AC issues

[SURTEESS]

I have a 95 - the AC started playing up yesterday - random beeping, temperature returning to min (even though I try and reset to "normal" temp).

The display is the later model type with 2 rows of 4 switches seperated by a small display (also has the circular up down temp switch).

Any way went searching through previous AC issues - found out how to run the diagnostics, but could not find anything about error code 13.

Any thoughts on this matter would be great, as it is winter in NZ & is becomes a bit pointless trying to take the car out when the windows are fogged up.

Thanks

Steve in New Zealand