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COOLANT DISAPPEARING


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Laytron3030
New User

Feb 28, 2018, 3:53 AM

Post #1 of 6 (239 views)
COOLANT DISAPPEARING Sign In

So lately I've been losing coolant rather quickly, took it into a shop where it sat 4 days on 20PSI and they couldn't find where it's going either. I've changed the reservoir cap as well thinking the seal went bad. I don't believe it's a head gasket either as the oil is not milky, and there is no visible leaks/drips anywhere. Could it be a manifold gasket? This is keeping me up and night and stressing me out! I'm DESPERATE guys! PLEASE HELPUnsure


Discretesignals
Ultimate Carjunky / Moderator
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Feb 28, 2018, 4:30 AM

Post #2 of 6 (228 views)
Re: COOLANT DISAPPEARING Sign In

Year, make, model, and engine size? How much coolant is disappearing? Have they inspected and tested the radiator cap too? Have you seen any coolant laying on the ground? Does the engine overheat?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Feb 28, 2018, 4:31 AM)


Laytron3030
New User

Feb 28, 2018, 4:51 AM

Post #3 of 6 (221 views)
Re: COOLANT DISAPPEARING Sign In

It's an 04 Chevy Silverado 1500 5.3L V8. It's been going empty about every 4-5 days. There's no overheating going on whatsoever, no leaks on the ground, no liquid anywhere. And yeah no radiator cap on these models apparently.


Discretesignals
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Feb 28, 2018, 5:24 AM

Post #4 of 6 (211 views)
Re: COOLANT DISAPPEARING Sign In

It won't be intake gaskets because coolant doesn't run through the intake on those. It does have a radiator cap, but it is on the surge tank. I've seen a couple that will leak around the thermostat housing that can be hard to find.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Feb 28, 2018, 5:30 AM)


Hammer Time
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Feb 28, 2018, 5:52 AM

Post #5 of 6 (201 views)
Re: COOLANT DISAPPEARING Sign In

I wouldn't be so quick to rule out a head gasket. Milky oil is not a common symptom of a blown head gasket but coolant loss with no explanation is, although that is not a common issue for this particular engine.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
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Feb 28, 2018, 6:18 AM

Post #6 of 6 (195 views)
Re: COOLANT DISAPPEARING Sign In


Quote
Bulletin No.: 06-06-01-019B

Date: June 12, 2007

INFORMATION

Subject:
Information on Gradual Coolant Loss Over Time With No Evidence of Leak Found

Models:
2004-2006 Buick Rainier
2001-2006 Cadillac Escalade Models
2001-2006 Chevrolet Avalanche, Blazer, Silverado, Suburban, Tahoe, TrailBlazer Models
2001-2006 GMC Envoy, Jimmy, Sierra, Yukon Models
2001-2004 Oldsmobile Bravada
2005-2006 Saab 9-7X

with 4.8L or 5.3L VORTEC(R) GEN III, GEN IV V8 Engine (VINs V, T, M, B, Z - RPOs LR4, LM7, LH6, L33, L59)

Supercede:

This bulletin is being revised to include engine RPO L59. Please discard Corporate Bulletin Number 06-06-01-019A (Section 06 - Engine/Propulsion System).

Some vehicles may experience a gradual coolant loss over time. A very low percentage of cylinder head(s) manufactured with an embossed Castech logo may develop a porosity crack in a very specific area.

Inspect the cylinder head assembly to determine if the casting was manufactured by Castech. This can be accomplished by inspecting for their casting logo located on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head.

If the cylinder head(s) are Not a Castech casting, follow normal diagnostic procedures in SI to determine the cause of the coolant loss.
If the cylinder head(s) is a Castech casting (1), inspect the area around the five oil drain holes for witness marks indicating coolant seepage over time (2).

If No evidence of coolant loss is found on inspection of Castech casting cylinder head(s), follow normal diagnostic procedures in SI to determine the cause of the coolant loss.

The crack location can be found in any of the five cylinder head(s) oil drains. This can be seen as a clean or shiny area, on an otherwise stained surface (1). Pressurizing the cooling system at this time may reveal coolant, air, or a combination, weeping in the described area. If inspection reveals evidence of coolant witness marks (1), replace the entire cylinder head(s) assembly.








Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Feb 28, 2018, 6:22 AM)






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