There is no need for the hole in the thermostat with the M42. There is a reason that it does not have one. That reason is the little bypass groove in the thermostat housing that connects the two cavities. It is VERY common to have it so completely blocked up with corrosion that first-timers don't even know it is there.
You could have a big air bubble in the head that is sitting at the sensor. You could also have a jammed up radiator or other passage. Was the water pump you replaced totally busted? Maybe the thermostat got installed backwards (it is pretty a pretty common mistake)?
You could have a big air bubble in the head that is sitting at the sensor. You could also have a jammed up radiator or other passage. Was the water pump you replaced totally busted? Maybe the thermostat got installed backwards (it is pretty a pretty common mistake)?
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