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 ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 01-22-2000, 07:08 PM
Posts: n/a
I got a lot of good suggestions from my last post (1-16-00), but I still have the high temp problem. Up until 3 weeks ago, the temp in my 85 300D (202,650) never rose above 95* (in Summer with A/C on). Now it is running 85*-90* with heat on and up to 100* with heat off.

This is what I've done in the past week>>>

1. Replaced thermostat with 80* MB OEM unit (installed with arrow up!)
2. Replaced Expansion tank cap.
3. Flushed system 3 times
4. Replaced Radiator today with brand new radiator (not a rebuild).

I also replaced the expansion tank and water pump about 9 months ago.

Even with the new radiator, the car is still running a good 10*C hotter than it did only three weeks ago. I feel I just wasted $ on a new radiator as I am seeing no temp improvement over the old radiator.

While flushing the system, I did so with the thermostat out. After 35 minutes, the temp never got above 50*C and the defrost was barely blowing warm.


1. Could it be a bad thermostat (even though I just replaced it)
2. Could it be a bad waterpump that is not showing visible or audible signs of wear. (I never have felt a surge when squeezing the upper hose at operating temp)
3. Could it be a bad temp sensor? (how do I troubleshoot?)
4. Is it gremlins?

Thanks so much for replying with suggestions.
Reply With Quote
Old 01-22-2000, 07:49 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
As you have found, this is a hard one. You could have a bad gauge and or sender. You easily could have a faulty new thermostat. New doesn't mean good. There is an arrow on the thermostat that has to be clocked a certain direction. The other thing is that more than one degree of thermostat is available for your engine. Are you sure that you have the correct one.?

1981 280GE SWB
1987 16V

Reply With Quote
Old 01-23-2000, 06:37 AM
Join Date: Jun 1999
Location: Quezon City, Philippines
Posts: 79
Does your car have a thermally activated cooling fan? It could be slipping or sleeping.

And yes, audit your temp gauge and sender.

Did you replace the cooling system components simultaneously, or one at a time?
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Opinions on purchasing a 1987 300D swogee Diesel Discussion 12 05-03-2005 10:27 AM
auto tranmission problem in 1981 300d o2pilot Diesel Discussion 2 06-15-2004 11:19 AM
300D turbo slushbox vs 300D n/a 4 speed The Warden Diesel Discussion 5 05-28-2004 12:40 AM
Mercedes Parts FS!! 300e & 300d Cruise Control, 450sl fuel distributer, 300d cluster 6cndmbz Mercedes Used Parts For Sale & Wanted 0 04-18-2004 02:31 PM
Parts Interchange 81 300D into 83 300D BigMikeT57 Diesel Discussion 2 04-13-2004 01:38 AM

All times are GMT -4. The time now is 11:40 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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