What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Chrismnj]

Engine coolant crossover pipe

 

[swathdiver]

Engine coolant crossover pipe

AKA Steam Vent Line

 

[Chrismnj]

AKA Steam Vent Line

Correct

 

[osidesurfer365]

Thank you! Does that include the base and seal? It appears it to be leaking out where the oval piece meets the block.


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[BG1988]

Hit a piece of wood with two LARGE nails at 30 MPH yesterday lucky no damage. barely cleared the air dam..
Tires are ok

SUV after all
I did some OFF WOODING lol


I was able to avoid the much larger piece That would have torn off the bumper or air dam for sure


she still drives True and straight..

 

[Chrismnj]

Thank you! Does that include the base and seal? It appears it to be leaking out where the oval piece meets the block.


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It includes the base, I don’t believe there is a seal there, or it may have o-ring

 

[Drok]

Yeah FYI those covers apparently are a special order item from dealers and big box auto parts stores. Plan accordingly; I ordered that one from RockAuto.

These are the bolts I ordered. I would order them them slightly longer.

Hex Serrated Flange Bolt 18-8 SS - 5/16-18 x 5/8" (FT) , $11 for 25

I would get 3/4” length ($18.25 for 25) if I had to do this again even though my 5/8” long ones barely fit well.

https://www.albanycountyfasteners.c...ource=yotpo&utm_medium=email&utm_campaign=map




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3/4” wont be too long? Was gonna get the ones from the chevy dealer i work at until he told me they were about $4.80 each my cost wtf...

 

[trailblazer]

3/4” wont be too long? Was gonna get the ones from the chevy dealer i work at until he told me they were about $4.80 each my cost wtf...

The OEM bolts are longer than 5/8. I bought 5/8 as that is what the spec is but the OEM ones are like 1” but have threads to about 3/4. I need to dig them out of the trash and measure accordingly or you can pull one out and measure. Note that the OEM ones have the long unthreaded part at the end like the body bolts; pilot end? I can’t think of the name of that feature.


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[Drok]

The OEM bolts are longer than 5/8. I bought 5/8 as that is what the spec is but the OEM ones are like 1” but have threads to about 3/4. I need to dig them out of the trash and measure accordingly or you can pull one out and measure. Note that the OEM ones have the long unthreaded part at the end like the body bolts; pilot end? I can’t think of the name of that feature.


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Yea i get what ya mean. I had the exact bolt written down but cant seem to find it now haha.

 

[iamdub]

Thank you! Does that include the base and seal? It appears it to be leaking out where the oval piece meets the block.


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The older style used special gaskets (GM part number 12551933) that I've only been able to find at the dealer or online OEM parts suppliers. Dorman #56390 is the same. The newer stuff uses an O-ring. I had an assortment of Viton O-rings from Harbor Freight and used four that fit. I say four cuz there are two at the front and two at the back. On your motor, the two at the front are connected with that pipe and the two at the back are just block-offs.

Underside of those pieces. Use a pick or tip of knife to peel out the old O-ring, clean the metal, then slip on the new O-ring. Tighten the bolt to 106 in. lbs., or .37 grunts.

This is a pic of one of the rear ones used as a block-off. The front is the same except it's connected to the other side with that tube.