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

[wjburken]

Appreciate your response. Next question is, there is no room for a drill to fit in there between the pan and the chassis. Thoughts?

Can’t you drop the cross member?

 

[gooffeyguy]

Is your drain plug going toward the rear or the passenger side?

 

[89Suburban]

No it faces the pass side only about 12” of clearance tops to the frame rail.

 

[Doubeleive]

Need some radiator advice. At 152k, it looks to be the original rad. I’ve been suspicious of a small leak. Did a pressure test at 15psi (overflow tank cap says 20psi) and it appears to be leaking at the driver side. Are these prone to leak here? I drove it approx 10 miles round trip and didn’t experience a large coolant loss. Just trying to figure out if I’m shopping for a radiator@swathdiver

the plastic ends get hairline cracks

 

[swathdiver]

Need some radiator advice. At 152k, it looks to be the original rad. I’ve been suspicious of a small leak. Did a pressure test at 15psi (overflow tank cap says 20psi) and it appears to be leaking at the driver side. Are these prone to leak here? I drove it approx 10 miles round trip and didn’t experience a large coolant loss. Just trying to figure out if I’m shopping for a radiator@swathdiver

Sure is a leak, glad you caught it now, while it's small, before got larger and stranded you somewhere. I was just thinking about them the other night, RA had those for about $220 for a GM OE and they are $400+ for the ones with the engine oil cooler. Must be using gold fittings!

Just serviced my baby. Oil and filter change. Remember my oil drain plug got stripped out at the service shop and it had heli coil stuck on it? I confirmed there are no heli coil pieces stuck in the hole. It's completely stripped out smooth and measures .460 on the dial caliper. Now I have to research a repair for this. Anybody been down thus path? I am hoping not to use helicoil again, seeing as it already failed. Drill tap the hole for a bigger bolt? Or some kind of threaded insert?

I also changed the air filter with a Delco replacement. Of course I forgot to plug the MAF sensor wire back in. So it threw codes P0102 & P0113. This also caused the service stabilitrac and service traction control warnings. Of course I panicked with all the lights and bells going off. Started to loose my cool, had to pull the Fonz out and chill. Realized "Hey jaggazz, you forgot a plug." Plugged it in and cleared the codes and all seems good. So future reference if anybody else goes through this.

Yeah, I've never had a helicoil fail. Must not have been done right.

 

[avalonandl]

I have a CT 5 V on order. 3.0 TT A10, Super cruise, premium pkg, Nav, RWD, All Season tires. Shadow metallic and whisper beige performance seats.

 

[Charlie207]

Need some radiator advice. At 152k, it looks to be the original rad. I’ve been suspicious of a small leak. Did a pressure test at 15psi (overflow tank cap says 20psi) and it appears to be leaking at the driver side. Are these prone to leak here? I drove it approx 10 miles round trip and didn’t experience a large coolant loss. Just trying to figure out if I’m shopping for a radiator@swathdiver

fudge.

I went out and checked mine after it had run for a bit, and I'm seeing some seeping in the same area. Why does this have to happen in Feb? I prefer changing radiators in June.

 

[Doubeleive]

fudge.

I went out and checked mine after it had run for a bit, and I'm seeing some seeping in the same area. Why does this have to happen in Feb? I prefer changing radiators in June.

hot&cold constantly does it, after 5 years there questionable in my book

 

[alpha_omega]

I have a Cold Case in my 2012. It's a 2-row with oil and transmission fluid coolers in the end tanks. The 6.2 generates more heat than the 5.3, yet uses the same cooling setup from the factory. I've found that it's not adequate for towing near the limits in hot weather in the mountains (7,000 lb camper, 90ºF+ outside temps). I was seeing coolant temps of 240º+ in hot weather over the hills with the factory radiator (via OBD2 port), and with the Cold Case I see 210-220ºF in the same conditions.

