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 02-19-2003, 09:48 AM
zorin's Avatar
Registered User
Join Date: Feb 2003
Location: Ottawa, Canada
Posts: 126
Cool Wandering Temp quage

On my 1988 E260, recently I have noticed that when
the car has reached normal operating temp, the guage will start moving erraticly and slowly between the 80 and 120 mark. It stays at high temp for few seconds then jumps down qucikly. What might be causing these symptoms?
I already have checked for air in radiator.

Any help would be appreciated.
Reply With Quote
Old 02-19-2003, 09:56 AM
Registered User
Join Date: Jul 2002
Location: Dallas
Posts: 330
Sounds like your thermostat is suspect.
Reply With Quote
Old 02-19-2003, 02:38 PM
zorin's Avatar
Registered User
Join Date: Feb 2003
Location: Ottawa, Canada
Posts: 126
I already changed the thermostat but that did not get rid of the problem. I also tested the temperature sensor for the gauage which was OK.
Reply With Quote
Old 02-19-2003, 03:15 PM
Registered User
Join Date: Apr 2000
Posts: 459
I had a Saab that occasionally did the same thing, and it was always either the thermostat or air in the system just after I had changed the thermostat. Is there a procedure for bleeding the air out of your coolant system after its been opened?

On the other hand, its not impossible that your new thermostat is malfuncitoning. Considering the damage that could result from your engine overheating, I'd swap in a new one, and MAKE SURE its a real German thermostat. Generic brand thermostats from the local parts store shouldn't be trusted. They are often of different (inferior) design than OEM quality thermostats.

Lastly, barring problems with the new thermostat and bleeding air from the system, replace the coolant temperature sensor, and also check the wiring that connects to the temperature sensor. If the insulation is brittle and cracking, you could have a short somewhere that causes the erratic gauge behavior.

Good luck,

'84 300D
'90 300CE
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

All times are GMT -4. The time now is 05:26 AM.

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