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:

a) stopped
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.

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RIP 1992 124 300 TD 265K OIL PUMP QUIT @ 85MPH