Power steering boiling up

[Russ Ward]

I have a Defender 90 that when off roading the power steering boils up and I get power steering when I turn right but not when I turn left. I have fitted a recon power steering box and the fluid is new. the only thing I have not changed is the pump but then I figure that if it boils then it must be pumping!
This cools back down and things turn to normal

[Axetamer]

Mine does the same, have changed fluid but just the same, it's working much harder at lower speeds offroading and has no oil cooler...it is a land rover after all..I just live with it........not so bad on the wetter sites

[ARMYBOB]

i had a simlialr problem with mine

driving to italy my fluid turned to pink foam and blew out teh breather all down the side of the car

then a pipe failed, i kept changing the fluid but it just went pink and foamy

anyway changed the pump, its a TD5 so the pump and water pump share the same drive, when i took the PAS pump off the water pump was all gooey and rusty and then i started leaking water, think water was seeping into the pas pump somehow, anyway both were changed and the problem solved

maybe someone with more knowledge can explain better?

[Range Rover Blues]

Sounds like they were both knackered.  The PAS system is under pressure but a good dunking might see it off.

I've been following another thread about modifying the PAS system and some guys run oil coolers (bog brush) and/or swap the fluid for hydraulic oil which stands more pressure without boiling or cavitating.  ATF isn't that special in the grand scheme of things.