I recently replaced my climate controls (which where working perfectly) because of damage to one of the knobs. However, after replacing the unit i am only getting hot air blowing even with the temperature set to low and the air con on. Also the mode is stuck to face and wont switch between modes ie. foot well blower or windscreen blower etc. I tried another unit and still the same problem! Any advise would be greatly appreciated as its driving me nuts! Thanks, Gary