air conditioning fans

[Alan]

Had cam belt traumas with Delta HPE HF last year eventually all repaired and sorted, in fact going like a rocket now, however having disturbed many things under the bonnet whilst having the head etc off the air conditioning seems to switch the radiator fans on rather too often and for too long (although they do seem to switch off when the car is on the open road above 30mph/50kmh). Anybody out there have any ideas on loose connections or whatever that could cause this? It also sometimes opens the auxilary air valve too much from a cold start and doesn't want to let it shut only doing so if the economy button is pressed, usually happens when the weather is not too hot or cold.