For those that read my thread re the above after nearly 3 months I have finally fixed the engine fan problem. Let me recap, after I changed the coolant, for some reason the engine fan stopped working, now I don't know how this problem arose, but the GREY connector, which is inside a protective covering and was NOT touched in any way, but the GREY connector was not making contact inside the plug, luckily I had another plug and rewired it in place pf the faulty plug and IT WORKED. I still cannot figure out how it happened. Hope it might help someone how suffers the same problem.