TommyBoy72

Sounds like you guys are describing the air ride compressor venting. Its located near the passenger front wheel well.

My 91 LS is pretty new to me and I just replaced the PS pump...two days later the alternator died and I replaced that as well. Now the car is running great but I am going to go back and replace the two main hoses (hi pressure and return) in the near future just in case. My alternator was dry and looked fine, but yet died anyway. The reman'd PS pump was $117 from Autozone, the Alternator was $140 from Pepboys (or autozone). If you did them both at the same time, its about 4 hours of labor, maybe less if you are familiar with it, more if you are not. I also replaced the Air Control Valve (ACV) for $78 from irontoad.com while I was in there as I had the startup smoke problem, you can easily replace that anytime and will not disable the car when it fails. HTH.

I am using Valvoline high mileage ATF. ATF seems to be the most common recommendation I have read online.

irontoad.com Just replaced mine after I got the part from them. Way cheaper than anyone else ($78 and change).