So recently my Volvo 240 my steering wheel starting making a noise when turning. But it doesn't sound from the engine just right behind the steering wheel. But this seemed to happen overnight. My car has sat (my dad turned on whilst I was gone) but have been on vaca for two weeks and live in the south. So I'm thinking making humidity??? It's been real hot here and don't drive my
Car long distance. Plus it's never made a noise up until recently.

Any ideas? My Volvo only had 71k miles so I hope it's nothing more then parts expanding due to heat.

 

It's probably the power steering whining. Could use a top up of fluid.