Air Con Leak

[portaz]

Hi guys,

Had my Aircon regassed and all was fine (thought it was too easy for a Gtr) anyway got home and heard a hissing sound and thought it was coolant boiling in turbos . Fast forward 2 weeks went for a drive and air con clutch won't engage. Went back to carbon to look for leaks which we couldn't find so I changed the compressor o rings . We started to add some gas and I heard the hissing again. Dave said to take it home and add air from compressor to find leak which I did. Anyway after about 45 minutes I found the leak was from rear of compressor where the wire comes out there is a brass screw with a tiny hole in it. I checked in my spare compressor and it's the same. Under the screw there is a spring and a seat, anyone know what this is? Clearly it shouldn't leak normally but it must be there for a reason. Can't find it on google, I'm thinking if pulling the rear plate off the old one to see what it is but my feeling is it's an over pressure valve or and bleed hole if something fails? On vw's with zexel compressors they change some sought of valve as part if conversion to 134a could this be needed on Gtr?

Scott

[niZmO_Man]

Totally off topic, but the Indian dude at the shop (where you initially parked) was me LOL. I was getting the air con regassed on my car (I didn't know Carbon did regassing). The compressor on my car doesn't engage, so have to find the electrical fault.

Maybe replace the compressor again? fatz has a couple lying around...

[portaz]

I was going to say hello but wasn't sure u were the owner . It seems its a over pressure valve , maybe we put too much gas in? I didn't give it a squirt to 7k when it started leaking , how much gas did they put in yours? Did they feed just high pressure or low on the firewall as well?

[portaz]

Also there is a self diagnosis check that can be done to check your sensors etc in the service manual maybe that can help u fix yours

[GTR-N1]

Good to know.

[portaz]

No one seen this leak before ? Or heard if a fix ?

[StevenCJR31]

Ive not heard of a fix before, I think most guys on here dont worry too much bout the aircon on their skylines

[portaz]

I guess that may be the case but I need it for my daughter in the back seat

[niZmO_Man]

No idea on how much gas, the machine does it automatically I believe. Cheers for the aircon diag, I remember reading it in the manual, will do it once I get some time. Does your other compressor have that brass screw thing?

[portaz]

Yep it's an over pressure/temp discharge port but basically means pressure sensor wasn't working to disengage clutch , but also could be indicator of blockage or Thermo fan not working . I will change receiver drier this time too . This discharge thing should relesse some pressure then close which unfortunately it's not doing . They tell machine what to put in, r32 Gtr is 550gms as a good starting point with r12 problem is 134a has different expansion rates so who knows with that?

[jiffo]

Still not enough IMO.

[portaz]

Do u know if they filled through hi and low port or just high?

[jiffo]

Low.