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Im sorry, but it is kind of funny GM 21-NA-199

14burrito
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14burrito
14burrito

Plenty of discussions with the dealer and techline in regards to the operating temps that GM set forth on the powertrain for our Tahoe. They said both engine and gearbox temps were normal and as expec

M1ck3y
M1ck3y

They'll get to the 8 spd once it get's closer to the end of it's life cycle.

newdude
newdude

End of the day it all came down to CAFE/Fuel economy ratings.  The faster the trans got to operating temp, the faster it could produce less friction, the faster it gets better fuel economy.    

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BlaineBug Enthusiast

BlaineBug

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Correct me if I am wrong but here are 4 lines I see running to my radiator and the condenser up front. 2019 Yukon with active aero shutters in the grille.  All 4 lines are the same quick disconnect style with the clip and plastic retainer.  Are all transmission related?  I didn't think the A/C lines used quick disconnects like these, but I'm also not sure where the engine oil cooler goes.  As far as I am aware there was an engine oil cooler.  I do not have a factory towing package, as in, no integrated trailer brake controller in the dashboard and no 2-speed transfer case (2wd, auto, 4-hi only.)

20211210_125127.jpg

20211210_125235.jpg

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dieselfan1 Senior Enthusiast

dieselfan1

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3 hours ago, dieselfan1 said:

I'll have more cold weather data here shortly.

Its around -13F here this morning and I have to drive about 22 miles. I'm expecting it to get up to around 100°.

Temp was -12°F , around 15 minute warm up. 

Trans temp was 37°F out of the driveway. 

Drove a mile to Dennys. Trans now 60°F.

Shut truck off for 20 minutes. 

Remote started it when I finished my eggs. Ate the rest of my grand slam and I was back in truck exactly 30 minutes later . Trans now 64°F.

Drove about 8 miles at 40 mph and stopped for gas. Trans now 118°F.

Cooled down to 114°F while idling 4-5 minutes. 

Drove another 12 miles at 55mph and watched it drop to 88°F. 

I think if I got on the interstate she would really cool down.

 

I got to think about this. I got at least 2 more months of below zero B.S.

I'm not really feeling crawling under it and re flipping it.

I'm also not feeling the 158 kit 

I like it flipped when it's hot in the summer.

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BlaineBug Enthusiast

BlaineBug

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Posted (edited)

The 158' kit is worthwhile.  If you're like me you can sell your original setup for $40-$50 and be into the new thermostat for only around $20 😁

If someone is going to tap and drill the old housing for a plug I'd rather have a spare on hand just in case something cracks or gets damaged in the process rather than being out of a vehicle for god knows how long.  That's the value in the old units.

Edited by BlaineBug
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dieselfan1 Senior Enthusiast

dieselfan1

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44 minutes ago, BlaineBug said:

The 158' kit is worthwhile.  If you're like me you can sell your original setup for $40-$50 and be into the kew thermostat for only around $20 😁

My pill is flipped.  That was Free.

I don't drive a ton in the winter so I may just leave it 

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14burrito Enthusiast

14burrito

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On 12/11/2021 at 10:47 AM, BlaineBug said:

Correct me if I am wrong but here are 4 lines I see running to my radiator and the condenser up front. 2019 Yukon with active aero shutters in the grille.  All 4 lines are the same quick disconnect style with the clip and plastic retainer.  Are all transmission related?  I didn't think the A/C lines used quick disconnects like these, but I'm also not sure where the engine oil cooler goes.  As far as I am aware there was an engine oil cooler.  I do not have a factory towing package, as in, no integrated trailer brake controller in the dashboard and no 2-speed transfer case (2wd, auto, 4-hi only.)

20211210_125127.jpg

20211210_125235.jpg

 

Driver side oil cooler?

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14burrito Enthusiast

14burrito

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Posted (edited)
On 12/11/2021 at 10:47 AM, BlaineBug said:

Correct me if I am wrong but here are 4 lines I see running to my radiator and the condenser up front. 2019 Yukon with active aero shutters in the grille.  All 4 lines are the same quick disconnect style with the clip and plastic retainer.  Are all transmission related?  I didn't think the A/C lines used quick disconnects like these, but I'm also not sure where the engine oil cooler goes.  As far as I am aware there was an engine oil cooler.  I do not have a factory towing package, as in, no integrated trailer brake controller in the dashboard and no 2-speed transfer case (2wd, auto, 4-hi only.)

20211210_125127.jpg

20211210_125235.jpg

 

Just walked out to our 19 Tahoe with aero, tow package (not max trailer).

 

Based or RPO we have aux trans and aux oil coolers. 

 

Pass side:

Two larger diameter go to the radiator for aux oil cooling. 

One small diameter is trans to condensor supply.

 

Driver side:

Condenser trans return

 

KC4 - oil cooling system

KNP - HD aux trans cool

Z82 - trailering equipment

NP0- single speed t-case

Edited by 14burrito
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BlaineBug Enthusiast

BlaineBug

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Posted (edited)
21 minutes ago, 14burrito said:

 

Just walked out to our 19 Tahoe with aero, tow package (not max trailer).

 

Based or RPO we have aux trans and aux oil coolers. 

 

Pass side:

Two larger diameter go to the radiator for aux oil cooling. 

One small diameter is trans to condensor supply.

 

Driver side:

Condenser trans return

I don't have an integrated brake controller or two-speed transfer case so I doubt that qualifies me for the tow package (not sure what the difference is between tow package and max trailering package.)  However I did request a build sheet from General Motors and it is listed that I have "KC4 Engine Oil Cooling System" and "KNP Transmission Oil Cooler."  I also have "Z82 Trailering Equipment Package."  G80 rear locker with 3.08 gear ratio.

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14burrito Enthusiast

14burrito

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32 minutes ago, BlaineBug said:

I don't have an integrated brake controller or two-speed transfer case so I doubt that qualifies me for the tow package (not sure what the difference is between tow package and max trailering package.)  However I did request a build sheet from General Motors and it is listed that I have "KC4 Engine Oil Cooling System" and "KNP Transmission Oil Cooler."  I also have "Z82 Trailering Equipment Package."  G80 rear locker with 3.08 gear ratio.

 

As mentioned, neither do I. As well, two small diameter go to condensor. Double check your two larger diameter on the pass side, I bet they actually go to the radiator.

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BlaineBug Enthusiast

BlaineBug

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Posted
1 minute ago, 14burrito said:

 

As mentioned, neither do I. As well, two small diameter go to condensor. Double check your two larger diameter on the pass side, I bet they actually go to the radiator.

I believe 1 and 3 go to the condenser and 2 and 4 go to the radiator in my pictures.

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BlaineBug Enthusiast

BlaineBug

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4 minutes ago, 14burrito said:

 

As mentioned, neither do I. As well, two small diameter go to condensor. Double check your two larger diameter on the pass side, I bet they actually go to the radiator.

PS, is your KNP really labeled "heavy duty auxiliary transmission cooler?" That is not what my build sheet says.

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