Originally Posted by jaki30

Many thanks. While I was concerned with keeping the originality, I was afraid the reliability wasn't there due to the age of the parts. Would just be my luck for a hose to fail while on a cruise somewhere.
Whomever made that list deserves a huge thank you!

Originally Posted by mister2

If I were a poor student or a struggling artist, I'd wait till fails.

BUT

If not, I'd replace everything with OEM and keep the old parts. That way, if originality was ever in question, I'd show them the parts that came off the showroom floor. Maybe even re-install them since they were good when I took them off.

Originality AND reliability!!

Originally Posted by mister2

I thought the set the tone....

Originally Posted by Ceedub53

I'd start replacing them, asap.

Here is the part numbers of every radiator/water hose for the C5. I can't claim credit for it as it was posted here a week or so ago by someone else. I saved it, here it is. Btw, much thanks to the guy who originally posted it:

Coolant hose part numbers

I just replaced all 8 coolant hoses and 2 serpentine belts. I found some part numbers were difficult to find so I thought I would share this information. I used 7 Gates hoses and 1 GM hose. Three of the Gates were not a perfect fit and I will describe what I had to do.

Gates 22405 lower radiator hose, perfect fit, I reused original spring clamps.

Gates 22404 upper radiator hose, perfect fit, I reused original spring clamps.

Gates 18125 90* elbow hose from throttle body to coolant pipe. This hose is shorter on both ends and has a smaller o.d. I replaced both spring clamps with with worm clamps. I also bought a 1/4” brass barb and did the throttle body bypass mod. The mod allowed me to push the short ended hose onto the coolant pipe far enough to get a good seal. The other end of the hose goes onto the barb. There’s a lot of debate whether this mod is worth the effort. Since I already had the shorter hose the mod was a good solution.

Gates 19816 surge tank outlet to water pump hose. The surge tank end had an extra bend about 2” long. I cut that off and it worked. I reused both original spring clamps.

Gates 18127 radiator to throttle body hose. The radiator end is no problem and I reused the original spring clamp. The throttle body end has a smaller o.d. than the original hose. I replaced that spring clamp with a worm clamp. In my case, this is the end that I connected to the 1/4” brass barb for the throttle body bypass mod.

Gates 18447 heater core pipe to water pump hose, perfect fit, I reused both original spring clamps.

Gates 28417 heater core pipe to surge tank hose. This is a 5/8” straight hose. It actually measured 9/16” I.D. There was a lot of discussions about the original hose being metric with an obsolete part number. This hose fit perfectly and I reused the original spring clamps. I bought the minimum 6’ from Rock Auto and the packing slip showed a different part number 28491. I assumed this was because there is 6’.

GM 10408463 superseded by 10229488 surge tank inlet to radiator hose. This hose makes a 180* turn. The only option from Gates was a straight hose #28409. I imagine that you could bend it enough to make it work but I did not like that option so I bought the OEM hose. This hose was by far the most expensive one. It alone cost almost as much as all the other Gates hoses.

I also bought a new Gates surge tank cap. The new ones are 18 p.s.i.
The part number is 31544.

Gates K060798 main serpentine belt.
Gates K040420 air conditioning belt.

Originally Posted by Ceedub53