Polly wrote:I'm with Alex on this one, since a fan must first suck in air before it can then blow it out at the other side, it will be irrelevant which side of the radiator it is mounted.
I agree, unless you are fitting the fan to a car that has a shroud to funnel the air past the fan. In that case obviously a funnel won't funnel backwards.
I have a Mark 1 with the fan in front of the radiator. I did have to make a small cut-out slice from the cross-panel under the radiator, to clear the fan surround. Probably that would have been unnecessary with a slightly smaller fan.
I haven't noticed any loss of efficiency from that position, it easily maintains the correct temperature, only ever cutting in in slow traffic or a very hot day climbing a hill.
I agree a relay is a good idea to isolate the warning light. On another vehicle the light used to glow so brightly it was pointless as an indicator that the fan had cut in.