Yet another A/C problem/question thread

[WeeYari]

After reading as many threads as I can, I'm still unsure of how to diagnose a no cold air issue.

What I am seeing and experiencing;

- no cold air at all, not even briefly
- no typical drop in RPM when a/c engaged via climate control button
- no bubbles visible in sight glass

What I have done;

- check all fuses and they are good
- briefly depressed low pressure line valve and pressure was released
- cleaned pressure switch connector

When I depressed the line valve, bubbles did appear in the sight glass. These went away once engine was restarted. No subsequent bubbling appeared.

It should be noted that I do not currently have access to pressure gauges or a multi-meter, so I cannot perform any diagnosis that involves those items.

Finally, a rookie question. Visually, how can I tell if the compressor clutch is engaging since the pulley is always spinning? I'm guessing that if the disc located on the left side of the a/c pulley is spinning, then the clutch is engaged. If that is the case, then my clutch is always engaged.

Thanks in advance for whatever insight can come my way.