How to fix a clicking sound when turning on the air conditioning?

I recently noticed a clicking sound when I turned on the air conditioning in my Vauxhall Zafira Life. It seems to happen only on the driver's side and it gets faster as I increase the fan speed. What could be causing this and how can I fix it?

The most likely cause of this clicking sound is a faulty blend door actuator. This is a small motor that controls the direction of air flow in the HVAC system. It can become stuck or damaged, causing the clicking sound. You can try resetting the actuator by disconnecting the car battery for a few minutes and then reconnecting it. If that doesn't work, you may need to replace the actuator.

Another potential cause of the clicking sound could be a worn or damaged drive belt. This can cause the air conditioning compressor to make a clicking noise when it engages. Check the condition of your belt and replace it if necessary.

It is also possible that there is debris or leaves stuck in the HVAC system, causing the clicking sound. Try checking and cleaning the air intake and cabin air filter to see if that solves the issue.