power steering

[leo2]

hi can any one tell me where my power steering switch is I've spent all morning looking and can not find it im thinking it as been cut out
car failed mot on it not working but had passed the last 5 years even know it didn't work

[iantt]

you mean power steering pressure switch? dont think the diesel has one. whats your problem?

[leo2]

thanks I could not find it any where spent all day looking for something that's not there had half the car apart
the problem is it doesn't work when parking ect I have changed the fluid as it was black  new oil seems to have improved a little 
have air bubbles in the reservoir  it say about using a vacuum pump  to bleed the system in the Haynes manual is this a job for the garage