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 04-29-2011, 11:04 AM
Registered User
Join Date: Apr 2011
Location: scottsdale, az
Posts: 1
500sl overheat issue

I have a 91 500 sl that overheats only when the a/c is on. It runs roughly at 85 degrees celcius with no a/c then jumps to over 100 degrees with the a/c on but it never goes into the red area on the temp guage. I would say it gets to about 110 degrees max while driving the car.(at this point the coolant starts to boil out of the overflow container on the passenger side of the car) If I leave the car sit and let it run with the a/c on it never goes above 90 degrees. any ideas on what the problem could be? cooling fans are working and coolant levels are ok...

also if i pressure test the system I get air coming out of my overflow tank-looks like its between the plastic housing and the actual bottle itself, is this normal?

Reply With Quote
Old 04-29-2011, 08:04 PM
Senior Member
Join Date: Jul 2002
Location: visalia ca
Posts: 368
you are loosing pressure in the syatem. you need pressure to keep it from boiling over. fix that. also is the eng fan actually working ? also you could have a partially plugged up radiator. when hot, feel around the radiator. if you don't have full heat everywhere then the rad is plugged.
Reply With Quote
Old 04-30-2011, 02:32 PM
Registered User
Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,077
lucky4teen, try replacing the cap on the expansion tank.

Fred Hoelzle
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 12:21 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, 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