Hi all, my a\c doesn't work :( Ive checked the relay, the fuse and the clutch on the compressor. I also made sure "econ" is off ;)

 

Any ideas?

 

Its on a UK spec car if that makes any difference?

 

thsnks in advance

When you say it doesnt work do you mean you can't here the compressor clicking in? Its possibly seized.

no ive checked the compressor and its fine. The clutch on the front doesn't engage but i have tested the clutch by sending 12v to it and it works fine.

no ive checked the compressor and its fine. The clutch on the front doesn't engage but i have tested the clutch by sending 12v to it and it works fine.

 

it will only engage when the system is presurised..so if you need refrigerent it wont click in

Oh really? Ok i suppose i can test that by sending 12v to the compressor when the engines running and see if i get any cold air. I'll give that a go and let you all know.

 

If there's a pressure sensor, do you know where it is?

 

thanks for your help so far people

If you don't have refrigerant in, you won't get cold air out.

Hi all, my a\c doesn't work :( Ive checked the relay, the fuse and the clutch on the compressor. I also made sure "econ" is off ;)

 

Any ideas?

 

Its on a UK spec car if that makes any difference?

 

thsnks in advance

 

This may sound really silly, but you say you've made sure econ is off?

To check the operation the air con, set the temp to 10 and press auto, then alter fan speed and air direction to suit (if you can).

Ignore me if you know this already, just making sure its not something really silly!

Pressing the econ button turns the air con off, pressing auto allows it to come on if the temp is set low enough.

The AC system has a lock out when the pressure is below about 30psi. Its there to stop you wrecking the compressor by running it with a dry system with no lubricant or refridgerant left. The lubricant oil is mixed with the refridgerant. If there is enough pressure to make it work it can still work badly if the levels are low. You can tell a lot by seeing bubbles in the little sight glass when its operating. Ideally you should see fluid flow and minimum bubbles. Also a good condition system will have the pipe to the condenser very hot and the one coming back from the comressor very cold. The section in the manual on the AC system is huge 168 pages. It also has diagnostics.

 

http://www.300zx-twinturbo.com/cgi-bin/manual.cgi?list=ha&dir=&config=&refresh=&direction=forward&scale=0&cycle=off&slide=112&design=default&total=168

 

You probably need it recharged with drop in replacement if R12 or E134A if your is a later converted system.

Yep, you guys are right. There's no gas left in it. Thanks chaps