Is this the heater to tank hose?

[DavidZ71]

Noticed some coolant loss in my reservoir. No other symptoms of cracked head, etc. Took a look around and looks like one of my heater hoses is deteriorating and definite leakage around the connection. The spring clamp was so frail that it broke in half when I poked it lightly.

Is the hose in the picture (going from the reservoir to the thermostat/water pump ACDelco 18221L? Just want to make sure before I order the part. It's for a 2004 Z71. Looks like the large diameter hose and small heater hose come as a unit with a fitted y-joint to the water pump area.

https://imgur.com/a/lIDt03y

 

[Joseph Garcia]

Post the last 8 digits if your truck's VIN, and @915_Tahoe will be able to give you the correct part number.

 

[DavidZ71]

Last 8 are: 4R257745

 

[OR VietVet]

More Information for GM GENUINE 19332791

More Information for ACDELCO 16612M

Looks like two choices: First says from expansion tank

Second says from radiator to tank.

 

[DavidZ71]

I don't think either of those are correct. The hose I'm looking for has a unique y-connection with one of the heater hoses where it meets the water pump. You can see it in the second pic I posted. The part number I listed looks exactly like what I need, I just wanted to be sure

 

[OR VietVet]

I see no second pic. Never mind, I see where you can click for the second pic. I see it. This one then:

More Information for GM GENUINE 15792821

Or this one: https://www.rockauto.com/en/moreinfo.php?pk=506435&cc=1424247&pt=6892&jsn=934

 

[DavidZ71]

Perfect! The ACDelco one you listed is what I thought it was. Ordered and on its way. Thanks!

 

[OR VietVet]

No problem. Glad I could help. That is the same one I recently replaced when I did the complete hose changeover. Once I saw the second pic and looked under my hood to compare pics, I knew I could find it.

 

[915_Tahoe]

Last 8 are: 4R257745

Not at the office today till monday

 

[915_Tahoe]

Last 8 are: 4R257745

Straight heater hose
Gm#15145587

Y heater hose
Gm#15792822