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 04-10-2009, 03:24 PM
Registered User
 
Join Date: Oct 2005
Posts: 36
'87 300 E overheating

From what I have seen, this seems to be a common problem on this model.
Please advise what my next step should be. The car quickly gets to 120C and will even whistle from being too hot.
Replaced the thermostat today, idled it in the driveway to see if this solved the problem. Within 5 minutes, it was up to 120C again.
What should I do next? Radiator cap?
The electric fan did kick in~ isn't enough to keep the temp down

Reply With Quote
  #2  
Old 04-10-2009, 03:36 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
replace the fan clutch,it's probably freewheeling and not locking up.
__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
Reply With Quote
  #3  
Old 04-10-2009, 03:47 PM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Well, since the electric fan isn't cutting it either (and I assume it will do it on the road, where the fans no longer matter), I would be suspicious of the radiator either plugged internally OR the outside is full of dirt, bugs, leaves, etc keeping the air flow from passing through the radiator, OR the AC condensor plugged up, again leaves or dirt or whatever keeping air from flowing through. More than likely internal to the radiator though, what's the coolant condition, been flush/replaced/serviced lately? I'd start by pulling the radiator and inspecting the outside and then you can see the condensor pretty well, if all looks fine then get it to a radiator shop for checking.

Gilly
Reply With Quote
  #4  
Old 04-10-2009, 03:49 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,438
Yeah if its getting that hot even when going 50-70 down the road its a problem other than the fans....at those speeds the fan isn't really doing anything.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
Reply With Quote
  #5  
Old 04-11-2009, 10:09 AM
Registered User
 
Join Date: Feb 2009
Posts: 35
Just for the sake of completeness, you may want to check the water pump weep hole to be sure the water pump is still pushing enough water through the system (and not failing) or that you're not leaking any fluid.
__________________
1987 300e W124 M103 My baby.
Reply With Quote
  #6  
Old 04-12-2009, 10:16 PM
Registered User
 
Join Date: Oct 2005
Posts: 36
Overheating update

Well, I have had the cooling system flushed (it was pretty ugly stuff) and replaced the radiator cap.
Sprung a leak in the lower radiator hose, wil try to get that changed tomorrow. Car was still overheating AFTER the flush *before the leak*.
Where is the water pump weep hole? Top? Drivers? Passengers?
Thanks for helping out on this!
Reply With Quote
  #7  
Old 04-13-2009, 12:00 AM
Registered User
 
Join Date: Jan 2008
Location: Melbourne Australia
Posts: 844
Either you have a blockage or your water pump is not working at all.

Since you have had the system flushed. Try turning on the heater and see if that makes a difference. If it does not there could be that there is no circulation which could indicate a water pump failure.

Water leaking out of the water pump outlet does not indicate a total failure of the pump - rather a bearing failure.

If your auxillary fan is not cutting in that this does not indicate a sensor failure for this.

Are you sure that your water temperature gauge is indicating correctly?

As already mentioned above. The fans are irrelevant when cruising at 50 Mph or even Kph.
Reply With Quote
  #8  
Old 04-20-2009, 09:16 PM
Registered User
 
Join Date: Oct 2005
Posts: 36
I am reasonably sure the guage is accurate, or at least close. The car has gotten so hot that it whistles ..... Since I don't want to have to replace a head gasket too I have parked it until this is resolved.
Blockage or water pump at this point....??....
Too much on the calendar already for this week, will post again when I have more info.
Thanks again for the feedback!
Reply With Quote
  #9  
Old 04-20-2009, 09:44 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
If you just replaced the thermo, then you may have an air lock.

Park on a hill incline , remove the cap , run the engine and slowly squeeze the top hose with gloves on to burp the system.
__________________
A Dalton
Reply With Quote
  #10  
Old 04-21-2009, 08:17 AM
EricSilver's Avatar
Registered User
 
Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,322
Quote:
Originally Posted by trektravel View Post
.. water pump at this point....??....

Unclamp the hose at the water pump. Start the car (briefly). If water forcefully shoots out, your pump is working. If it doesn't, it is not.

__________________
2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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 01:30 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page