CLK230 Air conditioning

[psen]

I have a 1998 CLK 230 Kompressor and have an issue with the air con. The blowers only work every now and again, for both the hot and cold air. It seems that when I drive over a bump it comes on temporarily. When I select/deselect the 'auto' button, a clicking noise which comes from the passenger side dash can be heard. The gas has recently been refilled, but made no difference. Cannot clear condensation from windows as the air doesn't come through any vent.

Any advice?

Thanks