The filter inside the power steering reservoir is probably blocked. Look at the reservoir, it is probably wet around the outside and the fluid will be foaming when on tickover. Quite common on Mondeos.


If so, drain the reservoir and remove. Either clean the filter inside it or replace it, I changed mine recently, think it was £18 for a brand new one, plus a litre of fluid to top it up again.


Look at page 5 of my thread, you will see what I mean. https://passionford.com/forum/restor...-on-20s-5.html