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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-21-2006, 02:35 PM
Professional smart ass
 
Join Date: Jan 2005
Location: Sunny San Diego
Posts: 723
SD to cold, now too hot

I just replaced the thermostat on my 81 sd because it was sticking open and running way too cool. It runs a lot hotter with the new t-stat, but I'm not too sure if its too hot or not. Before it never got over 90, even when going up mountains. Now it stays at 100 degrees or a little over pretty much all of the time. Could it be a bad thermostat? Is 100 in normal operating temp.?

__________________
"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

http://www.wecrash.com/pics/ddda_banner.gif
Reply With Quote
  #2  
Old 02-21-2006, 10:15 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,307
They should run about 80Cish. Mine did that as well, as soon as I replaced the t stat the temps would come up to almost 100C on the highway. As it starts to warm up over the next couple of months I will have to clean out the radiator.

Your radiator is clogged, either internaly or externaly.
__________________
2020 GMC Sierra Denali
2007 Tiara 3200
Reply With Quote
  #3  
Old 02-21-2006, 10:27 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,298
well i dont know

about the rad being plugged. before changing stat it ran cold.

did you check the degree of the stat? there are different ones floating around. also did you check it before installing in boiling water? not a bad idea to do.

also did you run and refill to be sure to get out the air from the system?

tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #4  
Old 02-21-2006, 11:22 PM
Professional smart ass
 
Join Date: Jan 2005
Location: Sunny San Diego
Posts: 723
Run and refill? I've never done that. Do you just add the coolant with the engine running?
__________________
"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

http://www.wecrash.com/pics/ddda_banner.gif
Reply With Quote
  #5  
Old 02-21-2006, 11:31 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,307
Do you have to add coolant? Did you even drain the coolant to change the t stat?

Running the heater on high is all that should be needed for the system to burp itself. That and normal driving.
__________________
2020 GMC Sierra Denali
2007 Tiara 3200
Reply With Quote
  #6  
Old 02-22-2006, 12:00 AM
Hit Man X's Avatar
I LOVE BRUNETTES
 
Join Date: Sep 2004
Location: FUNKYTOWN
Posts: 9,087
Thumbs up

Sounds like air in the system and/or a bad fan clutch. I FINALLY have the SDL running normal temps now, new M103 clutch , thermostat, and running coolant flush currently. Will be drained and refilled with Xerex this weekend.
__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
Reply With Quote
  #7  
Old 02-22-2006, 12:06 AM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,317
There could be an airlock in the system, it happened on our 83 when I ran it after all the work I did on it, pouring coolant into the upper radiator hose (disconnected from the radiator) till it was full, then quick reattaching it solved the issue.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 90k - mine - (OC-91,200)
'17 Metris(VITO!) - 18k - wifes (OC-25k)
'01 E320 Wagon - 161k - mine (OC-165,000)
'01 E320 - 180k - dad's (OC-182,500)
'07 E350 Wagon - 134k - dad's (OC-139,500)
'01 SL500 - 56k - dad's (OC-59,000)
'16 E400 4matic Sedan - 81k - Brothers (OC-88,000)
Reply With Quote
  #8  
Old 02-22-2006, 02:51 AM
Professional smart ass
 
Join Date: Jan 2005
Location: Sunny San Diego
Posts: 723
Thanks I'll give that a try tomorrow morning.

__________________
"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

http://www.wecrash.com/pics/ddda_banner.gif
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 08:57 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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