Kilma Switch

[dylant]

I am eliminating problems one by one to fix my AC on a w124 88 and I came across the kilma relay lately, I removed it to have a quick look and the merc mac told me it was the wrong one, it says "4 Zyl" he said it was for a 4 cylinder and mine is a 6, the female connector(on the car) was different to the male connector(on the kilma). Doesn't this seem wrong, it does to me, does anyone have some information on which kilma I should have and could this be the reason why the AC will not work? It does come on sometimes but then cuts out!