CAT 22 water temp while running

Kodiak101016

New User
Helping a neighbor bring a cat 22 online. Running
like a champ today. After taking it out for a spin for
10-15 min, we noticed the top cast iron block was
hot to the touch. Sides of the radiator were cool. I
could here the radiator water boiling inside the block
after it was turned off. We replaced the coolant
during fix up with top line 50/50 mix from JD dealer.
My gut tells me a thermostat or water pump issue.
Crazy thing is that the temp gauge barely reads into
the green line. Any suggestions? Thank you for
your time. Matt
 
If the top of the rad is hot and the bottom cold it suggests the rad core is blocked internally,by the rule of thumb the bottom should be about 10/12° lower than the top if the rad is doing its job,the thermostat has to be opening if the rad top is hot but you could check it anyway.
AJ
 

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