Power Steering Fluid questions.....

Joined
Jun 8, 2006
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5,446
Location
KC
Does PSF flow through the system like oil does or does it just fill up tubes and hoses and distribute pressure like brake fluid? I was wanting to extract PSF from the reservoir and top it back off with fresh fluid but I wasn't sure if this new fluid would actually be making its way through the power steering system. Can anyone clarify for me?
 
Joined
Sep 5, 2006
Messages
19,479
Location
Chicago Area
Neither is exactly correct, as stated. But it is closer to a flow through type. If you 'turkey baster' the reservoir empty you can fill it and it will mix very quickly with the remaining fluid. Do this a number of times and you will have a virtual flush with new clean fluid.
 
Joined
Dec 5, 2003
Messages
6,990
Location
Everett, Washington
It will flow through the system and mix. I always try to disconnect the return hose and flush out the fluid. I just worked on a car that is a pain to take the hoses off. So I am just doing replacement of the reservoir fluid a bunch of times. I will then replace it with syn fluid at some point. It's the next best thing to flushing.
 
Joined
Mar 21, 2004
Messages
26,377
Location
Upstate NY
The PS unit is your basic hydraulic unit with a pump (high and low pressure lines) a cylinder and a valve mechanism (steering wheel) and a reservoir. Most reservoirs and two hoses going in. If you extract all fluid from the reservoir and refill then drive for a few minutes turning wheel fully side to side, then repeat maybe 3 times you will have almost all new fluid.
 
Joined
Jun 3, 2002
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8,259
Location
MI
My Caravan appears to only have one hose going to the reservoir. How does this fluid circulate?
 
Joined
May 10, 2005
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2,478
Location
Toronto, Canada
Not familiar with Caravan reservoirs but you might possibly have a remote rservoir. The high pressure line will come out from the PS pump. Fliud flows out thru the high pressure line, goes thru the steering rack and comes back thru the low pressure line to the pump.
 

Kestas

Staff member
Joined
Jun 4, 2002
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14,044
Location
The Motor City
It's probably just an accumulator, like an overflow reservoir. Conventional pumps have the reservoir built in with the pump.
 
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