Duramax Diesels Forum Truck of the Week
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Old 06-25-2019, 05:50 AM
N2BRK N2BRK is offline
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Default Silicone heater hoses

I'm wondering how much success or lack thereof folks have had with these. When it was time to do mine, I bought silicone instead of GM and I have had nothing but leak after leak. I have tightened and re-tightened many times. Some days or weeks or even months I'm ok and then a season will change or something and it's like Valdez under my truck. Last winter I had a small leak that I couldn't stop, so I was relieving pressure when I'd get home each time. Then it stopped when the weather got warmer. This morning there's a flood under the truck from another spot. Is this dumb luck or were these a bad idea?

TIA for feedback.

Wally
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Old 06-25-2019, 05:55 AM
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What hoses are you referring to? Are you positive its coming from the hoses? If so, might be a good idea to replace them. I'm going to assume you're talking about the large diameter radiator plumbing. My ACDelco is going strong after 3 seasons of beating it and was cheap.
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Old 06-25-2019, 06:07 AM
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these:
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File Type: jpg coolant_hose_kit_06-10_lbz-lmm_black.jpg (34.1 KB, 43 views)
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Old 06-25-2019, 07:15 AM
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Quote:
Originally Posted by N2BRK View Post
these:
Have you confirmed its the hoses leaking? Have you contacted PPE about it?
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Current Rides:
1) Toy: 2005 LLY ECSB, Leather, Sunroof
-1340hp/2200ft-lbs @ ATS Diesel (06/04/19)
-Tuned by Zach @ Starlite
-Built Motor, Forced Inductions Billet ETR Gen 4 S480/96/1.10 T6 w/V2 Race Cover, Modded Exergy 250% Injectors, Exergy 14mm Street Pump/LBZ CP3, Goerend Q Converter, Billet Trans, Fuelab Supply Pump/Reg, RCD & Beans Sumps, Front E-Locker, TrueTrac, Yukon 4340 Rear Shafts, Traction Bars, DHD Center Link Brace, DHD Lower Crossmember Support, Banks iDash 1.8 Monitoring System

2) DD/Tow Rig: 2002 LB7 CCSB, Leather, Loaded
-Tuned by Starlite
-Cast S475/96/1.10 T6 Over Stock IHI, FASS 150,4" Exhaust, RCD Sump, PPE Sleeves, DHD Centerlink Brace, DHD Lower Crossmember Support, Steering Wheel Radio Control Swap, LML Oil Pump, LML Piston Cooling Nozzles, 2020 L5P Oil Cooler, Derale Aux Oil Cooler w/Fan, Banks iDash 1.8 Monitoring System
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Old 06-25-2019, 07:22 AM
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I have and yes I did last year.
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Old 06-25-2019, 07:56 AM
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Silicone hoses are generally not recommended for street / DD applications. Most people seem to have your problems with them, where the clamps need tightened constantly or they leak. I have read that silicone hoses are actually somewhat permeable by water, so you slowly lose water from your system (not like a puddle, tiny bits come through and flash off). That means your coolant mixture gradually becomes more and more glycol unless you top off with only water.

I run a set of silicone hoses on one of my dirt bikes (they are colored to fit the theme of the bike), and they have worked well, but I probably put 500 miles/year on that bike, and I check the clamps frequently. I have avoided them on my cars/trucks because of the high maintenance.

Yours sound worse than "normal" for silicone hoses, but if you are looking to have a more maintenance free truck, you will want to look into spring clamps (like stock, but I'd get more tension) instead of the T-bolt clamps. The T-bolt clamps don't compensate for thermal expansion in changing weather like a spring clamp does. Or do like me, and stick with plain rubber hoses. Not as sexy, but they just work.
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Old 06-25-2019, 08:18 AM
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Well shit, i have the same kit, but I haven't put them on yet. Hopefully I dont have the same issues as you are having.
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Old 06-25-2019, 08:19 AM
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You donít drive your truck, Russ...


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Old 06-25-2019, 08:20 AM
N2BRK N2BRK is offline
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That's a really fair answer. I jumped on these because I thought that they were an improvement over stock, and I was in need of replacing mine. It looks like I made a mistake and these aren't for me. I hate doing a job (and paying for parts) twice!! Thanks
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Old 06-25-2019, 08:21 AM
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Quote:
Originally Posted by 1TRIKHD View Post
Well shit, i have the same kit, but I haven't put them on yet. Hopefully I dont have the same issues as you are having.
Good luck.
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Old 06-25-2019, 08:33 AM
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Quote:
Originally Posted by N2BRK View Post
Good luck.
What did PPE have to say about the issue you are having?

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2006 CCLB LT3 Victory Red

SDP Built Trans w/ Goerend Y billet stator
S472sx-e .87/1.0ar w/ SDP Piping
Wagler street intake
Calvert Racing bars
ADII 165
Full Kryptonite Front end
PPE manifolds up pipes
Special Thanks to:Scott@SDP
Tuned by:Blake
Best time to date: 11.96 @ 112.50mph
Best 60ft: 1.66
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Old 06-25-2019, 08:36 AM
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asked me if the clamps were maxed out yet and if not, keep tightening. I have them so tight that it scares me to go more... yes there's some left on them - but I'm worried about deformation they are already so tight.
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Old 06-25-2019, 09:13 AM
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Quote:
Originally Posted by M.A.M. View Post
You donít drive your truck, Russ...


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Matt I know only during the summer months.
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2006 CCLB LT3 Victory Red

SDP Built Trans w/ Goerend Y billet stator
S472sx-e .87/1.0ar w/ SDP Piping
Wagler street intake
Calvert Racing bars
ADII 165
Full Kryptonite Front end
PPE manifolds up pipes
Special Thanks to:Scott@SDP
Tuned by:Blake
Best time to date: 11.96 @ 112.50mph
Best 60ft: 1.66
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Old 06-25-2019, 09:14 AM
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Quote:
Originally Posted by N2BRK View Post
asked me if the clamps were maxed out yet and if not, keep tightening. I have them so tight that it scares me to go more... yes there's some left on them - but I'm worried about deformation they are already so tight.
You wouldnt think you would have to max out the clamps to keep it from leaking. Jesus!
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2006 CCLB LT3 Victory Red

SDP Built Trans w/ Goerend Y billet stator
S472sx-e .87/1.0ar w/ SDP Piping
Wagler street intake
Calvert Racing bars
ADII 165
Full Kryptonite Front end
PPE manifolds up pipes
Special Thanks to:Scott@SDP
Tuned by:Blake
Best time to date: 11.96 @ 112.50mph
Best 60ft: 1.66
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  #15  
Old 06-25-2019, 10:40 AM
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I run silicone hoses on my heater core lines(not PPE's or MISHIMOTOS, bulk hose I got locally). GM used silicone from the factory on the heater hoses on 6.5 SUB's because of how close they ran to the engine. I used the stock spring clamps and have never noticed and coolant drips or leaks, but I do ALWAYS have a coolant smell around them, and I do lose a little bit of coolant every oil change.
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