my mate had a similar problem with his hilux, i just drained it and put some fresh fluid in it, then bled it out. His fluid in the reservoir was really clean but the stuff down in the box was milky/grimey

fixed it a treat.

I agree, & I have been told by some one that's allegedly smarter than me that Dex3 shit's once it's been to hot, get's to a temp then just die's.
Some thing like that, I wasn't listening..

the lines arent colapsing as they get hot are they??
my high pressure line has a fairly tight bend in the flexable section near the box and sometimes it sortof kinks a little and the box plays up.
I'll get a custom line made oneday when it shits me enough

Just take the pipe's off, once thay are off turn the wheel from side to side slowly, this will make a bit of a mess. Eng not running tho!!!
Then fill it back up & repeat if needed..

Spose you should put the hoses back on before filling it..

My complete system with a cooler only take's 1.25lt's, so it's a cheap fix if that's what it is, if it isn't you have ruled out one potability..

I guess its posible the valve in the pump that sets the pressure could stick open and drop the pressure as well, pull the screen out of the reservoir and look for any grit

I have a great way to change the fluid, but stekkys is probably cleaner

I guess its posible the valve in the pump that sets the pressure could stick open and drop the pressure as well, pull the screen out of the reservoir and look for any grit

I have a great way to change the fluid, but stekkys is probably cleaner :)

system was designed for dexIII I cant see why you wouldnt use it

fit a cooler and worry about other things in life, like why people still drive sierras

did you notice any heavy spots in the steering or any groaning from the pump?

normally it will expand enough to blow out the lid and make a great mess when it gets hot, but yeah 40000km and it should be changed

I'm with royce on the dex3, in most case's it will never get to the death temp, the oil in yours has probably never been changed..

It has been losing fluid thru the lid for some time,
so needing new fluid is looking to be a good bet.

does it look like it leaks above the seal, like through the spring loaded bit in teh top of the cap? mine does that

i filled my steering box (not power steer) with lithium grease (high temp bearing grease) - its like clag compared to the standard diff oil you're supposed to use, but it worked a treat for me, and being thick its less likely to 'disappear' =)