AC doesn't work , dash controller blinking
 

Hi everyone , just replaced my heater core . I have some pictures if anyone is interested . But now when I start it , dash controller (for heater control) blinks 65 times with whichever lamp is in use , meaning , there are small green lamps for auto , blowing in your face , on your legs , on windshield and so on .
And I don't get any air conditioned air , it is cool but it is not ac cold like it supposed to be .
Vette is 91 L98 . Please help with any inputs :)