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Transmission Cooler

dna9656
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dna9656 Enthusiast

dna9656

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I have 2015 Silverado LTZ 4 door, 4 X 4. I have RPO code KNP Transmission Cooler. Now the "cooler" most automatics have is a pipe in the radiator tank and there is no code for that; it's part of the Transmission standard equipment. Can I assume this is a separate cooler (like a little radiator?) Where is it? I see nothing like a GM tranny cooler I have seen on the '04 S 10s... I looked through the grill....

rav3 Senior Enthusiast

rav3

Posted
Posted

I'm not sure about your '15 but my '17 LTZ wt 5.3L & 6 speed 6L80 has the cooler intergrated into the top potion of the A/C condensor. No separate cooler like in the past and there is a transmission thermostat valve on the side of the transmission, which I disabled via the 'pill flip'.

newdude Senior Enthusiast

newdude

Posted
Posted
1 hour ago, dna9656 said:

I have 2015 Silverado LTZ 4 door, 4 X 4. I have RPO code KNP Transmission Cooler. Now the "cooler" most automatics have is a pipe in the radiator tank and there is no code for that; it's part of the Transmission standard equipment. Can I assume this is a separate cooler (like a little radiator?) Where is it? I see nothing like a GM tranny cooler I have seen on the '04 S 10s... I looked through the grill....

 

 

2015 will go transmission to radiator, radiator out to the aux cooler that is part of the AC condenser then back to the transmission.    

 

Should look like this:

 

5.32014-early2016.thumb.jpg.8d60114d69685bc40317866631cfbd65.jpg

 

 

 

Enters bottom driver's side of the rad from the out flow line, flows to the top and exits at the top out to the aux via #14, then comes out of pipe #5 in the drawing and connects back to the transmission input line.  

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rav3 Senior Enthusiast

rav3

Posted
Posted
32 minutes ago, newdude said:

 

 

2015 will go transmission to radiator, radiator out to the aux cooler that is part of the AC condenser then back to the transmission.    

 

Should look like this:

 

5.32014-early2016.thumb.jpg.8d60114d69685bc40317866631cfbd65.jpg

 

 

 

Enters bottom driver's side of the rad from the out flow line, flows to the top and exits at the top out to the aux via #14, then comes out of pipe #5 in the drawing and connects back to the transmission input line.  

Are the '17s like this?

newdude Senior Enthusiast

newdude

Posted
Posted
11 hours ago, rav3 said:

Are the '17s like this?

 

 

No.  They only use the condenser combi cooler for cooling the transmission.  They removed the radiator from the cooling path.  When you pill flip or surecool these, they run much cooler than the 14-16 trucks above.  Struggle to get above 100-110F in the winter, 130-145F in the summer (on a known good transmission that isn't slipping).  Mine wouldn't get over 100F in the winter, summer I could beat the snot out of it on a 90 degree day and wouldn't break 145F. 

 

2016.5-2019 classic/LD:

 

late2016-2019classic.jpg.8828f6169ffd6cd57253f0e49b3fcb0e.jpg

 

 

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rav3 Senior Enthusiast

rav3

Posted
Posted

Where are u finding the parts alliteration? 

dna9656 Enthusiast

dna9656

Posted
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Posted
On 4/3/2024 at 5:57 PM, newdude said:

 

 

2015 will go transmission to radiator, radiator out to the aux cooler that is part of the AC condenser then back to the transmission.    

 

Should look like this:

 

5.32014-early2016.thumb.jpg.8d60114d69685bc40317866631cfbd65.jpg

 

 

 

Enters bottom driver's side of the rad from the out flow line, flows to the top and exits at the top out to the aux via #14, then comes out of pipe #5 in the drawing and connects back to the transmission input line.  

