Fighting coolant issues - Page 2 - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & 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 #11 of 24 (permalink) Old 11-24-2018, 10:17 AM
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There are several areas up top that can leak while underway, roll off and hit the ground, not leaving a puddle. You might need to do a pressure test to find it, but the WP is the 1st and easiest to check.

On the WP weep,
Follow your lower hose up to the pump. The weep hole is behind that neck, between the hose and the block.
You're looking for any moisture/residue in that area...like this;
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File Type: jpg waterPumpLeak.jpg (54.3 KB, 80 views)

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
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post #12 of 24 (permalink) Old 11-24-2018, 11:25 AM
 
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I had this problem with my 03 Silverado. Was losing 1/2 gallon of cooling a week. If your truck has Castech Heads there is a known problem with developing small cracks at the internal (under the valve cover) Head bolts. It forces the coolant into the valve cover where the coolant water evaporates out and the glycol goes into your oil which mixes and you cant tell when you change the oil. Someone posted that they had fixed their problem with Bars Leak Head gasket sealer. I tried it and it worked like a charm. My truck had 175,000 on it and I never lost any more coolant and sold it at 230,000 miles.
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post #13 of 24 (permalink) Old 11-24-2018, 11:50 AM
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OP's '06 LBZ, different.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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post #14 of 24 (permalink) Old 11-24-2018, 02:20 PM Thread Starter
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I donít see anything leaking or dripping around the water pump. I put the burp funnel on and ran it for about 30-45 minutes. Warmed up to about 160 then dropped to 85 slowly. I reved the truck to 3k for about 15 seconds and let idle for about a minute before doing that again. Then the temp came up to 210 and leveled out at 180. It sucked the entire burp funnel dry so I filled the funnel up about a quarter of the way and left it idle for another 10 minutes occasionally Reving to 3k for a few seconds. Turned the heat on high and left idle for about 15 minutes until no bubbles came up through the funnel. Shut the truck off and plugged the funnel and removed it and put the cap on. Letting it cool down now to see what happens. No smoke out of the exhaust when reving, oil isnít milky and coolant doesnít appear to have any oil in it either. The weird thing to me was the coolant pushed back into the funnel filling it before overflowing it for a few minutes up until the tstats opened, thatís when it sucked it dry. Iíve never experienced this before, is it a duramax thing? Is it normal?

Ď06 LBZ Sierra 2500HD AWD. K&N CAI, EGR Block plates, 3Ē DP to 4Ē MBRP, transgo jr, edge insight CTS2. Full AMSOIL fluids.
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post #15 of 24 (permalink) Old 11-25-2018, 05:08 AM Thread Starter
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After burping the system, it idled right around 185 for several minutes. With full coolant. I plugged the burp funnel and removed it and put the cap on. Left it sit for about an hour, started it back up and warmed it up to 180. Reved it up to hit 190 and make the stats open, coolant dropped about 25-40% and didnít come back up. Removed the cap slowly and topped it off with coolant. Put the cap on and reved it up to make the stats open. It dropped but came back up after the stats opened and closed. Did it 2 more times, got the same effect. Drove home to get my gear around to head to work. Sat for maybe an hour, went out and started towards the northeastern part of my state, 25 miles into my trip the coolant temp dropped to 130 hungout for a minute and bounced back to 185 and the low coolant light was displayed yet again.... t stats were replaced no more than a month ago with Autozone duralast 180-185

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post #16 of 24 (permalink) Old 11-25-2018, 06:06 AM Thread Starter
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Sorry just read everyoneís post on this page... didnít realize there was a second page Lolol my bad

Ď06 LBZ Sierra 2500HD AWD. K&N CAI, EGR Block plates, 3Ē DP to 4Ē MBRP, transgo jr, edge insight CTS2. Full AMSOIL fluids.
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post #17 of 24 (permalink) Old 11-25-2018, 08:53 AM
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Let's find out where the coolant is exiting the system.
Wrap a rag around the overflow tube end on the surge tank. Let's see if it's coming out there or not.

You've mentioned about no oil in the exhaust, no coolant in the oil, no oil in the coolant....those are all tell-tale signs of a HG problem...with a gas engine.
With the head design on the Dmax, a HG failure doesn't follow any of that logic.

It fails at the cylinder fire ring and slowly pressurizes the coolant system, forcing coolant out the overflow tube.
This also shows as an erratic reading on the temp gauge; staying low (when it should be rising) with no heat inside, then rising quick to operating temp (heater inside kicks in on full hot)...following by a 'low coolant' warning along with a plummet in ECT.

When you pull over and check, you'll find the upper hose soft and the surge tank level empty.

Stock ECT gauge; it's not accurate, it reads higher than actual.
In your last post, you mentioned 180-190, 160 and 130....if you did reach normal operating temp with stock 180/185 t-stats, the gauge reading should've been 200+.

You mentioned new VatoZone T-stats a month back, why?
Was there a problem of too cool?
Or were you chasing the wild temp fluctuations and coolant loss?
Or did this start after the new T-stats?

Air in the system from a reoccurring leak can cause the weird ECT swings.
If you could reach OP temp and not have the 'low coolant' come up, shut the truck off and park it overnight, checking the upper hose the next morning after overnight cool down, you'd see a firm hose there (like a tennis ball) if it was a HG problem.

However, at the rate you're losing coolant, that tell-tale test might not work.

Let's start with that overflow tube, see if that's the exit point for the coolant, and work from there.
Did you adapt the tank cap yet, for the 15psi pressure test?

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

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post #18 of 24 (permalink) Old 11-25-2018, 09:07 AM Thread Starter
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Okay, I can do that after Iím off and report my findings. Iím starting to think itís a hg problem especially after what you said above. I made a pressure test cap but didnít use it since I thought I had it figured out. I have an edge insight CTS2 that Iím getting my ECT readings off of so Iíve noticed that the stock gauge reads higher already. Like I said in my original post, Iím new to diesels and I know theyíre similar in some aspects but very different in others. Thatís why I came here. I know itís definitely pushing back to the surge tank since when I was trying to burp the system, it would pull the coolant in when I reved it up, then when I released the throttle it would push it out like there was excess in the system...

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post #19 of 24 (permalink) Old 11-25-2018, 09:12 AM
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With the block plate mod, did you also bypass the EGR cooler, or leave it as is?

Rare, but a leaking cooler can cause a pressure problem as a boost leak blowing past the EGR valve. Bypass hose would rule that out.


As time has passed, we've seen that GM continued to use the flawed LLY HG design in the early production '06 LBZ engines.
While the LBZ didn't have all of the other contributing problems as the LLY did (flawed inlet duct, smaller rad, different turbo, etc), even with the old design HGs, failure on them is not as likely as they were on the LLY engines.
Rare, but it happens.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"

Last edited by Hook'em_Horns!; 11-25-2018 at 09:16 AM.
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post #20 of 24 (permalink) Old 11-29-2018, 04:20 PM
 
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When you finish, check to see if your truck uses these coolant tabs. The GM part number is: 3634621. I know that many GM’s used these. Most people do not know they exist. I have seen many head gaskets changed that only need these tabs. My 6.5 would not hold water until I put these in. The heads were fine.
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