), I have both cooling zones set to AUTO, and I hit the A/C OFF switch, it is clear that the compressor is still running and very cold, air conditioned air continues to come out of the vents. The dealer told me that this is normal - that the compressor always runs in this model - this contradicts logic, and the owner's manual. I would assume there is a way to run the cooling system in an economy mode, similar to selecting VENT on older cars. Can someone enlighten me on this issue?
Many thanks,
Reply With Quote
Old 02-11-2006, 12:00 PM
Senior Member
Join Date: Sep 2002
Posts: 2,648
After you push the A/C OFF button wait a few minutes and see if the air is still cold. The compressor can take up to two minutes to reduce it's output and then the evaporator temperature will need to stabilize. Remember that MB has used variable rate A/C compressors for a few years now, so the "clutch" always appears to be turning.
Reply With Quote
Old 02-12-2006, 09:37 PM
Registered User
Join Date: Feb 2006
Posts: 4
Thanks for the input. I believe I have tried waiting a couple of minutes, but I will give it a shot again.
Reply With Quote
Old 02-13-2006, 11:13 AM
Ali Al-Chalabi's Avatar
Senior Member
Join Date: Nov 2000
Location: Knoxville, TN
Posts: 1,837
I believe that some of the newer A/C compressors do not have a clutch that allows them to disengage the compressor from the drive pulley, these compressors can never be completely turned off.

However, they are variable displacement and can vary the displacement to below 5% of maximum allowable displacement. Hitting the EC button should take the compressor down to minimum allowably displacement, which is the closest to off that it can get. Therefore, you should still get a hair of cooling out of it.
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
Reply With Quote


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 04:15 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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