The car is quieter in warmer times than colder times but still quieter
overall.  I'm sure you can hear the engine more now that the climate has
turned cold. I sometimes hear what sounds like a mechanical soft sounding
whine (as if a door was closing under the hood) and just chaulk it up to the
computer adjusting some sort of linkage. The only time I hear what you
describe as a pump sound is when I've started the car and threw in into gear
way too fast.  There's a slight shuddering and then again when I stop. It
may have something to do with the computer thinking the engine didn't fire
correctly at start up.
It could be something normal but hard to explain so they just tell you it's
OK, it's normal. Don't lose any sleep over it. You're covered :)
I'm having a slight problem with the front driver side tire "singing" at
high speed since having a rotation. The front end is pulling to the left a
bit and the mechanic said it's called bias pull, from not rotating the tires
soon enough. According to their records, yeah, it's been awhile but in fact
they have been rotated but by my other mechanic. Supposedly it'll work
itself out. They offered to swop the left and right front tires. Up to now
the car tracked in my opinion perfectly.

mark_

Thanks for the heads up.  I guess the noise that I hear is almost every
time I take my foot off the brake peddle.  It almost sounds like if there
was an electric pump kicking in to pressurize something.

Thanks for the heads up.  I guess the noise that I hear is almost every
time I take my foot off the brake peddle.  It almost sounds like if there
was an electric pump kicking in to pressurize something.

It's also "pedal," not "peddle."  The latter means to sell.