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Old 05-13-2018, 06:09 AM   #4
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,460
Re: Overheating, tried (almost) everything.

Verify the temp with a laser temp reader or a second temp gauge. Your gauge reading of 250 seems out of bounds as 50/50 antifreeze mix boils at about 234F. Even a new gauge can be bad out of the box.

Didn't see any mention of a new water pump. Possible the impeller suffered some corrosion during the 15yr sit.

What does the flow through the radiator look like with the cap off?

If the heater return is to the radiator, how is it flowing?

Was the air out of the heater hot with the fan on high?

BTW - for a mix-master truck, it looks pretty nice.
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