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Trans Temp always HOT

Brandin Boisclair

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truckguy82 Senior Enthusiast

truckguy82

Posted
Posted
2 minutes ago, flyingfool said:

190-220 degrees wasn't normal back in 2012 trucks, they ran at 130-160 normal driving conditions.  it's not just the fluid life you should be worried about.. lots of the components that make these transmissions function are made of plastic and rubber. once you hit 180-220 degrees you are just oxidizing and hardening all these soft components that maintain the sealing and pressure to control of the fluids mechanicals function to do its job.,  overtime these soft parts will disintegrate like a set of old wiperblades trying to squeeze water off your windshield,  it just aint gonna work right 

Who is talking about those trucks, this is the k2xx forum, and the op is talking about a k2xx.

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flyingfool Senior Enthusiast

flyingfool

Posted
Posted
2 minutes ago, truckguy82 said:

What in the hell are you talking about. Every single v8 truck from 2014-2018 has this thermostat and they all operate at 190-200 degrees.

 

why would you post such blatantly incorrect jnfo

i think i said that, yes 2014-19 trucks have it.  did i mispell?? not sure if 2500's have a tstat..

truckguy82 Senior Enthusiast

truckguy82

Posted
Posted

Maybe I’m confused

 

all i see is

 

-op said he had a 2014.

-He states he has transmission temps of 190-200

-you say, no that is wrong

truckguy82 Senior Enthusiast

truckguy82

Posted
Posted

Doesn’t matter all that much, i just like to keep the info good for the 1000’s of people that will look at this thread in the next 10 years

flyingfool Senior Enthusiast

flyingfool

Posted
Posted

depends on the build date of the 2014

1000's of people will just ask the same silly questions  over and over without doing a search

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
10 hours ago, Brandin Boisclair said:

Hey everyone, 

 

I’m new to the forum. To start out, I have a 2014 Silverado 1500 5.3 with 65k miles. I’m on 33x12.50 tires and factory gearing(which I believe is 3.42 or 3.24, something like that). I’ve noticed my transmission temp gets hot all the time without towing or driving like an idiot. I’m running around 194-199 driving 80 on the flat interstate with ambient temperature around 60-65°.  The trans is also starting to develop a small flare between 2-3 and 3-4. My local shop said the trans is starting to fail and it didn’t have any codes. I wanted a second opinion so I took it to a reputable transmission shop in town. He told me it was the torque converter starting to fail and that I should replace it and be good to go. He said he has seen this problem before on the 6L80’s and it will fix it. I just figured I’d ask y’all before I pay $1000 to have the converter replaced. Thanks!

Yes, the torque converter failure is common in the 6 speeds, not so much in the 8 speeds, but that does not matter for your truck.

 

You are right in the mileage range when they start to go bad, so I would go with your second opinion in this case and have it replaced, hopefully the cost will include a whole service of the transmission. 

 

If you have a 2014 (K2) your trans temps are fine, can't compare them to the previous models.

Brandin Boisclair Enthusiast

Brandin Boisclair

Posted
  • Author
Posted
On 4/4/2020 at 11:07 AM, UnlimitedMatt said:

I am no expert but those temps are 'normal' for these transmissions.  This is why many of us do the transmission thermostat delete mod. After I did this, my temps never get that hot anymore. 

 

I don't have any ideas on your shifting issues. All I'd suggest is to do a full transmission fluid change. 

 

Good luck!

I looked around the internet and found this aftermarket thermostat and I was wondering if anyone had experience with it? It’s supposed to lower trans temp by 20%

 

https://globaltransmissionparts.com/6l80-6l90-sure-cool-cooler-flow-system-stl010/?gclid=Cj0KCQjwj7v0BRDOARIsAGh37irlrDHDRLCnhLDiGIY1k7wchfDl9rTeJxpjDxzUBhuOUouu0MD4K5IaAgUHEALw_wcB

 

I’m open to other thermostats y’all have experience with as well, thanks!

newdude Senior Enthusiast

newdude

Posted
Posted
On 4/4/2020 at 10:41 AM, Brandin Boisclair said:

Hey everyone, 

 

I’m new to the forum. To start out, I have a 2014 Silverado 1500 5.3 with 65k miles. I’m on 33x12.50 tires and factory gearing(which I believe is 3.42 or 3.24, something like that). I’ve noticed my transmission temp gets hot all the time without towing or driving like an idiot. I’m running around 194-199 driving 80 on the flat interstate with ambient temperature around 60-65°.  The trans is also starting to develop a small flare between 2-3 and 3-4. My local shop said the trans is starting to fail and it didn’t have any codes. I wanted a second opinion so I took it to a reputable transmission shop in town. He told me it was the torque converter starting to fail and that I should replace it and be good to go. He said he has seen this problem before on the 6L80’s and it will fix it. I just figured I’d ask y’all before I pay $1000 to have the converter replaced. Thanks!

