Fighting coolant issues - 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 #1 of 24 (permalink) Old 11-23-2018, 10:54 AM Thread Starter
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Fighting coolant issues

Hello everyone, new to the forum. I’ve had my truck for about 9 months. I’ve had no issues with it up until about a month ago. My low coolant light came on so I filled the reservoir up and burped the system. Ever since then I’ve been fighting the coolant. Sometimes my truck goes a few days of driving without “loosing” coolant. Other times it’s one drive. I’m at a loss. It’s not puddling up underneath my truck when it sits. The coolant doesn’t appear to be going into my oil or my oil into my coolant. When I start my truck after it’s cooled off, the temp comes up to about 145 then drops to like 80-90 then 5-10 minutes later it comes up to 190-200 then bounces from 180-195 as it should. I’ve just continued to try and burp it because I read that sometimes they can be a real PITA to burp. I’m really hoping it’s not HG’s. I’m getting a coolant cap today to see if that helps and I also read of a guy who had similar issues to mine whom discovered his rad had a small crack so tomorrow I will be taking it to my shop and putting a burp funnel on it and letting her run for a good while with the heat on to make sure I’ve got all the air out. Should I do a pressure test on it after I burp it? 15 psi for 30 minutes or should I do that before? I’m new to diesels but not mechanically illiterate so I’d like to know all the things I can do to help diagnose it. Thanks for all the help y’all can give me.


P.s. 06 lbz GMC Sierra 2500hd AWD. EGR block off plates, K&N CIA, 3” dp to 4” mbrp, edge insight CTS2. Just turned 120k, bought it with 110 this past February.

‘06 LBZ Sierra 2500HD AWD. K&N CAI, EGR Block plates, 3” DP to 4” MBRP, transgo jr, edge insight CTS2. Full AMSOIL fluids.
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post #2 of 24 (permalink) Old 11-23-2018, 02:34 PM Thread Starter
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Bump for some insight. Got a new coolant cap from Autozone. Gonna make a pressure testing cap out of the old one.

‘06 LBZ Sierra 2500HD AWD. K&N CAI, EGR Block plates, 3” DP to 4” MBRP, transgo jr, edge insight CTS2. Full AMSOIL fluids.
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post #3 of 24 (permalink) Old 11-23-2018, 02:36 PM
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Have you checked the weep hole underneath the water pump or any signs of your lower radiator hose being wet?

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post #4 of 24 (permalink) Old 11-23-2018, 02:39 PM Thread Starter
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I read about the weep hole but haven’t checked it yet. Nothing appears to be wet or leaking but I’ve yet to confirm the water pump

‘06 LBZ Sierra 2500HD AWD. K&N CAI, EGR Block plates, 3” DP to 4” MBRP, transgo jr, edge insight CTS2. Full AMSOIL fluids.
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post #5 of 24 (permalink) Old 11-23-2018, 02:42 PM
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My 04 never left a puddle but it was definitely noticeable after looking underneath.. wouldn't hurt to take a look

2017 L5P
DDP intake
DDP intercooler pipe
Cognito UCA's
Cognito PISK
lift keys
Fox Shocks
18x9 +18 Method wheels
295/70/18 Nitto terra G2's
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post #6 of 24 (permalink) Old 11-23-2018, 02:45 PM Thread Starter
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Thank you, I will do that and report back with my findings.

‘06 LBZ Sierra 2500HD AWD. K&N CAI, EGR Block plates, 3” DP to 4” MBRP, transgo jr, edge insight CTS2. Full AMSOIL fluids.
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post #7 of 24 (permalink) Old 11-23-2018, 05:08 PM
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post #8 of 24 (permalink) Old 11-23-2018, 06:28 PM
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Replaced the water pump pretty much immediately after I bought my lly with about 130k on it.

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post #9 of 24 (permalink) Old 11-24-2018, 09:32 AM Thread Starter
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I drove my truck briefly yesterday morning and parked it. When I checked the upper rad hose it was not hard. I’m searching for the weep hole in the water pump but I can’t see anything that looks like a weep hole. Even looked at multiple videos and I don’t see it. Put the new cap on before I drove it and topped it off with coolant but it’s low again. Below half a tank. Any advice on finding this “weep” hole. I read that once the trucks up to temp it more than likely won’t leak

‘06 LBZ Sierra 2500HD AWD. K&N CAI, EGR Block plates, 3” DP to 4” MBRP, transgo jr, edge insight CTS2. Full AMSOIL fluids.
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post #10 of 24 (permalink) Old 11-24-2018, 10:05 AM
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