2003 G35 Coupe 6 m/t 76k miles

My air conditioning comes on randomly sometimes and it just does its thing. The whole dash (radio + climate controls) become useless as the a/c comes on full blast and none of the controls work. It happens and goes away (sometimes it is quick, others its stays on for a while). I suspect it is the circuit board as I see other people have a similar problem. The steering wheel controls still work for the radio but all else does not. Here I attached some photos of what my dash looks like when it happens. Anyone know where I can find a good DIY or decent one on how to replace it? I just need an idea and any tips if anyone has some experience. Thanks guys.

 

Thing your controller is fried. Common issue on these. Just search ac always on full blast.

 

yeah I suspect that is the issue. cant find a diy for the circuit board replacement, trying to see if i can find one before i give it a go

 

Yes mine started doing that too when it got colder outside and i'm in a middle of selling the car and cannot find a cheap replacement