dez58pop

am i right in thinking when i first fire the car up with a&b grounged engine light flashes fast ,this means its in open loop ,then slows down when gets up to temp then goes into closed loop ,just im waiting to get a rad orderd so ive never had it up to temp yet to read any codes if any ,(touch wood there isnt) and also i can only do the timing and reset the iac when the car is up to temp in closed loop ,or is the other way round ?,how slow will the light flash to let me know its in closed loop ,thanks