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Never seen that before
chrism - 24/7/13 at 07:50 PM

I was stripping a Toyota Camry V6 down today to remove the engine and noticed that the cooling fan on the back of the radiator was powered hydraulically by the power steering pump, has anyone ever seen this before as its a new one on me.

Volvorsport - 24/7/13 at 08:02 PM

all buses have them , control with an ecu which varies the speed of the fan with engine temperature....

snapper - 24/7/13 at 08:36 PM

Interesting as the pump is driven all the time and only carries load when turning at low speed, a fan with good bearings would not take a lot of power to drive

MikeRJ - 24/7/13 at 09:31 PM

quote:
Originally posted by snapper
Interesting as the pump is driven all the time and only carries load when turning at low speed, a fan with good bearings would not take a lot of power to drive


I think you'd be surprised just how much power a fan can take. The bearings are pretty much irrelevant (unless virtually seized), it's the amount of air it's pushing that requires the power. A directly engine driven fan (i.e. no viscous coupling) could easily be taking 4 bhp or so at high RPM, and much more in some cases.

[Edited on 24/7/13 by MikeRJ]

luke2152 - 25/7/13 at 07:56 AM

A lot of plant vehicles have this set up with a solanoid to switch the flow to the hydraulic motor on and off. I also have seen this set up on a toyota cressida