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5.3 getting hot. On 68 degree day

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Old 05-31-2020, 07:02 AM
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Originally Posted by RB04Av
Doesn't matter if "it works" for one situation or not. It's not right. Cheeeeeeeeep and eeeeeeeeeeezy to make it better.

Undo the "looped" heater circuit. It allows hot water to pass directly from the top of the engine right back into the "cooled" side. Kinda the same effect as, if your radiator was just a piece of hose.
Thats not the problem. So a heater works in some situations but not others? A loop is a hose without a heater core. Not the problem.
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Old 05-31-2020, 07:05 AM
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Originally Posted by Jake33
You really think that's my problem
No.

It's probably not air either. If you don't want to worry about air in the system drill two 1/8" holes in the top of the thermostat.

When does it get hot, sitting? driving? What running condition makes it run hot?
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Old 05-31-2020, 07:07 AM
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Are the head gaskets on the correct side?
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Old 05-31-2020, 08:04 AM
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Get rid of the loop.

What it creates is, a hose that carries hot water out of the hot side of the motor, right straight back into the cold side, without passing through the radiator first. However much of the coolant that passes that way, DOESN'T GET COOLED.

Read that carefully: some part of the coolant DOESN'Y GET COOLED. How can this NOT be a bad thing?

May not be "The Problem", but it's SURE AS HELL not part of the solution. Whatever The Problem is, that's making it worse.

OTOH, it just MIGHT BE The Problem.

Try it and find out.
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Old 05-31-2020, 09:35 AM
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If it had a heater it would be running stagnant through a heater core instead of a loop of hose. It doesn't matter. Paint the water pump neon green that might help too.
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Old 05-31-2020, 09:57 AM
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Originally Posted by BigBlackCamaro
No.

It's probably not air either. If you don't want to worry about air in the system drill two 1/8" holes in the top of the thermostat.

When does it get hot, sitting? driving? What running condition makes it run hot?
All the time I can idle it. Hets hot or driving

I had one wierd thing happen. All a sudden it dropped to 160. Then when back up slowly

Maybe it is air.
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Old 05-31-2020, 10:21 AM
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Do you have the factory air dam in front that directs air into the radiator while driving?
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Old 05-31-2020, 10:41 AM
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Just clamped heater hose. No luck same thing


I do not have air dam
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Old 05-31-2020, 11:02 AM
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A lot of people have had their cars run hot when the air dam is removed, and have run cooler with one installed.
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Old 05-31-2020, 01:47 PM
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Hooked up the coolant temp sensor. Says 90 degrees. Hooked up to msd box. To way not correct
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Old 05-31-2020, 08:39 PM
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Replaced water pump drilled holes in thermastat. Next. Leak down check.. all that's left

Thanks for the hel .
ANYONE RUN THESE


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Old 05-31-2020, 09:42 PM
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I wouldnt buy them, but I have no experience with them.
Stock 243's work great, and I would actually run 706 heads for the extra compression
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Old 06-01-2020, 12:39 PM
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Leak down check is good so my next step is I'm gonna pick up the radiator about a foot maybe its having a problem on top hose since radiator is so low. If that dont work I'll have to get a dummy radiator and switch them out even though mine is brand new
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Old 06-01-2020, 08:25 PM
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So all I can say is. Maybe my steel lower pipe is to close to exhaust. That's all I got.
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Old 06-01-2020, 09:45 PM
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No way that would radiate that much heat into the hose to overheat the engine like that. What does it do when you drive it down the street?

From your previous post, are you saying it gets hot only when driving or only when idling?
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Old 06-01-2020, 10:47 PM
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Originally Posted by Ls7colorado
No way that would radiate that much heat into the hose to overheat the engine like that. What does it do when you drive it down the street?

From your previous post, are you saying it gets hot only when driving or only when idling?
It gets hot all the time. cold start it keeps going to 240 degrees. Never goes down or anything
I can see the water moving
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Old 06-01-2020, 10:50 PM
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Heres the water pushing out top of water pump that goes to top radiator.
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Old 06-01-2020, 10:51 PM
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Originally Posted by Jake33

Heres the water pushing out top of water pump that goes to top radiator.
Almost feels like it is backwards
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Old 06-01-2020, 11:47 PM
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Is your water pump turning backwards...???
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Old 06-01-2020, 11:52 PM
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5.3-4.8 Truck belt routing...
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