hi ya all,
does anyone know how to test to see if the fan cuts in when its meant to, vhanged waterpump the other day and middle hose, (someone had bodged an o-ring in there three times to big, 60 quid from stealers fro a 50p rubber bit) filled up with apropriate coolant water 50/50 mix, no leaks running fine, but still cant this fan to kick in, fan cuts in with a/c unit on but not so far watertemp only, tried to find other related posts to this but on-one so far has had this prob on an n42, trying to get inpa working on an xp lappy later, so will have a look at the watertemp, now would the rad outlet sensor measure and send its findings to the ecu to cut the fan in, or would that send a message to the thermostat to open that? most confused any help would be needed, just if its only a little bit of extra knowledge.

cheers chaps...