 My cooler lines go to the side tank closest to the engine; I believe that's the radiator as i have never seen a condenser with side tanks like a radiator does. Pics later today.

newdude Senior Enthusiast

newdude

Posted
Posted
1 hour ago, dna9656 said:

 My cooler lines go to the side tank closest to the engine; I believe that's the radiator as i have never seen a condenser with side tanks like a radiator does. Pics later today.

 

 

Look at that picture again.  Condenser, the top 1/5-1/4 of it is the transmission cooler.  The rest of it is all for the AC operation.  Its called a Combi Cooler.  All of the V8s 14-19 use this.

 

 

TCW4422047_1.jpg

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Douglas Nathan Enthusiast

Douglas Nathan

Posted
Posted (edited)
32 minutes ago, newdude said:

 

 

Look at that picture again.  Condenser, the top 1/5-1/4 of it is the transmission cooler.  The rest of it is all for the AC operation.  Its called a Combi Cooler.  All of the V8s 14-19 use this.

 

 

TCW4422047_1.jpg

So then there's NO WAY I can have engine coolant in my tranny fluid? 

 

As you can see, I have no more white streaks. I have beautiful transmission fluid!

20240405_091926.jpg

Edited by Douglas Nathan
newdude Senior Enthusiast

newdude

Posted
Posted (edited)
6 minutes ago, Douglas Nathan said:

So then there's NO WAY I can have engine coolant in my tranny fluid?

20240405_091926.jpg

 

 

You could if the radiator is leaking into the transmission cooler tank in the radiator.  

 

That just looks like old ATF.  does it smell like coolant?  

Edited by newdude
newdude Senior Enthusiast

newdude

Posted
Posted
2 minutes ago, Douglas Nathan said:

So then there's NO WAY I can have engine coolant in my tranny fluid?

 

 

Direction of flow for 14-16 V8.  Transmission to radiator tank side cooler, out to the condenser combi cooler, back to the transmission.14-16.thumb.png.d338029e5a4f54d0217aedecd4d147d5.png

 

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dna9656 Enthusiast

dna9656

Posted
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Well, I have not seen what's shown here, Just what you can see from the engine side of the radiator when it's all installed. The fluid is a week old, it's Dexron VI filtered through an AC Delco tranny filter. I hope to get a Purolator filter (they are the finest filtering filter on the US market (except for maybe Amsoil by-pass filter); It's hard to find a Purolator dealer, Tractor Supply Company is one, I assume the Purolator name is well known in the farming community. Anyway...Thanks for your input and for clarifying what I have in my new to me truck!

  • 1 year later...
spoolin98 Enthusiast

spoolin98

Posted
Posted
On 4/5/2024 at 12:27 PM, newdude said:

 

Direction of flow for 14-16 V8.  Transmission to radiator tank side cooler, out to the condenser combi cooler, back to the transmission.14-16.thumb.png.d338029e5a4f54d0217aedecd4d147d5.png

 

 

 

I am currently pulling the motor from my 14 and I am looking to delete the factory trans cooling system completely and run a separate cooler in the grill with an improved racing thermostat on the trans.  Do you know, will a 2017 5.7 radiator fit in my 2014 perfectly?  My OEM rad has 90k miles on it and I know they are known to leak; I figured while I am in there, I will replace it with a new one.  I won't need the trans cooling part of the 2014 radiator anymore so I am hoping a 2017 will bolt right in.  

davester Senior Enthusiast

davester

Posted
Posted

a "racing" thermostat?  somebody has too much money...  Just flip the pill so all the fluid goes through the cooler all the time, or use the lower temp thermostat from gm.

spoolin98 Enthusiast

spoolin98

Posted
Posted
9 hours ago, davester said:

a "racing" thermostat?  somebody has too much money...  Just flip the pill so all the fluid goes through the cooler all the time, or use the lower temp thermostat from gm.

 The brand is "improved racing", it's not a racing thermostat.  What part of "I am looking to delete the factory trans cooling system completely" do you not comprehend?  What I am doing costs less than $300 total, worry about your own money.  I asked about the radiator, if you have no input on that, then mind your business.  

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