OK, here's what I'm planning to do: replace hoses #12, #15 and #20; carefully remove the clamps (#16's) and replace with regular hose clamps and reuse the reducer (#13).

Part numbers needed to buy:

#12 = 10188037
#15 = 10146991 (is this only the sleeve or the hose/sleeve together?)
#20 = what's the PN?

When I called the dealership last Friday they said they didn't sell these hoses separately, and that no one did so I'd have to buy the entire assembly. If the GM dealership won't sell me these separately, where can I get them from? NEVER MIND, I just called Jason.

http://shbox.com/1/heater_hoses.jpg

 

Go to your favorite autoparts store with a piece of the old hose and they will cut some to whatever length you need.

 

I'm going to try to do as much with regular hose as possible, but some/most of these have formed bends and with regular hose it would kink.

 

Then try to take the whole hose. They do have some hoses with bends in them, so they will try to match it up.

 

That's my plan

 

How do you plan on getting the crimp off of the F#20 hose without damaging the pipe underneath?

 

Dunno, and that goes for all 4 of those connections, I'll cross that bridge this coming weekend when I get to it (I'm favoring the hack saw blade, I've taken off many fittings with just the blade and been successful). Worse comes to worse, I may just pony up the dough and buy the entire assembly from Jason...it'll be about $100 for basically everything (connections already made). The hose pieces themselves ordered from him are almost as expensive as the entire assembly (I'd save about $20). That's why I'm going to take everything off and see what I can find at NAPA and the local GM supply parts store first, then make my decision.

Would cutting completely through the pipe be totally unheard of? (just cutting off the connector altogether) I'm sure the end of the metal pipe has a lip of some sort and their may not be enough room afterwards to slide the new hose and clamp down on....just a thought.

 

Why not "pony up" and get a dremmel tool with a saw blade---then you will have a tool that you can use for other things down the road. Just a though.

 

Actually I removed the aluminum crimp on factory clamps with nothing more then a good pair of channel locks and a flat head screw driver used to pry it back a little. It worked great and the crimp fitting folded and peeled away like butter, and a full on Dremel would almost make it too easy lol.

FWIW, I have all 5/8" or 3/4" heater hose in place of most of my heater core and oil filter heater lines, reusing the factory metal tubes and it works great for me.

 

I did exactly what he did, replacing all the hoses with stock from Autozone. They do have correctly angled hose for the few areas on the LT1 where you have to have a special bends or turns, but most of the hoses on my LT1 are stock hoses cut to fit and zip tied in place. Slow, tedious work, but I think it cost me about $25.00 complete! Heck, the hardest part was bleeding the system after refilling the radiator / engine with coolant! Do yourself a favor, though - flush the system before you take off the old hoses, then responsibly dispose of your old coolant. Might not hurt to change your heater core to a new one - you won't believe the crud that can build up in the old core. Believe it or not, it's about an extra hour's worth of work when you're changing the hoses anyway. And it's the easiest heater core swap I have ever seen! Good luck, just use your time and elbow grease! If you do it my way, you'll spend about a hundred bucks, but you could be saving a radiator change later on!