Thought my rad cap was leaking again, as I walked towards Gregg he had a bit of a puddle under the front. It is coolant. Looked all around the filler cap and nothing. Let him heat up. NOTHING. Went for a drive to the gym, left gym, nothingggggg. Ugh. Finally when I pulled into my driveway he started leaking. A pinhole leak in the seam on the plastic filler neck that the cap screws onto.. Part number 10344426. Had to take the air box off for a clear view. odd as to why it would spring a leak there but it is a 13 year old piece of plastic that's gone through hundreds of hot cold cycles. A 20 dollar fix. Gonna replace hoses at same time. What hose do I need to buy to make the small section between the head and filler neck? 1.31 inside diameter correct? I remember reading about it years ago and can't find the thread. Otherwise, greggs been doing great!

 

I am sure there is a part number in all of the relevant parts books.

 

All Engines
Auto trans GM P/N 15241778
Man trans GM P/N 15241782

Don't know how transmission matters, but that's what the book says. You might just take your new filler neck down to the store and get something that fits, might save some bux.

 

I just bought a pair of the longer hoses for 10 bucks each and cut to size. I also brought the filler neck forward a hair for ease of access in the future. The upper hose was soft and bloated and needed replacing. That little guy on the head side was worse off. Everything is all better now! Whenever I get to replacing the thermostat I'll do the lower hose too.