94 E320 coupe _ Click/tick in engine bay

[cornershop]

So i picked up the above car on Monday, and have noticed a repeating tick or click from the engine bay, either from or below the pas fluid reservoir.

I noticed when in the car at night, the clicking appears to dim the backlighting on the ac control, so assuming ac related?

Any thoughts please?

https://vimeo.com/165360473

 

[carat 3.6]

Disconnect the wiring to the a/c pulley clutch, sounds like it's engaging then dropping back.

 

[cornershop]

Thanks - Is that the item below the PAS fluid reservoir?

 

[carat 3.6]

Yep, below the power steering pump.

 

[cornershop]

Difficult to see where the power attaches without getting the car on axle stands. Does the fact that the compressor is clicking remove the Klima / kick down relay from the equation ? The relay I have fitted is the NLA 0035454905 part number, which I think is correct for cars with diavia aircon?