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Old 12-01-2021, 08:55 AM   #1
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Coolant Hoses

2001 Intrigue, 8.9 ISL

I'm doing some preventative maintenance and plan on replacing a bunch of coolant hoses. I'm assuming they will not be available from Cummins since they are on the coach side going from the engine block to the radiator. Does anyone have a source for hoses? Thanks in advance
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Old 12-03-2021, 09:06 AM   #2
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My 2004 ISL has 2 1/4" upper and lower coolant hoses to the radiator. The connections to the radiator are short hoses connecting to the longer formed steel tubing that curves around the frame. These are the short hoses https://www.amazon.com/dp/B00CB23R4G...2s9dHJ1ZQ&th=1 and use good clamps https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1 FYI - Upper hose connection on the radiator is hard to access. Had to remove my muffler to get to it.

The hoses connecting back to the block are NAPA 7496 (2 1/4" formed 90 deg) which will need to be trimmed to the proper length. I also replaced the gasket under the lower hose fitting on the block which is a Cummins #5398279.

I had an issue with the hydraulic hose wearing through the lower pipe which is on this post https://www.irv2.com/forums/f112/coo...ml#post5796754 I'd look the heater/hydro hot/hydraulic hoses over to make sure nothing is rubbing holes in hoses! Hope this helps.
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Old 12-03-2021, 11:39 AM   #3
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Thank you! Really appreciate the links to the parts as well. I will be replacing these when I do the coolant change shortly.
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Old 12-03-2021, 12:33 PM   #4
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When I replaced my formed hoses I went to Napa and picked out hoses that were for some other vehicle but were the correct diameter but had the correct bends in the hose . When I got home I cut out the part of the hose I needed using the old hose for my template.
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Old 12-17-2021, 02:05 PM   #5
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I have replaced all my radiator hoses with silicone hoses and the proper lined clamps on my 1999 Allure. This site has full selection of straight and formed. Silicone wont deteriorate, better temperature resistance and stays flexible for easy disassembly if required.

https://www.pegasusautoracing.com/ad...D=SILICONEHOSE
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Old 12-17-2021, 05:50 PM   #6
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When we did the 04 Allure with ISL hoses preventatively, we did a mix of Cummins and Gates (Based upon availability...). Actually, we got the gates from NAPA...

And while this is a coolant related thread, I'll repeat for new owners of 2004 and earlier coaches, that the fuel hoses feeding generators, heaters like Hurricane and Hydro Hot. (And typically on CC's, the fuel lines to the engine itself, are metal tubing.)... These were designed to work with Diesel Type II, NOT the Ultra Low Sulphur Diesel (ULSD) fuels.

They impacted these 1/4" fuel lines from the inside, resulting in mini pin holes, and leaking diesel. Some fires in RV's and also the Boating community, still occur to this day...

Used to post this info more frequently, and recommend that if an owner of a new coach can not validate by an actual part number from the existing hose, that it is Post ULSD designed. (Took about 1 to 1 1/2 years to figure out what was going on, and for the hose manufactures to remedy, and possibly the ULSD recipe was altered too.) - that these hoses be added to our preventative maintenance To Do list.

I was disappointed that their was not a recall, or mass communication, that these Type II designed fuel lines were at risk... Fires are a serious thing! (And of course, I felt the same way about the mickey mouse Norcold 1200 'fixes' too - lives are lost!! Rant off!)

I used, and feel it is great quality, Gates Barricade Fuel lines...

Best to all,
Smitty
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