5.3 overheat issue

zayne2427 · Apr 7, 2017

Rode last weekend and had an overheating issue. Few weeks back I changes out the mechanical temp gauge and temp sensor in bottom of the block. I know I lost a ton of coolant and of course entered air. Long story short not sure if I still have an air issue or something more sever like head gasket. All the head gaskets I've seen is a steady flow of bubbles.
Anything below 190 and no bubbles at all ( thermostat closed) above 190 and bubbles are slow and then above 205 it's like a dang volcano. But as soon as I turn the fan back on it immediately quits. Never seen one do this. I let it go through several cycles over an HR period of idleing.
https://youtu.be/bmZRY_P-jeY

pholmann · Apr 7, 2017

Head gasket or head.

zayne2427 · Apr 7, 2017

Damnit..... Thats what I figured... Rebuild or 6.0
This motor is supposed to have an ls6 cam, springs, tune, and new crank.

pholmann · Apr 7, 2017

stock 6.0 over a built 5.3 for me.

kmcminn · Apr 8, 2017

Dang that sucks

zayne2427 · Apr 8, 2017

Yeah it's been a heck of a week and. My luck has to turn around eventually

zayne2427 · Apr 8, 2017

Sure wish I knew someone that could find me a 6.0 reasonable... Cough..Cough..

kmcminn · Apr 8, 2017

zayne2427 said:
Sure wish I knew someone that could find me a 6.0 reasonable... Cough..Cough..

These things eat 100s like lays chip.

zayne2427 · Apr 8, 2017

I wish mine ate 100's. Seems like every time I turn around I'm dropping 1000's

Jduck · Apr 8, 2017

zayne2427 said:
Rode last weekend and had an overheating issue. Few weeks back I changes out the mechanical temp gauge and temp sensor in bottom of the block. I know I lost a ton of coolant and of course entered air. Long story short not sure if I still have an air issue or something more sever like head gasket. All the head gaskets I've seen is a steady flow of bubbles.
Anything below 190 and no bubbles at all ( thermostat closed) above 190 and bubbles are slow and then above 205 it's like a dang volcano. But as soon as I turn the fan back on it immediately quits. Never seen one do this. I let it go through several cycles over an HR period of idleing.
https://youtu.be/bmZRY_P-jeY

Did it overheat before changing the temp sensor?

zayne2427 · Apr 8, 2017

I believe it was running warm before. I didn't have 45 min run time on the buggy before I tore it down and started upgrading everything.

Beerj · Apr 8, 2017

pholmann said:
Head gasket or head.

Just out of curiosity, is it the constant stream of bubbles that makes you say that or the coolant geyser?

zukimaster · Apr 8, 2017

Sounds like to me it would be a lot cheaper to just pull both heads and have them checked and put new gaskets on and rock out! Especially since it's already cammed and tuned for that setup. :dunno:

zayne2427 · Apr 8, 2017

zukimaster said:
Sounds like to me it would be a lot cheaper to just pull both heads and have them checked and put new gaskets on and rock out! Especially since it's already cammed and tuned for that setup.

Yeah I'll prob do that first

whiskeymakin · Apr 8, 2017

Curious what year it is? I think the 04-05 range had the Mexican cast heads on most. Known for cracking around a few of the bolt areas.

zayne2427 · Apr 8, 2017

I talked with Ben that built it and he said it was from an 04 with 60,000 miles when he put it in.
Installed an ls6 cam, bee hive springs, tune, and put a crank in it

tonybolton · Apr 8, 2017

Coyote motor swap ;D

Sent from my SM-G930R4 using Tapatalk

zayne2427 · Apr 8, 2017

Whatever I do will have a few more ponies that what I did have. I was planning on putting a turbo on this motor... Plans change though. Just another bump in the road

zayne2427 · Apr 8, 2017

30k when installed...

natedawgxj · Apr 8, 2017

whiskeymakin said:
Curious what year it is? I think the 04-05 range had the Mexican cast heads on most. Known for cracking around a few of the bolt areas.

Drain the oil if its chunky thats the heads... :****: