[HamdanHC]

Hi Every One ,

I have some issue with my transmission
that it get heated when I in traffic jam
and it show me that transmission heat massage
more than 270F ( More than 120-128 C )

I wanna know if there someone have got this issue and solve it.
My car is modified.

 

[baabootoo]

Bigger/more cooler with a separate fan?

 

[SickToo]

Don’t hp90’s have a tstat? I would be looking there first. How many miles are on it?

 

[Unholy707]

Don’t hp90’s have a tstat? I would be looking there first. How many miles are on it?

They do, mine has never gotten over 220 F and takes forever to get there even with a 3.70 putting it through the ringer on the highway

 

[SickToo]

Should take a while the converter is locked on the highway

Even mine

 

[Spartacus]

Start at the beginning....

Check trans fluid, and trans cooler.

 

[ostmike]

What is the ambient air temp when you are sitting in traffic? Assuming that it not abnormally high I would recommend having a competent shop or the dealer check the transmission cooling system. That is definitely too hot for normal ambient temps.

 

[Unholy707]

What is the ambient air temp when you are sitting in traffic? Assuming that it not abnormally high I would recommend having a competent shop or the dealer check the transmission cooling system. That is definitely too hot for normal ambient temps.

Nice to see a great vendor posting on here and offering guidance!

 

[ostmike]

Nice to see a great vendor posting on here and offering guidance!

My pleasure. I am trying to watch this forum each morning to see if there are any technical or tuning questions I can provide a response to.
Also, I would encourage the OP to post what was required to resolve the issue if it was determined that an issue existed for others to reference in the future.

 

[baabootoo]

Start at the beginning....

Check trans fluid, and trans cooler.

BINGO! Ockham's Razor........

 

[Unholy707]

if you can’t/won’t get it diagnosed, follow RTCPF.
Replace The Cheapest Part First

 

[Unholy707]

I got new trans cooler lines for my car came assembled with new thermostatic bypass (only way to order it I believe) was $150 or something like that

 

[Unholy707]

If you’re having shifting issues as well could be pump going, which means trans needs to be pulled. Go get it diagnosed

 

[HamdanHC]

What is the ambient air temp when you are sitting in traffic? Assuming that it not abnormally high I would recommend having a competent shop or the dealer check the transmission cooling system. That is definitely too hot for normal ambient temps.

101 F , I have get the car from the dealership and they say normal temp till the car Goes out the warranty and still I didn’t get solved
I took it to workshop they till me that they will remove the gear thermostat and I keep it direct but the main thing the gear temp it goes very down nearly 104 F. And it will make issue with gear map in future. Any link it will help for buying a cooler or a setup to make tran temp down.

 

[HamdanHC]

Bigger/more cooler with a separate fan?

I have modified with heat exchanger from Bwoody
And I get canceled the OEM cooler for coolant.

 

[HamdanHC]

Don’t hp90’s have a tstat? I would be looking there first. How many miles are on it?

74578 miles

 

[Frosty]

I have modified with heat exchanger from Bwoody
And I get canceled the OEM cooler for coolant.

Are you saying you removed the OEM transmission cooler in favor of something to cool the coolant (for the engine or Supercharger)? If so, this is why your transmission is running hot. You need a cooler in the system.

 

[SickToo]

I have modified with heat exchanger from Bwoody
And I get canceled the OEM cooler for coolant.

I do not understand what that is but 75000 miles there is gonna be a lot of clutch dust in the fluid if it and filter wasn’t changed. I would change those and bypass the tstat for band aide. Start saving $$$

 

[HamdanHC]

Are you saying you removed the OEM transmission cooler in favor of something to cool the coolant (for the engine or Supercharger)? If so, this is why your transmission is running hot. You need a cooler in the system.

Not the transmission cooler
I have been remove the coolant cooler

 

[HamdanHC]

I do not understand what that is but 75000 miles there is gonna be a lot of clutch dust in the fluid if it and filter wasn’t changed. I would change those and bypass the tstat for band aide. Start saving $$$

I will share this with the workshop maybe it will help thanks brother 🙏