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Old 05-13-2018, 03:55 PM   #8
dagnabbitt
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Join Date: Dec 2014
Location: Edmonton Alberta
Posts: 1,287
Re: Overheating, tried (almost) everything.

Quote:
Originally Posted by Dead Parrot View Post
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.
When I pulled over you could hear it boiling in the top hose, its pretty hot. I have verified the temp with laser.

The air out of the heater was very hot, with fan on high.

With the cap off, engine warm, you can see nice flow through the rad. That's why I was hesitant from the start to replace it. But I am down to just a couple more possibilities here.

I will check the heater return to the radiator. All hoses are very hot, though, so I believe that the flow is there.

And thanks, its a bit of a head turner, I have a few other project trucks but it is my hope that this one be my daily driver, so I am anxious to maximize my summer driving time with it.
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Edmonton, Alberta
1959 Apache
1967 K20
1968 C20
1970 C10
1972 GMC 2500
1981 C10

Last edited by dagnabbitt; 05-13-2018 at 03:59 PM. Reason: adding info
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