Coolant problem

[Bjoh24]

Idk what is going on but when I fill up my reserve tank with antifreeze to the correct level it ends up spraying out of the overflow. Especially when I haul something and the motor is working harder. Idk what would cause that or how to fix it. I've been running it low bc otherwise it ends up all over the side of the truck but my temp stays normal.
Any ideas why it would create that much pressure to spray 1/2-1 gallon of coolant out the overflow?

 

[IOWA LLY]

Head gaskets. Or could be injector cups if it's an LB7.


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[TerryRH]

Definitely not what I wanted to hear. I think something's going funky with mine too.

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[Chevy1925]

HG, failed injector cups, cracked head or block, or a faulty radiator cap.

 

[JRein]

Wishful thinking would be a radiator cap which you could test but prepare for the worst.

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[Bjoh24]

Damn.... Okay, thanks for the heads up guys

 

[aashton1206]

In the morning check to see if you coolant hoses are hard


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Yellow Top Optimas, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.

 

[Bjoh24]

They're not

 

[aashton1206]

Imho it sound like a lifted cup


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Yellow Top Optimas, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.

 

[IOWA LLY]

Imho it sound like a lifted cup


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Yellow Top Optimas, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.

Agreed. Soft hose in the morning means injector cup, cracked head, or your just getting old......


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[Bjoh24]

Great... so plan on dropping a bunch of money huh?

 

[2004LB7]

https://www.industrialinjection.com/pdm-07021k

https://dmaxstore.com/products/?route=product/product&path=37_280&product_id=1857

You can probably get one of the vendors here to hook you up

 

[Bjoh24]

I have a strictly duramax mechanic my friends have used that is charging around $3500 or to get Apex studs $3900 if head gasket(s)... is it worth spending the extra $400?

 

[IOWA LLY]

Yes it's worth the extra money. That's a good price for the job if he's doing all the proper machine work to the heads.

Verify that he is sending them off to a machine shop to be checked, surfaced, and a valve job. If not, find someone else.


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[Bjoh24]

He is... I already made sure of that. But yeah, supposedly he's the cheapest and one of the best around but he's a cash/check only shop.
But thank you for your reply bc idek what he was talking about hah.