Quote:
Originally Posted by FrodeS
Perfectly normal.
The fan will start somewhere a little over 100C. Therefor, at a stand still, you basically have no cooling until the temp goes a little over 100C. If it continue well past 100C you shuld have things checked.
I had to replace the radiator on mine, as it was clogged.
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I dont think this is quite right. You have plenty of cooling at a standstill...all that water running through a healthy cooling system is plenty to keep the car cool at idle.
Unless you have your foot on the brake and revving it to 3k for minutes at a time in drive...then there's no helping you :-)
On a W123, if your cooling system is 100% healthy you should experience little to no fluctuation in coolant temperature unless you are in a constant high load situation - like going up at a steep hill at 65mph for minutes at a time. Or AC is running on a really hot (90 degree +) day sitting in traffic.
Id suggest buying an IR thermometer at Harbor Freight to verify the head temperature. I have replaced the temp senders on both of my 123's because they drift up over time and read higher temps than they should.
If all things are working right - including the temp sender, and there is a correct 80C thermostat installed - the temp should be around 83-87C on the dash.