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

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

j91z28d1

Full Access Member
Joined
Feb 28, 2022
Posts
3,097
Reaction score
3,826
I do have a smaller hose from radiator that connects to the tank above coolant level. Did order a new hose as well. Shouldn't have to plug it as it goes to the radiator I hope? I was going to disconnect it but couldnt find the right size plug and gave up.


I guess yours is different than mine. wonder where the overflow is?
 

j91z28d1

Full Access Member
Joined
Feb 28, 2022
Posts
3,097
Reaction score
3,826
pretty sure the pressure tester fitting covers the overflow hole, it did on the wife 04 and there is little difference on the gmt800's

looking at the screw on part, the seal is at the very top, how mine is setup. I don't thing it would seal it off. the old school kinda that just pushed down and locked with a half turn it did.

but guess mine is pretty different.
 

j91z28d1

Full Access Member
Joined
Feb 28, 2022
Posts
3,097
Reaction score
3,826
I assumed it would just leak out from under the cap? idk


yeah, guess so. wouldn't have expected that. everyone I have has a 2nd hose for a to drain any over flow down and away.

huh. gm.. what can ya do
 

iamdub

Full Access Member
Joined
Apr 23, 2016
Posts
20,821
Reaction score
44,945
Location
Li'l Weezyana
yeah, guess so. wouldn't have expected that. everyone I have has a 2nd hose for a to drain any over flow down and away.

huh. gm.. what can ya do

It's a sealed and pressurized system. There is no "overflow" like the older generations. That which looks like an overflow tank with a pressure-rated "radiator cap" on it is a surge tank. That nipple by the cap is to expel what would get by that cap in an over-expansion or over-pressurization event. If coolant is leaking out of that, then the "rad cap" is leaking and the surge tank is too full.
 

j91z28d1

Full Access Member
Joined
Feb 28, 2022
Posts
3,097
Reaction score
3,826
It's a sealed and pressurized system. There is no "overflow" like the older generations. That which looks like an overflow tank with a pressure-rated "radiator cap" on it is a surge tank. That nipple by the cap is to expel what would get by that cap in an over-expansion or over-pressurization event. If coolant is leaking out of that, then the "rad cap" is leaking and the surge tank is too full.


I get that.. but all 3 of my newer gm cars have it. the yukon and volt have 2, one on both cooling systems.

when I threw a belt at the track on the c6 it emptyed it radiator thru that hose onto the ground. just seems weird for some to have it and others not.
 

avalonandl

Full Access Member
Joined
Apr 6, 2019
Posts
2,200
Reaction score
2,635
Location
Troy, MICH & Naples, FL
Tried replacing the running board motors on Deathscalade but no dice! :mad: motors are corroded to the bracket so returning the running board motors and reordering the motors with new brackets which are $$$ :mad3: I guess this is the perk to driving older stuff but I was hoping I could replace just the motors and not the motor + bracket since the price increase is substantial


/rant
I gave up on the folding running boards and just went with stationary tube boards
 

Forum statistics

Threads
132,366
Posts
1,866,806
Members
96,989
Latest member
Mreedini
Top