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 07-01-2005, 04:59 PM
Registered User
 
Join Date: Jul 2003
Posts: 14
engine over heating when air conditioning is on.

Hi I have a 1994 c280 (202) and my car is over heating when the air conditioning is on, it doesn’t redline but it gets really close. Any ideas on how to fix this problem would be great. Thanks Ray.
Reply With Quote
  #2  
Old 07-01-2005, 05:08 PM
LarryBible
Guest
 
Posts: n/a
Two basic things, the main issue is general cooling system condition and operation. You might take it to a radiator shop and ask them to pressure test it. They usually charge nothing for this. When the a/c is on it is in hot weather and the condensor in front of the radiator adds heat to the air that makes its way to the radiator, so it is naturally going to run a little warmer than in the non a/c months.

Secondly with the air conditioning turned on and stabilized, the aux fan should come on.

How hot is it getting?

Good luck,
Reply With Quote
  #3  
Old 07-01-2005, 05:14 PM
Registered User
 
Join Date: Aug 2003
Location: New Orleans, LA
Posts: 305
check the aux fan fuse for starters.
__________________
2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car

Last edited by schumi; 07-01-2005 at 06:10 PM.
Reply With Quote
  #4  
Old 07-01-2005, 05:51 PM
Registered User
 
Join Date: Jul 2003
Posts: 14
The engine temp reaches 120c and the aux fans do not turn on.
Reply With Quote
  #5  
Old 07-01-2005, 06:31 PM
Registered User
 
Join Date: Jul 2003
Posts: 14
the aux fan fuse is that located in the trunk of the car? i cant seem to find anything under the hood.
Reply With Quote
  #6  
Old 07-01-2005, 06:59 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Jumper the pressure switch on the reciever/drier [ the one with the pig-tail leads ] with a/c on and see if Aux Fan comes on.
If Yes , fan cicruit is OK , you have a low refrigerant or pressure sw problem
If No, Take six screws around fuse box off to get to relay compartment behind fuse box There are two fan relays , Look on top of them ..possible fuse problem....
If No, check connections at dropping resistor behind driver headlamp.. this if part of aux fan feed circuit to fan motor/s..

Last edited by Arthur Dalton; 07-01-2005 at 07:05 PM.
Reply With Quote
  #7  
Old 07-01-2005, 07:11 PM
Registered User
 
Join Date: Jul 2003
Posts: 14
it was the to relay fuse that were blown. Thanks for all your help you people are great. thanks again Ray.
Reply With Quote
  #8  
Old 07-01-2005, 07:15 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Quote:
Originally Posted by BENCHEDUS
it was the to relay fuse that were blown. Thanks for all your help you people are great. thanks again Ray.

FIY.
Benz has OKed that fan fuse be upgraded from 15 to 25A on dual fan models
Reply With Quote
  #9  
Old 07-02-2005, 09:32 AM
LarryBible
Guest
 
Posts: n/a
Quote:
Originally Posted by Arthur Dalton
Jumper the pressure switch on the reciever/drier [ the one with the pig-tail leads ] with a/c on and see if Aux Fan comes on.
If Yes , fan cicruit is OK , you have a low refrigerant or pressure sw problem
If No, Take six screws around fuse box off to get to relay compartment behind fuse box There are two fan relays , Look on top of them ..possible fuse problem....
If No, check connections at dropping resistor behind driver headlamp.. this if part of aux fan feed circuit to fan motor/s..
The low refrigerant pressure switch does not control the aux fan, it interrupts the clutch to save the compressor. The high side temp switch is what turns on the aux fan.

Your help is appreciated and I'm sorry to split hairs, but I just wanted to save someone the confusion.

Have a great day,
Reply With Quote
  #10  
Old 07-02-2005, 10:36 AM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
I already split the hair for him , Larry.
There are two pressure switches on the drier on his model, so to save the CONFUSION, I purposely identified the High side pressure sw. with the pigtail wire notation included in the test procedure. [I even put the info required to differenciate the switchs in brackets for him].. The other sw does not have a pig tail wire set-uo, it has direct spade terminal connectors.
I sometimes use the Benz designation part ID #s , but I have found that to be of little use for the average poster, so a visual discription [ie- pigtail ]works fine here.
So good of you to correct the post, though.. next time I will go to futher lengths to include more detailed sw ID.

Thanks

Last edited by Arthur Dalton; 07-02-2005 at 10:49 AM.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Polished PERFORMANCE AIR INTAKE/ Engine cover W124 M103 86-92 300E 260E Cheap!!! FA22 Mercedes-Benz Used Parts For Sale & Wanted 4 09-01-2010 08:03 AM
300TD Air Conditioning Problems flbiggs Diesel Discussion 10 08-17-2007 07:20 PM
Oil in the air filter. 617 engine. More than normal. dmorrison Diesel Discussion 5 11-13-2004 08:46 PM
Air conditioning switch over valve smartin Diesel Discussion 0 09-20-2004 12:26 PM
Will Alum 240D Air Cleaner Fit on 300D tcane Diesel Discussion 0 01-10-2002 07:33 PM



All times are GMT -4. The time now is 04:40 PM.


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