Borrowed FIL's truck, now it is leaking. 6.6L LB7

[grundyo]

All,

Hoping this group can help me out. I've been using my father-in-laws truck (2003 3500 Duramax 6.6L) for the past few months for a house project and it has recently (last 2 week) developed a leak. I've tried to track down the issue but I'm not really sure what I'm looking at and having a hard time figuring it out.

While the engine is running and moving this leaks, when stopped and engine is off no additional leaks once cooled. This appears to be at the rear of the head on the passenger side. The leak is small, but after a longer drive it appears to leak significantly more

Photo 1 shows the general area, photo 2 shows the specific area the leak is coming from.

Any help or guidance you can provide is appreciated.

 

[clrussell]

Is it dripping from above onto it?

Looks like a heater fitting leaking onto the cyl head

 

[TheBac]

What color is the fluid thats leaking? That alone will tell you where to start looking.

 

[grundyo]

Is it dripping from above onto it?

Looks like a heater fitting leaking onto the cyl head

NAILED IT .... thank you so much for the help on this. This is a photo looking up from the previous photos

 

[Leadfoot]

NAILED IT .... thank you so much for the help on this. This is a photo looking up from the previous photos
View attachment 111582

What is the fix for this? I've never dealt with a heater core on these trucks. Is it the plastic leaking or the hose. Hose is easy to replace, but what if it's the fitting (kind of looks that way from the pic)?

 

[1FastBrick]

What is the fix for this? I've never dealt with a heater core on these trucks. Is it the plastic leaking or the hose. Hose is easy to replace, but what if it's the fitting (kind of looks that way from the pic)?

Its likely the plastic fitting. Sometimes they crack, sometimes its just the O-ring inside. But they are cheap enough to replace as an assembly. Hose with the fitting.

 

[clrussell]

Its likely the plastic fitting. Sometimes they crack, sometimes its just the O-ring inside. But they are cheap enough to replace as an assembly. Hose with the fitting.

Yup. Replace the heater fitting. Any good parts store will have them.

You’ll more than likely break the old brittle one removing it.

Cheap easy fix.

Not so cheap if you don’t fix

 

[shakenfake]

I believe there are metal replacements that are less prone to cracking like the plastic are.

I have never used one before though just seen them.

 

[Chevy1925]

yeah you can get metal ones at the big parts stores now.

 

[1FastBrick]

I have only seen the PPE Stainless unit. Do either of you know who makes the the one for the parts stores? Like is it a doorman part or something?

1999-2016 GM Stainless Steel Heater Hose Connector

Heater Hose Connector - Stainless Steel Heater Hose Connector - Stainless Steel The plastic HVAC heater hose connectors are a common failure point when the older part fatigues from heat and vibration. This PPE Stainless Steel Heater Hose Connector will

ppepower.com

 

[Bdsankey]

I have only seen the PPE Stainless unit. Do either of you know who makes the the one for the parts stores? Like is it a doorman part or something?

1999-2016 GM Stainless Steel Heater Hose Connector

Heater Hose Connector - Stainless Steel Heater Hose Connector - Stainless Steel The plastic HVAC heater hose connectors are a common failure point when the older part fatigues from heat and vibration. This PPE Stainless Steel Heater Hose Connector will

ppepower.com

Dorman makes stainless ones that also don't carry PPE's "we copied someone" tax (so Dorman is ~$5-$8 cheaper per connector).

 

[1FastBrick]

Dorman makes stainless ones that also don't carry PPE's "we copied someone" tax (so Dorman is ~$5-$8 cheaper per connector).

Ok , I found it. Thanks. I didn't know they had those and they are stainless.

Dorman 800-409HP Coolant Connector​

 

[1FastBrick]

GM 15032062 is the White Inlet side connector.

The Black Outlet side comes on the hose assembly.

Should always verify The part number is correct for your application but I found these assembly's
GM 15768212 for 01-04
GM 15196471 for 04-05
GM 25800640 for 06-10

 

[grundyo]

Follow-up, it was the

What is the fix for this? I've never dealt with a heater core on these trucks. Is it the plastic leaking or the hose. Hose is easy to replace, but what if it's the fitting (kind of looks that way from the pic)?

it was the plastic fitting. Somewhat easy fix, just had to get the right tool ($10) to remove the integrated clamp that was part of the fitting.

 

[turbovan]

Ok , I found it. Thanks. I didn't know they had those and they are stainless.

Dorman 800-409HP Coolant Connector​

Are they both the same part?