Power steering fluid change?

Remove and extend return/reservoir hose ... idling engine, drain into bucket till runs clear.

I SAY AGAIN, the Lucas PS additive works great - IF YOU HAVE A LEAK IN YOUR RACK, IT MIGHT SAVE YOU BIG BUCKS! -

IF YOU DONT HAVE A LEAK..dont use it!!!!!!

If you just change the fluid in the reservoir, will this new fluid circulate through the whole system [like the rad cooling system], or just sit in the resevoir like brake fluid? thanks

well, in the first place brake fluid doesnt 'just sit there' though it's a single ended system.. and can only be flushed thru bleeders.

but no, it recirculates as the rack or box operates... which is why there's a 'return' hose

The fluid in the PS reservoir does mix with the fluid in the system but there's not much point in changing just the fluid in the reservoir. It represents a relatively small amount of the total PS fluid.