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  #1  
Old 01-08-2009, 11:31 AM
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Join Date: Oct 2006
Posts: 55
Overheating c280 w202

Tech question for you...

I've got a 96 w202 c280 w/165k mi. Replaced the thermostat ~10-15k mi ago (~18 months) due to overheating. It hass run fine @ ~90c degrees until recently.

Now it runs in the 105c-119c range (not yet cresting the 120c degree redline threshold).

Important info:
Ambient temp 50f degrees
Both cooling fans appear to be operational (kick on and run low then high as the temp raises and are able to keep it under 120c degrees)
This is a 3rd car and seldom is used
Coolant level is OK
No CEL and no Low Coolant lights

What should I look at first?


Last edited by visioncasting; 01-08-2009 at 11:38 AM.
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  #2  
Old 01-08-2009, 01:26 PM
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Join Date: Jan 2009
Location: California
Posts: 9
When the car is warmed up, have you checked the upper and lower radiator hoses to compare temperature? If one hose is alot cooler than the other, then your thermostat is sticking, and not fully opening.

Other possibility is a clogged radiator, but check the hose temperatures first.
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  #3  
Old 01-08-2009, 02:41 PM
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Join Date: Oct 2006
Posts: 55
Good call.

Good call. I am assuming (possibly incorrectly) that the thermostat is good since it's been recently replaced. But it's probably prudent to give it a check before I start tearing off the much more expensive water pump. Anything else I ought to look at?

Quote:
Originally Posted by Daigo3d View Post
When the car is warmed up, have you checked the upper and lower radiator hoses to compare temperature? If one hose is alot cooler than the other, then your thermostat is sticking, and not fully opening.

Other possibility is a clogged radiator, but check the hose temperatures first.

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