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 02-28-2001, 11:02 PM
Posts: n/a
1987 560Sl 125,000 miles. Just replaced the trans. with a factory re-built and didn't realize how bad the old one was until the new one was installed, as far as smoothness of shifting was concerned. With that problem solved, the temp. gauge began to show that the car was running hot. replaced the thermostat and the sender but the problem was not solved. I checked the temp while running with a laser gun and temp was fine even though the gauge was pegged. I grounded the gauge out at the sensor and it pegged, so I think the unit is grounding out somewhere else on the car. No other gauge is affected. the temp. warms up normally, and jumps quickly to overheat when rpms are applied. When the ignition is turned off, and then turned back to the "on" position without starting the car, the temp. reads normal, around 80C. When the car is started, the needle pegs again. The gauge never reads hot when the car is off, only while it is running. Could this have something to do with the ground removed during the trans. work? Another theory is that somethng is grounding out in the ignition switch, because we have to jiggle the key sometimes while the car is running to get the air conditioning compressor to kick on. Switching on the A/C buttons also cause the temp. gauge to jump a bit. Could either of these theories be correct? If it's the electrical portion of the switch, how do I get the instrument cluster out to get to it? Thanks (I have a feeling this may be harder to track down than the trans problem)
Reply With Quote
Old 03-01-2001, 09:49 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
It very well could be the ground to the chasis from the tranny. HAVE THAT CHECKED.

I would not think that it is the ignition switch...I have never seen it cause this type of problem.
Donnie Drummonds
Reply With Quote
Old 03-04-2001, 06:29 PM
Posts: n/a
temp. gauge fixed

Thanks Donnie for your advice on the grounding strap from the trans. to the chasis. I crawled under the car and the trans. bolt that the ground was attached to was inserted, but the mechanic never tightened it. I ran it in about 1/4 inch to tighten and the temp. gauge is now operating normally. I checked all the other bolts on the trans. and the mechanic had tightened those, but i guess he forgot the ground. anywy, he'll hear about it Mon. when i'm supposed to take it back to have the gauge looked at. Thanks again and I guess I'm lucky because this will probably be the cheapest fix that I'll ever have on this car!!!
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
what does the temp. gauge measure? jblackbu Tech Help 6 12-02-2004 08:06 PM
Question- electrical troubleshooting- oscillation temp gauge+ fuel gauge with turn ericgr SL Forum 5 09-30-2004 03:36 PM
560SL External Temp Gauge jml214 SL Forum 1 04-21-2004 05:29 PM
photos of gauge cluster boost gauge, part 1 sixto Diesel Discussion 2 03-20-2004 12:44 AM
88 e300 temp gauge dead,how to test olpos Tech Help 1 01-06-2004 08:20 AM

All times are GMT -4. The time now is 01:43 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