| Engine Runs Hotter than usual [message #335080] |
Fri, 13 July 2018 21:12  |
captjack
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma:
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I set off on a trip the Canada to join GMC 49'ers on a rally to the Canadian Rockies.
10 miles down the road I noticed that the engine was running around 10 degrees hotter than usual and would spike into the 205 region and it wasn't hot outside. Normally it would be running around 185 to maybe 195.
I took a recent trip up the coast and it was running as usual, so this is a sudden change.
So, cancel the trip or fix it quickly. The work evolves:
So far I've checked the fluid - full to the top.
Concerned that the thermostat was bad - replaced it with a Robertshaw I purchased from Jim K - little change
Concerned that the temp sensor had failed - replaced it, little change.
Checked the lower radiator hose to see if it had collapsed - it was good.
The water pump is not leaking.
The fact that this came on suddenly has me thinking it isn't something like the radiator clogging.
Anyway, I'm hoping for suggestions as to what to do next. New radiator and water pump come to mind unfortunately.
Oh GMC Gurus, Save me and my trip with your advice!
Thanks,
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
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