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1999 Johnson35 3cylinder temp sensor issue ..

faztbullet said:
What problems are you having?
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Engine ran in the big tub then high temp warning came on .. I didn't have my temp tester handy to check head temp but I know it was pumping water .. These sensors appear to be nonexistent or $300+ if one is found .. Budget is really tight !!
 
racerone said:
The switch can be tested in hot water and say a candy thermometer.
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Ok .. I found that test .. I also remember seeing a Ohm Meter test that could be done before removing the sensor .. This was a cold engine reading .. Engine RPMs will drop if there is a cooling issue ..will unplugging the sensor allow normal speeds to be regained? Providing that the sensor is defective and the engine cooling is OK ?
 
Take a temp gun and check the head temperature at the thermostat housing; just because it's pissing water doesn't mean it's cooling correctly. Before the thermostat opens most of the pee stream comes from the bypass flow. If the thermostat is stuck closed, broken in half, stuck in the bore so it can't open the bypass spring, etc. it'll overheat.

I just had this happen recently to me, still pissed water just fine until it overheated and started boiling the water leading to a spurting stream.
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chrisgt said:
Take a temp gun and check the head temperature at the thermostat housing; just because it's pissing water doesn't mean it's cooling correctly. Before the thermostat opens most of the pee stream comes from the bypass flow. If the thermostat is stuck closed, broken in half, stuck in the bore so it can't open the bypass spring, etc. it'll overheat.

I just had this happen recently to me, still pissed water just fine until it overheated and started boiling the water leading to a spurting stream.
View attachment 33916
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OK .. I'll check this out ! Thanks for the help ..
 
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