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Again for emphasis.
Mercedes Engine Coolant Temperature.
It is normal for the temperature gauge to read close to 120C after coming to a stop for a few minutes with engine running, especially in high ambient temperatures.
Provided the coolant is not being discharged from the system, this can be concidered normal providing the coolant temperature drops to 80C to 90C back on the road.....or words to that effect.
I have seen many customers vehicles running slightly higher temperature readings of over 80C on the road and at the White mark on the gauge in the shop.
If the thermostat is operating normally and there's no coolant loss, you may have a gauge or sender lying to you.
If possible, stop by someone with a RAYTEK infra red temp' gun and check the rad' and stat housing....you may find the temperatures lower than indicated.
BTW....has this happened lately ?
If this has always been the case, the old coolant pump may have gouged out the front of the block and have increased clearence between the impeller and block face.
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