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 06-27-2006, 03:48 PM
Registered User
 
Join Date: Jun 2006
Posts: 3
Post 1994 E320 Faulty Temperature Gauge

For some reason my coolant temperature gauge rises to 119 degrees celsius when driving then drops back to 100 celsius but rarely if ever stays at the normal 82 celsius operating temperature. Yet, I have replaced the radiator, water pump, thermostat, thermostat housing, thermometer, and fan clutch. The hoses attached to the radiator are good condition. The thermostat was checked before in hot water to ensure that is was not defective.
Additionally, my mechanic has an infrared laser and simply points it at any engine part and measures the temperature. We pointed the laser directly at the thermostat housing and thermometer which sits about a centimeter away and the infrared beam reads perfect 80 to 82 celsius. The radiator reads the same. But even while idle the gauge reads over 105 celsius. Now, I just had the head gaskets replaced and 9 valves replaced and after putting the engine back to together the black plastic covering over the center of the straight 6 engine does not screw back properly because the threads inside the head are stripped. The cover comes up about a half an inch when the hood is raised but is kept in place by the plastic air intake that goes over the top of the engine. Any advice would be appreciated...


Last edited by amg_600sl; 06-27-2006 at 05:55 PM.
Reply With Quote
  #2  
Old 06-27-2006, 03:50 PM
Battlecat714's Avatar
NEEZ FTW!
 
Join Date: Apr 2006
Location: Anaheim, CA
Posts: 339
have you replaced the engine/coolant temp. guage?
__________________
1994|040|W124.036|E500
http://www.mbworld.org/forums/image....ine=1216527951
Reply With Quote
  #3  
Old 06-27-2006, 05:52 PM
Registered User
 
Join Date: Jun 2006
Posts: 3
Mercedes calls the thermometer (Temperature Gauge)

Yes, I just replaced the temperature gauge. Mercedes names the thermometer that screws into the water pump the temperature gauge. I suppose the cap goes on the single pin thermometer and the wire that feeds through the electrical plastic covering beside the engine then throught the fire wall and into the instrument board could have a problem as well.
Reply With Quote
  #4  
Old 06-27-2006, 06:03 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Ohm the sensor unit

OHM 110 = 60C
67 = 80C
38 = 100C

I have a 38 ohm /1% tol. resistor in my tool box that I sub in place of the sender unit.. this will tell if the gauge or sender is the fault without having to warm the coolant/run the engine to the different temps......Radio Shack item
Reply With Quote
  #5  
Old 07-04-2006, 12:31 AM
Registered User
 
Join Date: Jun 2006
Posts: 3
Further explanation

Could you provide a detailed explanation on how you use that apparatus? I wasn't quite following.
Reply With Quote
  #6  
Old 07-04-2006, 12:43 AM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
The Apparatus.... yeah, I like that ..

If you look at the chart I posted , you notice what the ohms of the temp sender unit should read at specified temps and the gauge should correspond .
So, if you unplug the temp sender unit and substitute a 38 ohm resistor in its place , the gauge should read 100 C.
If the gauge does not read the correct temp, you know you have an out of calibration/faulty gauge.
[ or possible poor connection]

And when the sensor is hooked back up, when the gauge indicates 100C, the sensor should read out at 38 Ohms.


Last edited by Arthur Dalton; 07-04-2006 at 01:02 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




All times are GMT -4. The time now is 03:01 AM.


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