it really is doing my head in lol

i brought it last week and 2days after i bought it the following happened

right, first of all the bottom rad pipe split, so i changed it, the same day i noticed the water pump had gone so i changed the pump and belt.

since then, the fan doesnt kick in so ive had to bridge it, there is a small damp patch it the bottom left of the rad (by the fan switch).

ive bled all the air out and added some bar weld to sort out the rad but the fan switch is still not workin.

theres no water in the oil, or no oil in the water, no leaks, no smoke, no nothing lol

any ideas on what it could be? the thermostat is still workin alright and hot air still blow's through the vents.

im seriously out of things to blame it on. anyone got any ideas on how to sort it?

thanks all

Mike