Makes a noise (moaning-like)when turning the steering wheel but goes away after car has been driven for a while.

Power steering fluid is low. check and top it up or you risk damaging the pump.

after topping up to the full mark, turn the steering lock-to-lock several times to purge any air from the system then refit the lid. Take care not to get any dirt into the open pump and only use the correct steering fluid for your car or you may find the seals rot and leak, a steering rack for your car is over £600 plus a LOT of labour believe me.