Is the limited Climate Control plug and play for regular climate control

Temperature Control Without Crew Cab Limited Fits 07 TUNDRA 159908 | eBay

Looking into upgrading the climate control: Is this a direct plug and play, i dont have the heated seats, but can I just put in the blanks from my current climate control.

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No. Tons of work not worth it. I had an SR5 I did it to. Now I have a limited. Never use auto

 

2016 but basically the same thing as your 2013

Auto Climate Control Retrofit - 2016 SR5 | Toyota Tundra Forum (tundras.com)

 

The 2013 is probably the last year of the dual zone hvac box even with manual controls. If he has the ability to set a temp for driver and a separate temp for passenger it has the dual zone box with the split blend door.

To upgrade to the digital auto panel you need to swap the AC amplifier (ecu for AC), swap the control panel, swap the servo control wiring harness, add in a servo to keep DTCs out of the AC amp, and add in the interior temp sensor.

Its quite a bit of work and the cost adds up quickly.