Did we ever come to a conclusion on the fan upgrade? I know we all had meters out one day checking the cfm, but we also all had different variables (different Rads, coolers in different locations, some had missing baffles) so I can’t remember if we ever came to a conclusion about the fan swap.

What’s this magical radiator thread you speak of?

It’s a thread that @Geotrash started and unbeknownst to him, several of us blew it up discussing it along with a multitude of other random topics, amidst poking fun at and bouncing ideas off one another (not unlike this thread). Tread carefully though, as you may get lost among the madness.

I know @Monz11 just put a new one in, but I think she went with the Mishimoto vs the Coldcase that others have recently mentioned. Plus still doing her rebuild she may not have had time to “scientifically” compile data like @Geotrash @Sparksalot @Tonyrodz and @Doubeleive

Keeping coolant and transmission temps under control when towing in the summer heat

Hi All, the 2012 XL Denali is a towing beast, but after the cam upgrade, new HD torque converter, and adding the Tru-Cool 40K in front of the radiator, the engine itself is running warm now that we're getting into spring. Hauled our 6500 lb camper down to Virginia Beach this weekend in 83º...

www.tahoeyukonforum.com

*also someone recently posted some info/photos about not having to do as much trimming of the radiator cover or fan shroud when installing their aftermarket radiator, but I can’t recall who it was.

 

[Doubeleive]

Did we ever come to a conclusion on the fan upgrade? I know we all had meters out one day checking the cfm, but we also all had different variables (different Rads, coolers in different locations, some had missing baffles) so I can’t remember if we ever came to a conclusion about the fan swap.

It’s a thread that @Geotrash started and unbeknownst to him, several of us blew it up discussing it along with a multitude of other random topics, amidst poking fun at and bouncing ideas off one another (not unlike this thread). Tread carefully though, as you may get lost among the madness.

I know @Monz11 just put a new one in, but I think she went with the Mishimoto vs the Coldcase that others have recently mentioned. Plus still doing her rebuild she may not have had time to “scientifically” compile data like @Geotrash @Sparksalot @Tonyrodz and @Doubeleive

Keeping coolant and transmission temps under control when towing in the summer heat

Hi All, the 2012 XL Denali is a towing beast, but after the cam upgrade, new HD torque converter, and adding the Tru-Cool 40K in front of the radiator, the engine itself is running warm now that we're getting into spring. Hauled our 6500 lb camper down to Virginia Beach this weekend in 83º...

www.tahoeyukonforum.com

*also someone recently posted some info/photos about not having to do as much trimming of the radiator cover or fan shroud when installing their aftermarket radiator, but I can’t recall who it was.

I never did a comparison test of my 700w versus a 500w but now that I think of it the wife's 05 is most likely a 500w I will try to get them both up at full speed and compare going to be a busy day so might end up being a couple days, plus it's cold out so going to have to be in the afternoon sometime

 

[RooTBeeRthe1st]

Did we ever come to a conclusion on the fan upgrade? I know we all had meters out one day checking the cfm, but we also all had different variables (different Rads, coolers in different locations, some had missing baffles) so I can’t remember if we ever came to a conclusion about the fan swap.

It’s a thread that @Geotrash started and unbeknownst to him, several of us blew it up discussing it along with a multitude of other random topics, amidst poking fun at and bouncing ideas off one another (not unlike this thread). Tread carefully though, as you may get lost among the madness.

I know @Monz11 just put a new one in, but I think she went with the Mishimoto vs the Coldcase that others have recently mentioned. Plus still doing her rebuild she may not have had time to “scientifically” compile data like @Geotrash @Sparksalot @Tonyrodz and @Doubeleive

Keeping coolant and transmission temps under control when towing in the summer heat

Hi All, the 2012 XL Denali is a towing beast, but after the cam upgrade, new HD torque converter, and adding the Tru-Cool 40K in front of the radiator, the engine itself is running warm now that we're getting into spring. Hauled our 6500 lb camper down to Virginia Beach this weekend in 83º...

www.tahoeyukonforum.com

*also someone recently posted some info/photos about not having to do as much trimming of the radiator cover or fan shroud when installing their aftermarket radiator, but I can’t recall who it was.

