I bought my 13' max over the winter and now that it is getting warmer I naturally wanted to use the air conditioner only to find out it just blows outside temp air. I have a u1000 code for heater and air conditioning and I'm wondering what CAN-bus module would control the air conditioning. The heater still works fine.

 

Sounds like your A/C compressor is toast. Mine had the same issue a couple years back, I replaced my compressor and the A/C has been working flawlessly since!

 

I just told somebody else here... It's worth trying to replace the compressor clutch before the entire compressor if money is a deciding factor in what you do. I got a 3 jaw puller from Harbor Freight that took the pulley off for me and the replacement clutch was 20 dollars on Ebay. Lasted me two years before the compressor ultimately failed and need to be replaced.