Quote:
Originally Posted by ArkyDoodle
I'm experiencing a strange situation with my temp gauge on my 85 300D....When I first start it up, the gauge shows cold (below the 40*C mark) and I've watched it quickly climb to about 100*C (as expected) over the next few minutes. (cut)
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That is not what would be expected for a normal engine, the temp should rise to somewhere between 80 C and 85 C then stay there unless you are driving up a steep hill or carrying a heavy load.
The sensor is the first thing I would suspect. A bad ground will be flaky all the time, you do not have symptoms of a bad ground.
The temp you want to check is not the radiator but the thermostat housing. If it is indeed hitting 100C, which could occur of the thermostat was sticking, then the housing will be very hot. And the head will likewise get very hot very quick.
I believe the thermo sensor is on the head, not the thermo housing. At least thats where it is on my 123.