2006 gmc coolant leaking - Chevy and GMC Duramax Diesel Forum

04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 12 (permalink) Old 08-27-2010, 06:16 PM Thread Starter
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2006 gmc coolant leaking

my brothers gmc duramax is leaking coolant its tuned with a tune from duramax tuner and just started leaking and we cant tell where its from , any ideas?

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post #2 of 12 (permalink) Old 08-27-2010, 07:06 PM
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Any more details you can give?

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post #3 of 12 (permalink) Old 08-27-2010, 07:18 PM
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If it's not coming out where it can be seen, perhaps it is internal, like a head gasket, or the EGR cooler. I'd check the later before the former. EGR cooler before head gaskets.

Any sign it's going out the exhaust? How much are you loosing? Can you smell it in the engine compartment? What HAVE you checked?

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post #4 of 12 (permalink) Old 08-30-2010, 07:35 AM
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I have something not quite similar. i have a cooolant leak ever so slight. on the garage floor over night i see a puddle. at first I thought it was condensation from the AC. But then i noticed it was not evaporating like water should. it did feel a bit oily to the touch but does evaporate as the day goes by.
I did notice the DS Rad hose collapses after it is shut down for a while say about 3 hours or so.
I noticed the reservoir for coolant was slightly below the cold mark.
any tips on where i could start looking?

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post #5 of 12 (permalink) Old 08-30-2010, 07:46 AM
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Quote:
Originally Posted by Storm59 View Post
I have something not quite similar. i have a cooolant leak ever so slight. on the garage floor over night i see a puddle. at first I thought it was condensation from the AC. But then i noticed it was not evaporating like water should. it did feel a bit oily to the touch but does evaporate as the day goes by.
I did notice the DS Rad hose collapses after it is shut down for a while say about 3 hours or so.
I noticed the reservoir for coolant was slightly below the cold mark.
any tips on where i could start looking?
I'd start by cleaning the degas cap in some hot water with soap. It has a relief that has to allow air back in once the system cools. It's the cap on the coolant reservoir. If you think about it, that collapse means your head gaskets are in pretty good shape.

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Last edited by ramonday; 08-30-2010 at 07:55 AM.
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post #6 of 12 (permalink) Old 08-30-2010, 10:15 AM
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Probably the water pump-- look at the weep hole - close to the lower hose.

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
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post #7 of 12 (permalink) Old 08-30-2010, 11:22 AM
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if it is leaking toward the back of the engine, on the passenger side, it could be the cooling hose to the turbo. it is a 1/4' HOSE THAT COOLS THE TURBO.
had this happen with our 05. and of course if it is at the front of the engine it would be the water pump
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post #8 of 12 (permalink) Old 08-30-2010, 11:52 AM
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Quote:
Originally Posted by jc1843 View Post
Probably the water pump-- look at the weep hole - close to the lower hose.
This

It will get worse as time goes on. No it wasn't because of your tune. Mine went out just before 100k miles and started with just a weep hole and began to leak like a sieve.. The pump itself isn't expensive but the labor kills you. Its about $550 installed at employee prices. If you do it yourself it saves the labor but is a pita.

Get under your truck and flash a light around the front of the engine. Water pump is down on the driver side I think and will leak around the pully (on mine, at least).

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post #9 of 12 (permalink) Old 08-30-2010, 12:39 PM
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Quote:
Originally Posted by Storm59 View Post
I have something not quite similar. i have a cooolant leak ever so slight. on the garage floor over night i see a puddle. at first I thought it was condensation from the AC. But then i noticed it was not evaporating like water should. it did feel a bit oily to the touch but does evaporate as the day goes by.
I did notice the DS Rad hose collapses after it is shut down for a while say about 3 hours or so.
I noticed the reservoir for coolant was slightly below the cold mark.
any tips on where i could start looking?
Quote:
Originally Posted by cherokeechief View Post
if it is leaking toward the back of the engine, on the passenger side, it could be the cooling hose to the turbo. it is a 1/4' HOSE THAT COOLS THE TURBO.
had this happen with our 05. and of course if it is at the front of the engine it would be the water pump
Thanks I will look for that leak point. I am way overdue for a coolant flush do i will have it checked then

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post #10 of 12 (permalink) Old 10-12-2014, 07:38 AM
 
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I have a 2005 GMC with duramax and it is blowing coolant down passenger side of truck and is not running hot . we ran a pressure check for 4 hours and did not leak down at 20psi could this be a head gasket problem and how much to fix ? thanks
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