What is this leak? - Chevy and GMC Duramax Diesel Forum
06-07.5 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 Ect

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Old 11-13-2012, 02:16 PM   eBay Motors  #1 (permalink)
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What is this leak?

The truck is a 06 Sierra. It has a coolant leak but it only leaks after it has been sitting for 3-5 hours. It does not leak while running. Seems kinda odd to me.

It appears it is leaking from the bolt in the first picture. I can not see anything above it leaking that is running down. The bolt is tight but what is this called that the coolant is leaking from?

It looks like it may be part of the oil filter housing, I know the oil filter housing connects to the oil cooler and the coolant flows down through the cooler while the engine coolant absorbs heat from the oil. The oil goes through the oil return line, to the oil filter, then to the main engine oil passage, but does any coolant run through the oil filter housing?



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2003 LB7 2500HD ECSB

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-285/75R16 Michelin LTX A/T 2s
-340k miles and counting
-Daily Driver
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Old 11-13-2012, 03:06 PM   eBay Motors  #2 (permalink)
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bump, anyone?
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2003 LB7 2500HD ECSB

-Edge Evolution CTS
-MBRP 4" w/ 5"tip
-Banks Ram Air
-35w AGT 6000k HID's
-5% tint allaround
-285/75R16 Michelin LTX A/T 2s
-340k miles and counting
-Daily Driver
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Old 11-13-2012, 03:16 PM   eBay Motors  #3 (permalink)
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Could be the lines feeding coolant to the egr cooler are leaking at the connection or are dry rotted. Check to see if there is any coolant pooling in the engine valley, it could be running down the back of the engine to where you see it...
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Old 11-13-2012, 08:36 PM   eBay Motors  #4 (permalink)
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Cool, I will look at that tomorrow.
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2003 LB7 2500HD ECSB

-Edge Evolution CTS
-MBRP 4" w/ 5"tip
-Banks Ram Air
-35w AGT 6000k HID's
-5% tint allaround
-285/75R16 Michelin LTX A/T 2s
-340k miles and counting
-Daily Driver
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