I've been having this issue on and off and now its getting a bit annoying. Sometimes I start up the car and the AC is on OFF, it blasts on AUTO. Or when I drive, the AC kicks on randomly...could this be the switch or the ac module unit itself?

 

That explains why section ATC of the service manual says 'Automatic Air Conditioning". It comes on by itself.

 

I would think the switch is going south on you, are you having other electrical problems???

 

I had the same problem... Check and make sure the ribbon cable is not damaged...

 

 

Carbon build-up on the thermoresistor.

 

Is there a free download on the FSM? phatg20's website doesn't work anymore.

i figure it was the switch or ac module...no electrial problems.

its not damaged.

where is that located?

thanks all!

 

Try this thread:
https://my350z.com/forum/maintenance...anual-fsm.html

http://www.nicoclub.com/FSM/350Z/

 

hmm...for some reason that link from nicoclub wont open for me

 

Try this:
http://www.nicoclub.com/FSM/350Z/coupe/2004.5/

or this:
http://www.nicoclub.com/FSM/350Z/coupe/2004.5/atc.pdf