2001 Ody. A/C intermittently stops working?

I have an '01 Odyssey that intermittently stops blowing cold air then for no apparent reason starts blowing cold again?? Anyone have a similar issue with this generation Odyssey??

I have owned a 2002 since new. A/C has always run great. It has run great this spring then suddenly only warm air no cold. If I set the climate control at 32 degrees it comes out hot. If I set it to 18 degrees it feels like outside air only even when I've selected A/C on. I hear the clutch clicking on and off when I select and deselect A/C. The belts seem okay. This happened suddenly not over a period of time so I don't think it is the coolant.
Any ideas??