Cabin Heater Hose Size

[nobby]

Fighting a persistant weep on my heater hose. Can someone confirm that the front cabin heater pipes are 5/8" and 3/4"? The Tee at the top is 3/4 and so the black hose that goes to the smaller pipe is a reduction hose. Anyone got a part number for that I really dont want to screw around with reduction fittings and clamping a 3/4" hose onto smaller pipe aint gonna cut it. Best I can come up with so far is this:

https://www.napaonline.com/en/p/NBH10083

Cheers
Nobby

 

[jrsavoie]

I don't remember which are which. I made new tees with a brass T, 5/8 pex barbs and 3/4" hose barbs

 

[Husker6.5]

I used a Pex ½x½x⅝" brass Tee from Home Depot, which provided a nice, snug fit for the two ⅝" heater hoses and the ¾" hose from the crossover (still used hose clamps). Then to replicate the flow regulator to the front heater core that's in the OEM plastic Tee, I took a ½" copper pipe cap, drilled a 5/16" hole on it, slightly flared the open end of the cap with the pein end of my 12oz ball pein hammer, then sweat soldered it closed end first into the ½" Pex nipple for the front heater core. Worked like a charm!

 

[jrsavoie]

I used a Pex ½x½x⅝" brass Tee from Home Depot, which provided a nice, snug fit for the two ⅝" heater hoses and the ¾" hose from the crossover (still used hose clamps). Then to replicate the flow regulator to the front heater core that's in the OEM plastic Tee, I took a ½" copper pipe cap, drilled a 5/16" hole on it, slightly flared the open end of the cap with the pein end of my 12oz ball pein hammer, then sweat soldered it closed end first into the ½" Pex nipple for the front heater core. Worked like a charm!

That needs to be posted someplace important

 

[nobby]

Yeah my OEM tee's are still in good shape, I just need to replace the front core hoses. OEM are discontinued, the part guy gave me a full print out of the whole system and part numbers I'll post that here at some point. I have come up with the following Gates numbers:
18076 - 5/8" x 3/4" with a molded 90 DEG
28476 - 3/4" x 3/4" with a molded 90 DEG
I'll post if they work or not.

Cheers
Nobby

 

[Husker6.5]

When I replaced the front heater core to the new homemade tee (because the plastic OEM one had cracked and leaked) I just used standard 5/8" heater hose off the roll I had sitting in the garage. The natural curve of the hose off the roll made for a perfect fit between the heater core nipple and the new Tee. I had some left over hose heat shield I slid over it to protect it from any heat radiated off of the turbo/exhaust pipes. Cost me only a few cents for the piece of hose instead of the almost $20 the molded piece of hose with the bend in it.

 

[Husker6.5]

That needs to be posted someplace important

I had posted the same info a few years back in a thread about where to find the no longer available OEM plastic heater Tee for Suburbans. A couple of us mentioned using a Pex Tee. I just went as far as to also replicate the OEM flow restrictor so that the rear heater core got sufficient flow of hot water to it.