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

[Doubeleive]

get the one from autozone it's a big suitcase type kit with probably 10 or more different caps
powerbuilt

 

[mikez71]

get the one from autozone it's a big suitcase type kit with probably 10 or more different caps
powerbuilt
View attachment 402621

Will try them next!

I got one from oreilly's, only had about 5 adaptors.
But honestly I can't see how it would be leaking because I can seal it on my hand..

and it screws on the reservoir with a thick rubber gasket which I can feel compress.

starting to wonder if its an internal head gasket leak or cracked head, and the smell might be coming from tailpipe. doesnt smell in the engine compartment before starting.. noticeable after starting briefly.. exhaust could be blowing back under the car. Bottom of engine and heads looks dry everywhere I can see from underneath..

Video on a cracked head

Might have to pull my valve covers and have a look..

 

[Doubeleive]

Will try them next!

I got one from oreilly's, only had about 5 adaptors.
But honestly I can't see how it would be leaking because I can seal it on my hand..
View attachment 402630
and it screws on the reservoir with a thick rubber gasket which I can feel compress.
View attachment 402631
starting to wonder if its an internal head gasket leak, and the smell might be coming from tailpipe. doesnt smell in the engine compartment before starting.. noticeable after starting briefly.. exhaust could be blowing back under the car. Bottom of engine and heads looks dry everywhere I can see from underneath..

then you can rent the block tester those are like $10 but you will probably have to order the fluid because it's usually not in stock and is not included with the tool rental.
but....this is why I say to mark the reservoir tank level when it is cold as this gives you a better idea of how fast or slow the leak is and a slow internal leak can possibly be addressed without huge cost. if you can smell coolant in the exhaust then your sniffer works much better than mine. look under the oil filler cap for any snot, should be nice and clean though.

 

[Docky50]

I dedicated a lot of time to some mods on my Tahoe this weekend. I replaced my low beam halogen lights with one of HID Guy's kits, plasti dipped my chrome surround on my grille, tried to repaint my front bowtie (FAIL!), replaced my interior lights with LEDs, installed my holster under my steering column, and replaced a seatbelt latch on the driver's seat. Now I'm waiting on my rear door actuators to come in as well as the billet bowties I ordered. As soon as they get here I'll get to installing them too. Long weekend but I got it done. What did you do to your Tahoe/Yukon?

Nothing. It's raining here and I wanted to get it detailed. So I'll just vacuum it out later. I want to replace my bowie with a red lighted one

 

[gooffeyguy]

Harbor freight sells a combustion tester and also sells the testing fluid for it.

 

[mikez71]

Harbor freight sells a combustion tester and also sells the testing fluid for it.

Thanks for that. I'm also thinking there is a chance if the crack is around the intake that no combustion contamination would be present.
Oil cap, tailpipe and coolant seem normal.. Hoping it's something simpler but there is no sign of exterior leaks..

 

[mikez71]

but....this is why I say to mark the reservoir tank level when it is cold as this gives you a better idea of how fast or slow the leak is and a slow internal leak can possibly be addressed without huge cost. if you can smell coolant in the exhaust then your sniffer works much better than mine. look under the oil filler cap for any snot, should be nice and clean though.

yep i had it filled to the line, now it is below, however Im not sure I refilled after bypassing the heater cores, but I think I did..

Cant smell coolant in exhaust while running, just speculating it gets pushed out on first crank..

Might try those coolant tabs after all, but I'm going to see if a new reservoir does anything. (and i will check with autozones pressure tester also)

 

[Tonyrodz]

yep i had it filled to the line, now it is below, however Im not sure I refilled after bypassing the heater cores, but I think I did..

Cant smell coolant in exhaust while running, just speculating it gets pushed out on first crank..

Might try those coolant tabs after all, but I'm going to see if a new reservoir does anything. (and i will check with autozones pressure tester also)

Nvm

 

[mikez71]

After starting the truck, I ran to the exhaust pipe.. Smelled coolant.
I'm hoping it's headgasket and not a cracked head at this point. Might pop the valve covers little later

 

[Sparksalot]

After starting the truck, I ran to the exhaust pipe.. Smelled coolant.
I'm hoping it's headgasket and not a cracked head at this point. Might pop the valve covers little later

Doing a block check test can help narrow it down too. It detects combustion products in the coolant.

https://www.amazon.com/Block-Tester-BT-500-Combustion-Leak/dp/B06VVBSFTF