AC green light flashing. No cooling

Hello all my name is George:
I have a 1994 3000GT SL
It has the following issue: My AC starts and most of the days works fine, but all of a sudden and randomly the Green light starts flashing on the ac button and the cool air stops. If l shut off the AC and turn it back on it works for a bit and then stops cooling with the green light flashing again.

Any ideas please.?

Have checked the belt deflection which seems fine . (the car has 46000 miles and is with the same belt)

Thanks for your help

Screenshot from my service Manuel. Hope this helps.

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