A/C Problem - Trying to diagnose problem

[tunetec]

I have a 2005 C2S and when I got in the car the other day the climate control wasn't working properly. Turned settings to low and although the fans started up no cold air so checked a few things and decided best thing was to get regassed as Compressor seemed to be working ok.

Had the gas topped up slightly and had cold air again but only for 2 days. However, climate on low temp settings is now making a whining/hissing noise from under the dash, passenger side n/s UK car.

It is like a sucking hissing noise of varying pitches and now increases at higher revs. The low temp is very slightly cold so i'm presuming not entirely out of gas.

Question is do you think there is leak or another problem from under the dash where the air con internals are?

One thing i have noticed for a long time prior to this happening is a ticking/clicking noise coming from the same area under the dash, almost like the sound of a flap or valve constantly opening and closing.

Should I have the gas emptied and refilled from scratch with some dye and new oils to see if this will overcome the problem. I guess if the gas is going low i have a another problem somewhere else.

[JFP in PA]

If you have a leak in the AC unit under the dash, any decent AC shop should be able to detect the gas (most now use electronic detectors that are very sensitive). If it is leaking, the under dash unit must be replaced..............