 

As others have said...normal.

 

K2 1/2 ton pickups 2014-2019 have an inline thermostat on the transmission lines.  The lines connect to the thermostat, which is bolted to the front left side of the transmission, just behind the bellhousing.  Name of the game is fuel economy so the thermostat keeps closed to warm the transmission fluid faster to reduce friction on the drivetrain.  It then opens around 180F.  

 

2-3 flare can be common and according to GM, normal.  3-4 flare not sure.  Converter failing in a 6L80 is becoming a common sight however.  We've done a good number (chevy dealer).  If they fail long enough/hard enough, it takes out the pump and the rest of the transmission. 

 

My theory on the converter failure?  Two things.  Either GM picked a supplier that had/has issues, or, the way that GM has them tuned to allow slip, especially during AFM transition from V4 back to V8.  However, even with a Range AFM disabler installed, you can still hear the converter doing too much action, even just sneezing on the pedal.  They don't unlock it, they just slip it between 5-50 RPM.  And the thing locks or starts to lock by 2nd gear.   

UnlimitedMatt Enthusiast

UnlimitedMatt

Posted
Posted
23 minutes ago, Brandin Boisclair said:

I looked around the internet and found this aftermarket thermostat and I was wondering if anyone had experience with it? It’s supposed to lower trans temp by 20%

 

https://globaltransmissionparts.com/6l80-6l90-sure-cool-cooler-flow-system-stl010/?gclid=Cj0KCQjwj7v0BRDOARIsAGh37irlrDHDRLCnhLDiGIY1k7wchfDl9rTeJxpjDxzUBhuOUouu0MD4K5IaAgUHEALw_wcB

 

I’m open to other thermostats y’all have experience with as well, thanks!

 

I removed my transmission thermostat and plugged it . All I had to buy was a small plug.  I followed a YouTube video and it was fairly easy.

flyingfool Senior Enthusiast

flyingfool

Posted
Posted
On 4/4/2020 at 6:39 PM, JimCost2014 said:

Yes, the torque converter failure is common in the 6 speeds, not so much in the 8 speeds, but that does not matter for your truck.

 

You are right in the mileage range when they start to go bad, so I would go with your second opinion in this case and have it replaced, hopefully the cost will include a whole service of the transmission. 

 

If you have a 2014 (K2) your trans temps are fine, can't compare them to the previous models.

actually there are higher failures on the 8 speed trans , you can compare apples to apples, the old 6 speed in my 2012 truck runs cool 130 degrees,  and its the same transmission thats in the newer 15-18' year trucks with 6 speeds

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
8 minutes ago, flyingfool said:

actually there are higher failures on the 8 speed trans , you can compare apples to apples, the old 6 speed in my 2012 truck runs cool  and its the same transmission thats in the newer 15-18' year trucks with 6 speeds

Speaking from personal experience, and talking with the dealer that replaced the convertor in our 16 Tahoe.

 

Technically, there are differences between your 12, and the K2's:

K2 1/2 ton pickups 2014-2019 have an inline thermostat on the transmission lines.  The lines connect to the thermostat, which is bolted to the front left side of the transmission, just behind the bellhousing.  Name of the game is fuel economy so the thermostat keeps closed to warm the transmission fluid faster to reduce friction on the drivetrain.  It then opens around 180F.  

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

" Normal"? The question has two faces. One asks if the noted temperature is within that models design parameters. The other asks if it is optimal. The answers to both are surprisingly simple.

 

Does it have a thermostat? If the answer is yes then yes it's 'normal'. If it does not have a thermostat then no, it's not normal.

 

Is 190 to 200 F optimal. Depends. If efficiency is your goal then yes. If longevity and reliability are the goal, then no.

 

Only the OP can answer any of that. He has to look and then decide what is more important to him. Fuel or reliability.

 

:chill: 

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