Thread: Bad thermostat
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Old 01-15-2006, 10:31 AM
Brian Carlton Brian Carlton is offline
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Join Date: May 2002
Location: Blue Point, NY
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Quote:
Originally Posted by pawoSD
We drained the system entirely so we could disconnect all the climate control hoses, the system was open at the little return pipe from the aux pump, the output port on the side of the engine, and the drain plug was out the whole time. I refilled it with MB coolant, the thermostat just seems to be stuck. If we can't get it to reliably open we'll probably just replace it....
As you noted on the other thread, the system has air entrapped. The thermostat is almost certainly not the culprit here. A thermostat does not go bad because you decided to replace the stabilizer bar. The SD sat for five months with the cooling system open and the thermostat didn't care one bit.


As noted on the other thread, remove the upper radiator hose, fill the head and the hose with coolant and reconnect the hose, losing as little coolant as possible.

Also, as noted by Raymond, there is a small bypass tube between the head and the water pump on the front of the engine. Make sure that it is flowing coolant properly. You'll need new aluminum crush washers, most likely, if you remove it.
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