My climate control does not work in cold mode and pumbs out hot air. I'm thinking that the valve that controls the water has jammed or broke. Any ideas where it's located?

It may be that the system needs re-gassing?

 

And here is a link for online service manual.

http://300zx.co.uk/cgi-bin/manual.cgi

Tried the regassing but it's not that

 

Cheers for tha manual link

There is a manual for the aircon - its huge - but you can get the aircon into diagnostic mode and it should tell you what is wrong. Maybe you should try that

 

I take it the obvious like the compressor is running etc and the aircon condenser in front of the water radiator is getting hot when aircon is on auto? You can also see the fluid flowing in the sight glass round by the battery

I'll give it a try

 

everything is working proberly i set the temp at 10-20 degrees but all i get is hot air