Hi,
My 1980 240 DL has been overheating (boiling radiator). This happens after a few miles of driving (10 miles) even on flat freeway in not very hot weather.
The fan runs fine, and I can feel it pushing hot air backwards (testing this only when standing still, of course). So I guess it's not the fan clutch.
For further testing, I have disabled the thermostat, meaning that I have clipped out the valve completely so that now the thermostat is always completely open (there is just a hole where the valve was (since I've clipped out the valve).
Still overheating!
So I guess the next things to test are:
- Is the radiator completely blockec?
- Is the water pump defective?
Any suggestions for simple tests for those? I'd also be happy for any other suggestions for how to go about solving this problem.
Thanks, Wolfgang, Santa Barbara, CA