JohnnyQuattros

When I turn the steering wheel (Car at idle and not rolling) I hear a humm sound with a beat at about 3 cycles per second. "rroww-rroww-rroww-rroww..."It's not loud and I can feel it in the steering wheel. It seems to be worse steering from full right stop to full left stop than left to right. I had a new steering rack installed at the dealer ~ 6 months ago. Last week I demonstrated the noise to the service tech and dropped off the car. They determined that it was the power steering pump and replaced it. When I picked up the car, it was fine. Then I noticed when I turned the ECON mode off (AC on) the symptoms returned. The noise is only present if the ECON mode is off.

What do you guys think would cause this ?

MikTip

Then verify its the correct oil, and is "clean", and doesnt smell burnt.

If in doubt, flush the old oil out, with new oil.

JohnnyQuattros

it's full - that's what the tech thought initially as well

MikTip

I've found engine oil in there before....

JohnnyQuattros

steering pump was installed.

JohnnyQuattros

I removed ~3 ounces. Now it's at the max line

MikTip

What color is the oil?

MikTip

You did not mention if the car was fully warmed up, or cold, when the noise occured?

JohnnyQuattros

clear green with slight brown tint

JohnnyQuattros

warm or cold and only if econ mode is turned off