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Old 09-20-2014, 01:22 PM
Join Date: Feb 2005
Location: Santa Maria CA 150mi North of LA
Posts: 671
1995 e320 running hot

I'm pulling my hair out over this car running hot. As long as your moving, it stays normal, but as soon as there is a load on the engine or a long traffic light, the temp creeps up to 110 and kicks on the aux fans. It has been verified that there is no compression leaking into the coolant, it has a new radiator, 50/50 Mercedes coolant and water, a new fan clutch, and nothing has made a difference. What else would you suspect?

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Old 09-20-2014, 05:08 PM
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Join Date: Jan 2012
Posts: 7,515
Pull the thermostat housing and look at the thermostat bridge. It was broken on my 97 C280 leaving the valve partly open but never opening far enough to close off the bypass. On cool days it would run slightly cold, hot days a bit warm mostly at idle.

What ever happens, be sure to post the results to help others.
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Old 09-20-2014, 06:32 PM
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Join Date: Feb 2007
Location: los angeles
Posts: 691
Check your fuse under you fusebox there is a relay that controls low speed of fans and a relay that does high speed green relay and blue relay, my wagon was doing the same and i found low speed was not functioning, and had the same symptom my wagon is a 94
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Old 09-20-2014, 06:41 PM
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Join Date: Dec 2005
Location: Carson City, NV
Posts: 3,789
Have you verified the temperature readings with an IR thermometer?
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

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Old 09-20-2014, 06:50 PM
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Thermostat with broken bridge pic
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Old 09-21-2014, 03:52 PM
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Join Date: Nov 2008
Location: Goodyear, Arizona
Posts: 162
I've had EVERY problem that one can have with overheating...

There are two W124s in my garage, both are currently normal.

#1. Make sure you "burp" your cooling system. Disconnect your upper radiator hose and fill it wth distilled water, preferably while on an incline.

#2. Make sure your cooling fans are plugged in properly. My 91 300TE was wired can happen!

#3. Thermostat...change it. Always have three floating around and anyone can fail and still look like its perfect.

#4. Water pump...yep...had one fail.

#5. Fan clutch.

#6. Do all the easy ones first...its probably one of those. Good Luck!

I have never met a man so ignorant that I couldn't learn something from him. -Galileo Galilei, physicist and astronomer (1564-1642)
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