Date registered: Dec 2004
Vehicle: 300TE 4-Matic 300GD
Location: Oslo Norway
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RE: Engine Temp Rising
Hi Old Mil.
What you have experienced is very common. And not always a problem. It depends on the customer, and if he or she notices or not. In your case it's probably still connected with your thermostat.
Many shops get in cars with an abnormal engine temperature all the time, without any comments or worries from the customers. Very many owners wouldn't notice a 10 degree rise. As long as nothing goes into the red, or warning lights start shining. And their cars keep coming in for service without any major problems, year after year.
When you watch this pattern for years, it's only natural letting these cars pass through service without doing anything about it. And MB does have a rather wide acceptance range concerning coolant temperature.
Anyway, I think if a car has had a certain temperature in the past, it should have the same in the future. But, then again, I'm sort of picky.
Air pockets in the cooling system, or a bad thermostat is my tip. Sometimes, in Norway at least, if a dealer has to pay for the part, he might use a cheap unoriginal one just to get the problem out of this world.