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  #1  
Old 02-20-2001, 11:14 PM
HGLett
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Hello -

I have a 1995 S500 with 53k miles. The car runs excellent, however, I have a few questions with respect to "normal" operating temperature. The conditions I notice are as follows:

1) During prolonged idling in traffic coolant temp approaches 100C at ambient temp of 50F.(The electric fans do not turn on as I assume the engine is not hot enough)

2)While driving (moving) the coolant temp is stable just above the 80C mark.

I am new to the S-Class and do not remember my prior 300E reaching 100C at such a low ambient temperature. I know that the thermostat is 80C which tells me that at anything above 80C means that the full cooling capacity is being used due to the fact that the thermostat is allowing full unimpeded coolant flow. Also, I expected that since the engine is all Aluminum (higher heat conductivity)the engine would run cooler not to mention the high oil capacity. Needless to say I am confused:

Should I be nervous idling in traffic and believe my thermostat is sticking or are these observations normal?

Any response would be appreciated since I have not even reached the 90F days with the AC on in traffic.

Hopefully I will soon be able to sleep better and not think that I am a heartbeat away from burning up a Mercedes 5 liter engine.

Thank you in advance -

Hynek
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  #2  
Old 02-21-2001, 12:55 AM
Ali Al-Chalabi's Avatar
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Join Date: Nov 2000
Location: Knoxville, TN
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These temp conditions sound normal. Regardless of the fact that the thermostat is allowing full coolant flow, the fans do not kick in until higher temps. The engine-driven fan will not be fully locked until the temp starts to approach 95-100C. Also the aux cooling fans do not turn on high until around 110C and cycle on and off on low speed according to refrigerant pressure.

I would not worry about anything unless the temp is getting hotter than that. The cooling system will not be doing everything it can in slow traffic with all the fans blasting away as hard as they can until around 110C.
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  #3  
Old 02-21-2001, 04:18 PM
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Join Date: May 1999
Location: Burnaby, BC, Canada
Posts: 960
It's normal

W140s run at "hot" temperature. As long as the needle is NOT in redzone constantly, there shouldn't be any worry at all.

My W140 runs at 110C in hot summer day, with A/C on....

Andy Kuo
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  #4  
Old 02-21-2001, 06:55 PM
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Location: San Francisco
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I recently purchased a 95 S420 and it constantly operates at 80C in any traffic condition - if that helps.
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Old 02-22-2001, 12:47 PM
Davis Lo
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Mine W140 is same as akry's 400SE. In hot summer(> 86F), the temp can be as high as 110C! Since it doesn't reach the red zone, I suppose that is normal...Just me opinion.
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Old 02-23-2001, 03:47 AM
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jimSF,

Does your S420 runs at and/or around 80C constantly?? Mine usually runs at 95-100 no matter what the outside temp is, and will run at 110C constantly in a hot day...

Andy Kuo
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  #7  
Old 02-23-2001, 11:29 AM
Davis Lo
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When my S320L was just 1 year old, it used to run at around 80 c.(75 in highway & 85 at go-and -stop traffic). However, it may not be good for the engine to run at that low temperature as the engine components are not working at their optimal temp. that may increase the wear of them. As a result, I got the 72c thermostat replaced by a 87c one to make sure my engine is running happily.
Just my opinion...
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