Yeah, the new end tanks fit the shroud without modifications. The old end tanks need the shroud to be modified from my experience.

 

[Geotrash]

Did we ever come to a conclusion on the fan upgrade? I know we all had meters out one day checking the cfm, but we also all had different variables (different Rads, coolers in different locations, some had missing baffles) so I can’t remember if we ever came to a conclusion about the fan swap.

I ended up replacing the driver's side fan motor and blades with the 700w version because I had to pull the radiator for my third cam swap anyway, but it was after all of my towing in the peak of summer, so I didn't have a chance to really analyze how much of a difference it made.

What I can say is that I never had cooling problems at idle with the original fans, but I would see considerable coolant temperature rise on the hills that would slow once the fans kicked up to high on a climb. My expectation is that the 700w fan will stop the temperature rise on a long climb completely but I won't know for sure for a few months yet.

 

[alpha_omega]

Yeah, the new end tanks fit the shroud without modifications. The old end tanks need the shroud to be modified from my experience.

Are you referring to Coldcases older design style vs their new one?

 

[Sparksalot]

Are you referring to Coldcases older design style vs their new one?

I think they made a running design change. My tanks are "yuge", and nothing required trimming.

 

[RooTBeeRthe1st]

Are you referring to Coldcases older design style vs their new one?

Indeed

 

[Monz11]

Did we ever come to a conclusion on the fan upgrade? I know we all had meters out one day checking the cfm, but we also all had different variables (different Rads, coolers in different locations, some had missing baffles) so I can’t remember if we ever came to a conclusion about the fan swap.

It’s a thread that @Geotrash started and unbeknownst to him, several of us blew it up discussing it along with a multitude of other random topics, amidst poking fun at and bouncing ideas off one another (not unlike this thread). Tread carefully though, as you may get lost among the madness.

I know @Monz11 just put a new one in, but I think she went with the Mishimoto vs the Coldcase that others have recently mentioned. Plus still doing her rebuild she may not have had time to “scientifically” compile data like @Geotrash @Sparksalot @Tonyrodz and @Doubeleive

Keeping coolant and transmission temps under control when towing in the summer heat

Hi All, the 2012 XL Denali is a towing beast, but after the cam upgrade, new HD torque converter, and adding the Tru-Cool 40K in front of the radiator, the engine itself is running warm now that we're getting into spring. Hauled our 6500 lb camper down to Virginia Beach this weekend in 83º...

www.tahoeyukonforum.com

*also someone recently posted some info/photos about not having to do as much trimming of the radiator cover or fan shroud when installing their aftermarket radiator, but I can’t recall who it was.

nope, he's finishing up the trans lines and building out the exhaust. I left it when I moved up to North Cackalacky and he is a few weeks out from even starting. Custom hot rod shop, so he is aware of what needs to be done and properly. dyno, tune, program ecu, etc. He'll have it for another month, I think.
I'm heading back to see my ortho doc, tore my labrum, and pulled out the anchor, from previous rotator cuff surgery in June 20, so I'm going to be going back under the knife soon. So, I'm in no hurry to get her back. I mean I am, but I can't drive her back, til I'm fixed.! Frustrated, my season is non-existent this year, but at least I will be fixed and back to training before Paris 2024!!!

 

[Monz11]

Indeed

don't forget Atomic has the aluminum fan shroud that will work wonders, with new blades!!

 

[Fubar0715]

I just put a Coldcase in thecopcar. I had it in 2 days from Summit, and it bolted right in. My original burst in the middle of Big Bend after only 203K of break in service. Same tank btw.

203k of break in service-only driven to church and the grocery store on Sunday by a feeble old woman?

I see more holes that Swiss cheese in that story sir!

 

[George B]

 

[George B]

Greeted with a P2135 this morning.