G’day all , 2003 4.4 Vogue . any advice would be very much appreciated , So after replacing my Hevac unit /Aircon Heater dash unit ( had been told it was a power drain ) Easy yes ,,, NO !! Swapped units within 5 minutes no probs, but now all I have is HEAT ( Aircon was very cold prier )and I mean really hot and I am in Australia, Aircon on or off no difference , change temp on dash no difference ( .Swapped back to the old unit same things persist ,,, Any ideas people . PLEASE