Upper coolant pipe install L5P - Chevy and GMC Duramax Diesel Forum
2017-19 GM T-K2 Platform Performance Parts Discussion Discussion of Performance Parts For the '17 and up L5P Duramax Trucks No Advertising

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post #1 of 6 (permalink) Old 08-10-2019, 09:26 PM Thread Starter
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Upper coolant pipe install L5P

I currently have the WCFab intake pipe installed in my L5P and am planning to install the intercooler pipe and upper coolant pipe soon to complete the look. Question is: Do I need to drain the coolant before removing the coolant pipe? This is probably a stupid question but I'm not sure how much coolant is sitting inside that pipe when the truck is off. I don't want to spill coolant all over the garage floor when I do the install.

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post #2 of 6 (permalink) Old 08-11-2019, 05:57 AM
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How do you like the intake pipe? Aside from looks, did it help with throttle response? It's just a little laggy off the line, especially at slow speeds, like rolling through a stop sign and then trying to punch it.

Sorry for the derail. No real help on the question
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Last edited by Noble_dmax; 08-11-2019 at 11:05 AM.
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post #3 of 6 (permalink) Old 08-11-2019, 10:25 AM
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Yes, youíll make a mess if you donít drain some, the upper coolant hose is full of coolant.


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post #4 of 6 (permalink) Old 08-11-2019, 06:25 PM Thread Starter
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Quote:
Originally Posted by Noble_dmax View Post
How do you like the intake pipe? Aside from looks, did it help with throttle response? It's just a little laggy off the line, especially at slow speeds, like rolling through a stop sign and then trying to punch it.
I like it. I debated for a long time before deciding on an intake kit, but ultimately decided to go with this so that I can do the complete WCFab pipe set. It would be hard to claim any improvement in throttle response without a tune, but I did notice a difference in sound. The truck sounds more like a diesel at idle and I can hear a little bit more turbo whistle under acceleration. Mostly... it is for looks though.

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Originally Posted by M.A.M. View Post
Yes, youíll make a mess if you donít drain some, the upper coolant hose is full of coolant.
Thanks.

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post #5 of 6 (permalink) Old 08-11-2019, 06:26 PM
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Thanks for the honest reply!

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Traded:05 lly ccsb 205k miles, built trans and supporting mods

Traded:09 LMM CCLB Bone stock, fully loaded. 86xxx miles.
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post #6 of 6 (permalink) Old 08-31-2019, 09:06 PM Thread Starter
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I have the coolant pipe on order as well as the intercooler pipe. I did not order the turbo intake horn yet because I have not decided if I want to do the PCV reroute or not.

Since I installed the intake pipe I have noticed an increase in MPG. This might just be a coincidence as I also just crossed over 3k miles. Perhaps the truck is just breaking in. Whatever the reason, I am very happy with how the truck is driving right now. I went on a drive today on back roads (45-55 MPH) and got around 22 MPG. I can get similar MPG on the highway at 70 MPH with cruise control on. Around town is still about 15 MPG.
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