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ML builds an old truck

Started by Monsterlover, March 19, 2021, 07:59:32 PM

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Monsterlover

#705
June 10, 2026, 04:35:25 PM
Overheating has been further diagnosed. It's not an air flow problem, at least not entirely.

It's a liquid flow issue.

For fun I hose clamped a meat probe on the aluminum tubes in the bed that are the radiator inlet and outlet.

At idle with the thermostat open the inlet is hotter than the outlet, by a small amount.

When I'm driving the flow is reversing/stagnating/slowing down. There radiator OUTLET is like 30° hotter than the inlet.

Further research on trophy and drift trucks with bed mounted radiators show they all use high GPM coolant pumps to overcome the tubing to and from the radiator as well as the vertical distance up into it.

I'll be installing a 55gpm inline booster pump on Friday. Hoping this helps things. I don't see how it can hurt.
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

Monsterlover

#706
June 12, 2026, 06:16:05 PM
Well, spent all day putting this pump in. It has definitely helped but the truck still runs hot.

Possible that there is still some trapped air in the system.

In the meantime we have decided to test the air temp where it's entering the radiator to see if it's continually increasing in temp.

My radiator outlet is still hotter than the inlet and we're wondering if it's actually picking up heat vs rejecting it.

Time to gather more data.
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

ducpainter

#707
Today at 09:21:27 AM
Quote from: Monsterlover on June 12, 2026, 06:16:05 PMWell, spent all day putting this pump in. It has definitely helped but the truck still runs hot.

Possible that there is still some trapped air in the system.

In the meantime we have decided to test the air temp where it's entering the radiator to see if it's continually increasing in temp.

My radiator outlet is still hotter than the inlet and we're wondering if it's actually picking up heat vs rejecting it.

Time to gather more data.
How about something like this to assure there's no trapped air?

https://www.harborfreight.com/cooling-system-test-and-refill-kit-64985.html?hftm_sc=3212&hftm_source=google
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Monsterlover

#708
Today at 09:49:25 AM
Quote from: ducpainter on Today at 09:21:27 AMHow about something like this to assure there's no trapped air?

https://www.harborfreight.com/cooling-system-test-and-refill-kit-64985.html?hftm_sc=3212&hftm_source=google

Might help but driving it seems to be doing the trick.

As an experiment yesterday I moved my meat probes. I put one halfway between the radiator and the bed floor. I put another one outside the bed to get ambient air temp. I took it for a drive and the air under the radiator was only ever about 10° above ambient.

But on this drive, ambient was 10° hotter than when I brought it home. After the water pump install. I did not see it past 218°. It should have been super hot but it wasn't. It fluctuated between 211 and 218 during normal driving.

Additionally, the fluid level in my expansion tank dropped some after it cooled off yesterday afternoon and I was able to check it.

I need to drive it more and under more temperature conditions, but I am slowly starting to think I might be okay.

Further reading about where LS engines like to run shows that 220 is well within a normal range.

Corvette guys are saying they are regularly hitting 230 to 235 on a stock engine.

I know they're designed to run hot for emissions reasons. Personally I feel like 220 is on the warm side, but the more I see in my own vehicle and the more I read I'm starting to think that maybe that isn't too hot after all.
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

Howie

#709
Today at 11:24:11 AM
220 isn't a problem.  Your 14 psi radiator cap raises the boiling point by about 40 degrees.

My Miata, according to the car's gauge runs 220. 
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