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Old 08-28-2002, 09:13 PM
OneBadViper's Avatar
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Join Date: Feb 2002
Location: Way Down South
Posts: 143
Question What Temp Is Normal For My 93' 500sel?

What temp is normal for my 93' 500SEL to run? Can a lower degree Thermostat be used? If so, which one and where to buy?
Also, what degree is the stock Thermostat?

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Old 08-28-2002, 09:28 PM
blackmercedes's Avatar
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
A few things:

1. If it is running too hot, simply replacing the thermostat might do the trick, as the OE one might be broken.

2. Running at a much lower temp than the engine/emissions is designed for will be harmful and cause premature engine wear.

3. MB temp gauges are REAL. You should be 83-95C in warm highway driving and 95-100C in hot stop and go driving. Some M119 equipped cars (like your 500SEL) will run warmer, and there is an aftermarket fan mod that will bring temps down a bit, and it seems to work well. Don't look at the temp gauge in a Japanese car to determine that it doesn't change during driving. Their gauges are calibrated to make you believe that the engine runs about the same temp regardless of conditions.

4. I think (maybe be wrong) that most modern MB engines have their thermostat calibrated for around 87C. But, the temp has MANY variables including ambient temp, AC operation and driving conditions. Hitting 105C in heavy traffic on a 35C ambient day is not unusual, and will not harm your car in any way.
John Shellenberg
1998 C230 "Black Betty" 240K
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Old 08-28-2002, 10:42 PM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Originally posted by blackmercedes
Hitting 105C in heavy traffic on a 35C ambient day is not unusual, and will not harm your car in any way.
True that! Well said John Shellenberg.
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 08-29-2002, 01:07 AM
JimF's Avatar
'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,929
Just changed my Tsat

on my '94 S500 and it was not marked. It was partially stuck open!

Data says it supposed to be 185F (82C) but the replacement was marked 80C. I'd recommend that as a good replacement value.

Re temps and how-to-lower-them, read these threads. Good reading if nothing else. M119 Viscous Fan mod & problems with aux. fan resistor-mod

This thread 'attacks' the the 'dormant' viscous fan clutch:
High engine temps SOLVED!
Regards . . . . JimF
'94 S500 Cpe

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