My power steering is quite light when I first start driving each morning but within an hour the steering starts to feel heavy, more noticeable when driving slow or stationary, it doesn't use or leak any fluid, any ideas what could be wrong. ??

 

how's the fluid level? Have you taken a look at the PAS belt? Is it making any noises on partial/full lock?

 

Had new belts about 1k miles ago fitted at Subaru garage, fluid level is perfect and no noises from belt/pump/rack everything is spot on it just gets heavier after its been run for a short time, even after its run for 5 miles then stopped for an hour then drive again and its always heavier than when I first start and drive it on a morning.

 

I had an issue when changing to a new belt as tension was better. My fix was a flush of old fluid and replace it all. Sorted it out for me.