Hi..first and foremost a big thank you for this post - my zafira heater had been clicking for a while when turned on the heat setting - a week ago it started making a different kind of noise when it was turned on cool - the noise was painful plus the heating was gone..Followed these instructions and got the heating back in an instant - the only headache was removing the three little screws that hold the valve cover but otherwise absolutely easy..many thanks once again, regards, christian