Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 05-12-2001, 07:54 PM
David C Klasse's Avatar
CheFrac is Back!
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Will the fans turn on if you are going 80 mph? I was driving over 80 and the temp was above 100 C. Will the fans still come at this speed even though plenty of air is rushing through? (Just curious...)
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
Reply With Quote
Old 05-12-2001, 09:00 PM
Posts: n/a

Yes the fans are controlled by two sources. 1) The high pressure switch on the A/C system and 2)the coolant temperature switch. If the pressure in the A/C system reaches a set level, both fans will come on at low speed. If the engine coolant temperature reaches (I think)approximately 110c the fans will go into high speed. There are two relays that control the high amperage flow to the fans though a resistor mounted near the fans. The resistor provides the path for low speed and is bypassed for high speed. The relays have fuses plugged into the top of them. The low speed relay fuse (15amp) is prone to easy blowing. I've replaced mine with a 20amp and haven't blown one in over a year. It is not a danger to that circuit to increase the fuse it a 20amp.

[Edited by ARJAY on 05-12-2001 at 09:07 PM]
Reply With Quote
Old 05-13-2001, 07:31 PM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
I don't think that the auxiliary fans come on at that kind of speeds. Whenever I drive that fast in summertime I have a constant temperature reading of 95 degrees.
I have driven with the auxiliary fans continuously on (no ground connection with the dash cluster = engine temp control) in summertime and at high speeds and the engine temp only reached about 90 there is no need fro the auxiliary fans to come on at those speeds with sufficient airflow.

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Aux Fans broke? / 92 300e 2.6 Miles81_240d Tech Help 5 04-23-2003 11:19 PM
AUX fans not working correctly? Familycar Tech Help 1 11-18-2002 12:08 AM
Aux Fans - My solution DAVID LEE Tech Help 27 10-15-2002 09:31 PM
C280 Aux. Fans ARJAY Tech Help 1 05-20-2000 06:50 AM
300CE Aux Cooling Fans Kevin_300CE Tech Help 2 05-11-2000 07:44 AM

All times are GMT -4. The time now is 08:02 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page