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Old 04-07-2001, 04:13 PM
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213 K miles on MB 300TD. Have owned since Dec. Replaced Valve seals, Alternator, Belts, and AC compressor.

Now having first warm weekend and have temp gage rising at idle to over 100C I am sure this has been asked before in this forum.

Pertinent background looks like a DIY shade tree mechanic with channel locks replaced the water pump. They barked up fan bolts so bad canít get socket on them. Car does not consume oil. So not sure if the past presumed overheating problem lead to ring damage...Also appears to be loosing coolant but without obvious leaks.

Let's check the possibilities

Clutch on fan
Head gaskets, booo

Please let me know if for instance there is some thermostat, solenoid or bypass valve or some such that I am not aware of.

Also help me set the priority on the first likely /least costly paradigm that I should try on this problem.


Stephen Porter

but histor
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Old 04-07-2001, 06:33 PM
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Join Date: Mar 2001
Posts: 326
Hey Stephen,
How much coolant is your car using? There is a possibility that the previous owner overheated the engine and caused major damage, but let's not focus on that yet.
First I would check the cooing system to ensure that there is no air trapped in the system. Do this by removing the temp sensor on top of the t-stat housing, cold eng, res cap removed. If no air is trapped in the system coolant will be immediately present.
Next I would test the t-stat. It may be partially stuck closed.
Scott Diener
89 300E
93 300E
92 Volvo 740 Wagon aka "Mutt mover"
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Old 04-07-2001, 09:03 PM
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Join Date: Jan 2001
Location: Tucson, Arizona
Posts: 758
Replace the Thermostat


Almost all overheating problems, or excessive heat in cooling system ends up referring to a few basic parts. The first and cheapest is the thermostat. Just change it, and if the bolts are as bad as you say, file down the sides until the next smaller size socket will fit, then replace them with the thermostat. If you water pump is failing you will see antifreeze seeping from the weep hole on top of it's housing, that's why they drilled the hole there for, to tell you your pump seals are toast. The last item would be a head gasket leak which would show mostly white smoke during operation at idle, regardless of engine being warm or cold, more pronounced before operating temps, because coolant is trapped in the block until the thermostat opens.
My best guess is that the thermostat is not OEM and has failed. Order the thermostat off Fastlane before you start your dissassembly, so you can go ahead and change it out.

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Old 04-08-2001, 07:59 AM
Posts: n/a
Water Temp

Charles Will try the thermostat route first thanks

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Old 04-08-2001, 08:54 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
Check the electric aux. fan first.
Could be a simple as a fuse.
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Old 04-08-2001, 09:41 AM
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Join Date: Sep 1999
Location: Cremona, Alta, Canada
Posts: 263
A lot of cooling problems especially on older cars is a plugged radiator either inside or out or both. When you have the coolant drained it would be worth while to pull the radiator out and have a look.
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel
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