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DCT flush procedure

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Old May 16, 2025 | 11:05 PM
  #121  
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Default SCREEN Photos

Originally Posted by rlhammon
Can you post up a picture showing what software version you have on the NT710?

I was one who had the unit fail previously (2021 MY). I'd be happy to purchase the unit again, update it, and test it because the function simply wasn't in the menu item last time.
Here's a couple photos of the Foxwell NT710 screen - FYI
This is the NT 710 software version, etc. that was used to perform the System Hydraulic Flush on my 2020 Corvette C8 Z51.
This is the NT 710 software version, etc. that was used to perform the Hydraulic System Flush on my 2020 Corvette C8 Z51 - DCT
These are the auto manufacturers available for use on my Foxwell NT710.  I selected the GM option.
These are the auto manufacturers available for use on my Foxwell NT710. I selected the GM option.
The scanner has a number of screens that will show up & are displayed when connected to an OBD port. It can automatically determine your car's VIN number and then proceeds to offer appropriate screens to perform selected services for your specific car model.
Since I'm already done & finished with the DCT service I'll have to remember to take those screen photos next time.... maybe!

Select the transmission module (#2) and access services presented.
Select the transmission control module (#2) and access services presented for the DCT. Unfortunately, the leak test was one that didn't work on my 2020 C8.
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Old May 23, 2025 | 08:24 PM
  #122  
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I verified today the Foxwell NT7100 works with my 2022 Z51 HTC. I ran the flush test successfully after the oil temp got up to 170 deg.

I ran the leak test prior and it worked but after running the flush it wouldn't work. I wonder if it is because the oil needs to be cool?

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Old May 23, 2025 | 08:52 PM
  #123  
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From: Krypton
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Both of you guys that did the DCT flush with the NT710.....would you mind describing the flush procedure......exactly what you did and how long it took? Thx!
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Old May 23, 2025 | 08:58 PM
  #124  
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Originally Posted by gsvette
Both of you guys that did the DCT flush with the NT710.....would you mind describing the flush procedure......exactly what you did and how long it took? Thx!
I have a video but it's to large to upload.

I had to wait until the oil temp got to 170 then ran the Hudrolic system flush procedure holding the brake down.

RPMs went up to 2000 for 10 minutes and then said complete.
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Old May 23, 2025 | 09:01 PM
  #125  
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Originally Posted by gsvette
Both of you guys that did the DCT flush with the NT710.....would you mind describing the flush procedure......exactly what you did and how long it took? Thx!

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Old May 23, 2025 | 09:27 PM
  #126  
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From: Krypton
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That is the correct flush procedure. That it works on MY2022 and earlier C8's is puzzling. I need to do some research on Foxwell and understand how they are somehow running GM CAN-FD processes in a third party tool.
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Old May 24, 2025 | 12:23 AM
  #127  
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I'm 99% sure the leak test has ro be done with the fluid cool or at least below 170 deg because it says After the fluid change.

I also did the leak test before I tried to do the fluid flush when it was around 150 and I didn't get any errors. it appears to work

Last edited by lovbyts; May 24, 2025 at 01:23 AM.
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Old May 24, 2025 | 03:40 AM
  #128  
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Default Good Point

Originally Posted by lovbyts
I'm 99% sure the leak test has ro be done with the fluid cool or at least below 170 deg because it says After the fluid change.

I also did the leak test before I tried to do the fluid flush when it was around 150 and I didn't get any errors. it appears to work
You make a good point about doing the leak test after the oil cools down.
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Old May 24, 2025 | 08:31 AM
  #129  
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Default Leak test says "warm"

Originally Posted by lovbyts
I'm 99% sure the leak test has ro be done with the fluid cool or at least below 170 deg because it says After the fluid change.

I also did the leak test before I tried to do the fluid flush when it was around 150 and I didn't get any errors. it appears to work
Originally Posted by Jacques Albrecht
You make a good point about doing the leak test after the oil cools down.
The procedures for the Hydraulic System Leak Test that I have seen posted on this forum call for the fluid to be warmer than 122 deg F. I have attached an example.

The temperature requirements during the DCT external canister filter change would seem to "drag out" the process - if followed to the letter.

Step 1 of the filter change procedure calls for the Hydraulic System Flush - which want warm fluid - warmer than 122 deg F. After the filter is replaced, the next step is the Transmission Fluid Level and Condition Check, which wants the fluid at room temperature (between 68 deg and 104 deg F). So if one follows that, there will be a waiting time wile the fluid cools. After the level is checked and adjusted, then it calls for the Hydraulic System Leak test. This calls for the temperature to be warmer than 122 deg F, in the written procedures I have seen posted.

Just sayin' what it says - not disagreeing with any actual reported experience.

The first clip is the tail end of the filter change procedure, showing the order of the Level Check, followed by the Hydraulic System Leak Test. The second clip was capture from a post on this forum that included the procdure.















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Old May 24, 2025 | 02:29 PM
  #130  
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Default

Originally Posted by lovbyts
I have a video but it's to large to upload.

I had to wait until the oil temp got to 170 then ran the Hudrolic system flush procedure holding the brake down.

RPMs went up to 2000 for 10 minutes and then said complete.
Upload it to YouTube and post the link here.
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