Vauxhall Zafira Fan Belt Problems

replaced the fan belt on the zafira but the turbo only works in fourth and fifth gear and there is oil leaking underneath the engine

squeak and slight whine coming from near fan belt, belt is newish and defo not slipping, what does belt drive exactly and could it be something about to fail ie water pump alternator etc, whats best way to tell thanks

hi i got a disel when i put foot down there is no power it takes ages to get up to speed its not in limp mode no lights are on do u think it could be a injecter or egr valve needs a clean thanks for looking

when cold drives in all gears but as soon as it gets warm i have know gears at all