jstluise

'90 4runner 3VZE

Lately, I noticed the PS fluid being low. I figure I have a leak, but couldn't see it anywhere. Today, I replaced my valve cover gaskets, and in the process I replaced the PS pump vacuum switch hoses (old ones were old and brittle). I removed the vacuum hoses and discovered PS fluid in one of the hoses (not the other). I'm guessing this isn't right...and it looks like I found the leak.

Is this an indication the PS pump is going out? There is also a squealing/squeaking coming from what seems like the PS pump, thought I didn't have any stethescope on hand to pinpoint the sound.

What do you think?

TNRabbit

It's the switching valve that idles the engine up when you hit the end of turning radius. not necessary. I blocked mine off & haven't noticed it missing in 4 years.

Also, it costs about $190 from from the dealer for that stupid valve.

If you have squealing, could be a belt.

jstluise

Thanks for the response.

I guess my main question was how fluid got into the vacuum hoses. Would it be the vacuum switch that is going bad (my guess), or is it something with the PS pump itself?

I'll consider removing the switch and plugging it, as long as I know the switch is at fault and nothing is going wrong with the pump (still have to look into the sound I hear).

As for the sound, I'll investigate further. Doesn't sound like the normal chirp/squeal of a belt.

HappyAdventure

That vacuum switch fails and lets PS fluid through. I removed and plugged mine as well. Just go to the hardware store and get a bolt to cut to length, wrap it in teflon tape and crank it in. The teflon tape is important because there is not a flat mating surface on the pump body for a gasket.

I would remove the switch before replacing the pump. You will have to replace/ remove the switch even if you get a new pump.

DeathCougar

iTrader: (23)

The vacuum switching valve starts leaking, which in turn allows the fluid into the lines.

Replace/Plug the VSV and you will be good to go.