Gruven heater core T-connectors

[gooffeyguy]

I replaced mine 1 1/2 ago, due to my error. I leaned on it trying to fix something else, so then I had 2 issues--stuck on the side of the road. Bought a new GM replacement.View attachment 222395 View attachment 222396 View attachment 222397 View attachment 222399 View attachment 222398

How do they disconnect from the heater core? My 2001 stopped putting out front heat this past winter and I want to flush the core. Also, what are the GM part #s for these, I should probably replace them while I have them disconnected.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[Tonyrodz]

How do they disconnect from the heater core? My 2001 stopped putting out front heat this past winter and I want to flush the core. Also, what are the GM part #s for these, I should probably replace them while I have them disconnected.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

From what I remember--yes. I leaned on it accidentally and broke it. Here's the part #.

From what I remember it was pretty reasonable.

 

[Rocket Man]

How do they disconnect from the heater core? My 2001 stopped putting out front heat this past winter and I want to flush the core. Also, what are the GM part #s for these, I should probably replace them while I have them disconnected.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

Black one 15055342
White one 15055343

 

[Tonyrodz]

Black one 15055342
White one 15055343

Aren't they the same? I only broke one, so only bought one.

 

[Rocket Man]

Aren't they the same? I only broke one, so only bought one.

No. Not the same.

 

[kbuskill]

No. Not the same.

Actually, aside from the color, they are dimensionally identical and interchangeable.

 

[Tonyrodz]

Actually, aside from the color, they are dimensionally identical and interchangeable.

I wonder why they have 2 separate parts with 2 separate part numbers then.

 

[Rocket Man]

Actually, aside from the color, they are dimensionally identical and interchangeable.

Actually, the white one tees off at a 90 degree angle while the black one angles forward in the engine compartment, I believe because that hard line that connects to it sits higher up on the firewall, where the angle of the firewall changes. It’s probably angled so that hard line maintains its distance from the firewall. Otherwise, believe me, GM would not have wasted money designing, manufacturing and stocking separate parts where one would have worked just as well.

 

[kbuskill]

Actually, the white one tees off at a 90 degree angle while the black one angles forward in the engine compartment, I believe because that hard line that connects to it sits higher up on the firewall, where the angle of the firewall changes. It’s probably angled so that hard line maintains its distance from the firewall. Otherwise, believe me, GM would not have wasted money designing, manufacturing and stocking separate parts where one would have worked just as well.

I'm not 100% certain about angles but the inlet and outlet dimensions are the same.

My understanding, from the research I have done, indicated that the difference in color was more for easy identification as to which hose went where while the vehicle was traveling down the assembly line.... but who knows... all I know is the inlet and outlet sizes are the same.

 

[Rocket Man]

I'm not 100% certain about angles but the inlet and outlet dimensions are the same.

My understanding, from the research I have done, indicated that the difference in color was more for easy identification as to which hose went where while the vehicle was traveling down the assembly line.... but who knows... all I know is the inlet and outlet sizes are the same.

No need to take my word for it, here you go. The color difference is most likely because the 2 are so similar. Different for a reason though.

 

[thompsoj22]

I replaced mine 1 1/2 ago, due to my error. I leaned on it trying to fix something else, so then I had 2 issues--stuck on the side of the road. Bought a new GM replacement.View attachment 222395 View attachment 222396 View attachment 222397 View attachment 222399 View attachment 222398

Yikes! That is the scenario im talking about, the fact that you were able to get that done on the side of the road is crazy. add to it the coolant mess and heat! To all those reading these post's i strongly advise doing this PITA "simple" job in your driveway!

 

[thompsoj22]

The damn offender.View attachment 222400 View attachment 222401

Also to those viewing these great pic's, In an emergency side of the road situation you can cut the hose just aft of the white T connector. Completely remove the hose from the water pump that connects to the black T connector and install the cut end of the white fitting hose to the waterpump and create a loop circuit and down the road you go!

 

[thompsoj22]

The damn offender.View attachment 222400 View attachment 222401

I just noticed the green coolant, Is that the correct fluid for your year vehicle? Im not being critical, just wondering?

 

[Tonyrodz]

I just noticed the green coolant, Is that the correct fluid for your year vehicle? Im not being critical, just wondering?

It's universal coolant. Should be straight Dexcool.

 

[Rocket Man]

It's universal coolant.

Holy shit is that stuff good for global warming too then since it’s good enough to cool the UNIVERSE???

 

[Tonyrodz]

Holy shit is that stuff good for global warming too then since it’s good enough to cool the UNIVERSE???

Sho 'nuff.

 

[HiHoeSilver]

Holy shit is that stuff good for global warming too then since it’s good enough to cool the UNIVERSE???

 

[Larryjb]

No need to take my word for it, here you go. The color difference is most likely because the 2 are so similar. Different for a reason though.

View attachment 222432

I "liked" your post. I'm not sure I like it, though, because that means I have to source the white T now.

 

[oldtimer]

My hose parted at the quick connect fitting, while on the road Friday evening.
Looked at what I had on hand in tool bag, turns out extensions for 3/8 drive ratchet are a tight fit in and of hose so i drove one into each of the open ends, and drove home.
Cut broken hose, stuffed large bolt in end & applied hose clamp.
No way to plug "T" fitting, so I cut other hose and plugged with bolt.
Drove all weekend with no heater.
Monday morning will order new hoses and "T" fittings and replace every thing.

O7 Denali with 167000 miles

 

[jz57]

Look like the lifespan of those plastic "T" connect is way above 100K miles mark, just replace them as preventive maintenance, when 100K miles maint schedule is up, replace them with spark plugs together, NO need spending money on fancy and expensive alternative ones.

.......

View attachment 222889

O7 Denali with 167000 miles