When I turn on a/c button it blows cold but then starts flashing on and off

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. Since the flashing is occurring after the system seems to be working, it would appear that the system is initially functioning properly before something happening causing a problem with the air conditioning system's operation. This can be due too something electrical, like a clutch coil issue at the compressor, a cycle switch issue or something else. Hands on testing is needed to find out what's going on. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.