Massive coolant leak

Hello,

I would bet on a completely blown lower intake manifold gasket. These trucks are known for that issue.


Good luck!

Thank you. I am going to look in to it. thanks a bunch and blazer S10 and jimmy and Sonoma all the same of they have 4.3?

Just to jump in on this, yes they are all the same on base engine systems like the cooling system and manifold gaskets.

The best way to confirm this is where the leak is to either have someone pour just water into the system and you try to pinpoint the leak if it is just pouring out.

Otherwise pressurize the system and water for where the water is coming out as it will push the coolant out of the leak until the pressure is gone. Clearly if the leak is bad enough then you will not have much time before the pressure is gone. However, this is not that common to have a leak this bad. If you do then it is normally not that hard to find.

Here is some info that will help with all this.:

https://www.2carpros.com/articles/radiator-pressure-test

https://www.2carpros.com/articles/car-is-leaking-coolant

If it is the manifold, I bet someone had this off and did not apply the proper amount of sealant to seal it properly. The process is below.

Let us know how you make out. Thanks

So it was a hole in the block. so now I have to find a motor for it this GMC is needing work like a Ford.

Oh wow. Well, that will do it. Thanks for the update and coming back to update us on what you found.

Thanks for using 2CarPros.