Did they intall a new thermostat?

The high speed fans come on at 105-107 C. The thermostat start opening around 87-90 C. The new thermostat maybe opening a little bit later than the previous one.

The temperature in my 94 E320 started to stay a little below 80 C on cold mornings, replaced the thermostat and now it is always above 80 C and gets close to 100 C in city traffic.

You maybe able to lower the temperature by turning on the AC, as the pressure on the system turns on the fans at low speed regardless of coolant temperature.

According to MB, temperature approaching 120 C are normal in certain load conditons.




"Air Conditioning - During periods of extreme engine load (climbing hills or towing) along with high temperatures, use of the A/C may exceed the capacity of the cooling system.

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."

__________________
Zafar
94 E320 58000 Miles