If the system is low on refrigerat (it is r134a in this case) and the compressor does not engage, wil we still see the bubbles on the sight glass? Im not too worried about servicing it myself, but I dont know if its legal in canada to do so.
I'm not sure if the 93's have the 134a system. My 94 has it and makes some
> friggin' cold air.
> No, missing a shrader valve dust cover will not allow leakage of the
> refrigerant. Your system may just be low on the refrigerant and if it is,
> the compressor will not engage due to the low pressure cut-off switch not
> sensing enough pressure on the return side. With too low a pressure on the
> return side, the compressor will not receive adequate lubricating oil that
> is carried by the refrigerant (R12 or R134a). You can do a visual check to
> see if your refrigerant is low by looking into the little sight glass on the
> receiver that is located low next to the radiator on the driver side. Turn
> on the system and take a look. If you see bubbles or foam passing through
> the sight glass, and then the compressor cuts out, you know you are low on
> refrigerant. If you don't know how to service an auto a/c system, you
> should have it serviced at your local shop.
>
> Chris
> 90 & 94 GXE's
>
> > The a/c on my 1993 maxima gxe does not seem to cool at all and I > think(hope)
> > it might be the freon. There is a small valve/opening near the compressor
> > that I thnk is the pressure relief valve. It looks like it has a small
> > needel coming out of it. It also looks like it should have a cover, but > none
> > is present. Could it have leaked out from there if the cover is missing.
> > Also, is there an easy way to check if the compressor is working? I have
> > read that if the freon has fallen below a certain level, the compressor > > shuts off.
> > I played around with the self diagnostics on the digital climate control,
> > but would there be any other tests that could be run without draining the
> > freon?
> > Thanks
> >
> >
>
>