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 > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 10-16-2004, 01:23 PM
dannym's Avatar
I'm not here
Join Date: Oct 2004
Location: Deltona, Florida
Posts: 2,360
Auxilliary fan on a 1984 300SD

Hey everyone,
I have never seen the auxiliary fan come on. I always thought that the fan came on as soon as the AC was started. But being that it has an engine fan that may not be the case.
I did a search and someone said there is another relay or fuse at the fan motor area, is this true?
I also read that it will only come on if the AC gets hot at the sensor on the accumulator.
I also know it's not getting power. Is this normal or should I try to find out why it's not working?



Reply With Quote
Old 10-16-2004, 01:27 PM
jbaj007's Avatar
Registered User
Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
Jump the leads to the switch at the receiver/dryer. It is the "upper" switch of the two there. The fan should then come on. On the '84 SD only higher high side refrigerant temp/pressure triggers the aux fan.
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
Reply With Quote
Old 10-17-2004, 12:09 PM
Registered User
Join Date: Aug 2004
Posts: 34
These pressure swithches can go bad. I would replace with only the red colored one. It closes at a lower pressure and will help save compressor life. High pressure = high temperture which = short life of compressor. Also when replacing put a new Reciever dryer in at the same time. They go bad with age alsoand will kill your TXV valve. That is a day and a halfs labor to replace.
My 2 cents. I'm not positive it is red but fastlane nows.

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 09:45 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