I have a 2000 Buick Park Avenue Ultra in which the power steering works perfectly fine in the first 10 to 15 minutes of driving but on dry days, after which time, it gets harder to turn the wheel at very slow speeds, especially when parking. It also gets a little whinier sounding when turning. Also, when it starts getting like this, I can sometimes get a sound like the wheel is scraping something when I make a right hand turn.
I took it to a place that specializes in power steering and the mechanic, who drove the car and heard this noise, thinks the power steering and the rack-and-pinion is ok. He took a little of the power steering fluid out and put in an additive. The power steering seemed to be working great and the wheel noise was gone but the weather has gotten mild and dry lately and now it's back again, after driving awhile, of course.
I've been doing some reading on google and I'm wondering if it could be the power steering speed control valve getting stuck. But if it is that, why would I get the noise from turning right, unless that is unrelated.
This time I'm going to take it to a GM dealer but it would be nice if I could find any info here, so they don't try and rip me off and say it needs new power steering...Assuming they would be the type to do this.
Thanks,
Jeff