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Coolant Loss

cao88c

By cao88c
in Ask A GM Technician

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cao88c Enthusiast

cao88c

Posted
Posted

Hey guys,

 

My 1999 Suburban (5.7; 4x2), has been losing coolant since early March. The radiator was leaking, so that got replaced, then this past weekend, I noticed the water pump leaking and replaced it as well. With the new radiator went two new hoses (upper and lower).

 

Now, I filled up the overflow tank to the cold mark (engine was cold). And this morning (on an 80+ mile drive on the highway), the coolant in the overflow tank is gone. When I opened the hood, I was expecting to see it filled up a bit more since the engine was hot.

 

BTW: I checked the tank itself, and no leaks, also the hoses leading into the tank have no leaks. I also checked the oil, and no coolant in the oil. I'm stumped!!

 

Any and all help is appreciated

Norseman Senior Enthusiast

Norseman

Posted
Posted
Hey guys,

 

My 1999 Suburban (5.7; 4x2), has been losing coolant since early March. The radiator was leaking, so that got replaced, then this past weekend, I noticed the water pump leaking and replaced it as well. With the new radiator went two new hoses (upper and lower).

 

Now, I filled up the overflow tank to the cold mark (engine was cold). And this morning (on an 80+ mile drive on the highway), the coolant in the overflow tank is gone. When I opened the hood, I was expecting to see it filled up a bit more since the engine was hot.

 

BTW: I checked the tank itself, and no leaks, also the hoses leading into the tank have no leaks. I also checked the oil, and no coolant in the oil. I'm stumped!!

 

Any and all help is appreciated

 

Intake Gasket.

cao88c Enthusiast

cao88c

Posted
  • Author
Posted

Allright, thanks.

 

How hard is that to do? Is there a writeup somewhere that will detail how to do that? My area of expertise is axles. I've never got that far into tearing down an engine, but I'm sure that with a little guidance I can figure it out. Also, if theintake manifold was leaking, where does that fluid go that I don't see it or smell it?

 

Thanks again.

cbxeric Enthusiast

cbxeric

Posted
Posted

I'd re-fill the reservoir and see if it does it again. It could be just burping out some air caught in the system. That's a lot of coolant to lose through a head gasket and not notice white smoke (steam) on start up or missing.

jeffinwaxahachie New Member

jeffinwaxahachie

Posted
Posted
Hey guys,

 

My 1999 Suburban (5.7; 4x2), has been losing coolant since early March. The radiator was leaking, so that got replaced, then this past weekend, I noticed the water pump leaking and replaced it as well. With the new radiator went two new hoses (upper and lower).

 

Now, I filled up the overflow tank to the cold mark (engine was cold). And this morning (on an 80+ mile drive on the highway), the coolant in the overflow tank is gone. When I opened the hood, I was expecting to see it filled up a bit more since the engine was hot.

 

BTW: I checked the tank itself, and no leaks, also the hoses leading into the tank have no leaks. I also checked the oil, and no coolant in the oil. I'm stumped!!

 

Any and all help is appreciated

 

there is a coolant hose on the tope right front of the intake that is famose for leaking it has a fitting that is a pain to remove but cut it off and put what i think was a 3/4 fitting in its place and used a clamp on the hose where i cut it off i hope this helps

Norseman Senior Enthusiast

Norseman

Posted
Posted
Allright, thanks.

 

How hard is that to do? Is there a writeup somewhere that will detail how to do that? My area of expertise is axles. I've never got that far into tearing down an engine, but I'm sure that with a little guidance I can figure it out. Also, if theintake manifold was leaking, where does that fluid go that I don't see it or smell it?

 

Thanks again.

 

Here ya go.

 

Hope this helps.

57IntakeManifold.pdf

57IntakeManifold.pdf

57IntakeManifold.pdf

57IntakeManifold.pdf

cao88c Enthusiast

cao88c

Posted
  • Author
Posted

Thanks to all that responded. Norseman, thaks for the PDF, it should really help out. Good to know that there are an awesome group of people willing to help out. I'll sure come back with any questions I may have.

 

Thanks again. :thumbs:

Norseman Senior Enthusiast

Norseman

Posted
Posted
Thanks to all that responded. Norseman, thaks for the PDF, it should really help out. Good to know that there are an awesome group of people willing to help out. I'll sure come back with any questions I may have.

 

Thanks again. :lol:

 

 

No Prob anytine :lol:

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