same prob here...
have a 92 turbo diesel with same problem however alldata site sez the following in a T.S.B. mind you this is for a 92 turbo diesel
Cooling - High Coolant Temperatures
MD-NET ADMINISTRATIVE MESSAGE
DATE: JULY 22, 1994
MESSAGE #: 322
TO: ALL DEALER SERVICE MANAGERS / ALL DEALER PARTS MANAGERS
SUBJECT: GROUP 20 - ALL MODELS, COOLANT TEMPERATURES
The coolant temperature of MB vehicles may rise substantially above 100°C/212°F at high ambient temperatures while the vehicle is:
b) in city traffic ("stop and go")
c) when driving uphill
d) when driving at very high speed, i.e. with high engine load
Engine coolant temperature returns to "normal" upon returning to regular driving conditions. In individual cases, the temperature reading may approach the red field of the temperature gauge.
Provided the cooling system is well maintained and in good working order, such temperature levels do not create any danger for the engine and, therefore, give no cause for concern. The boiling point of the recommended coolant mixture (Refer to Service Information 20/9 and Service Microfiche group 20), is much higher than 1OO°C.
Copyright © 2003 ALLDATA LLC
1994 S-350 6cyl Turbo Diesel 158k
1998 300d 6 cyl Turbo Diesel 143K
1993 2.5 124 Turbo-Diesel 236
1990 2.5 124 Turbo-Diesel 228k
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SOLD 1992 2.5 124 Turbo-Diesel 204k
RIP 1992 124 300 TD 265K OIL PUMP QUIT @ 85MPH