Question about Car brakes

[Semidevil]

So my nissan altima all of a sudden made a pulsating sound when I brake, and also when I start the car and change gears from P to D. I went to my Hibdons tire place and suggested I turn/shave my 2 front rotors. the visual inspection shows the brakes as being still good.

After I got my car back, I still hear/feel the pulsating sound when I brake or start the car.

Now, I notice that it only does that when the A/C is turned on. while it is pulsating, if I turn my a/c off, the pulsating will stop.

any idea what this could be? whats the problem and how to fix it?

 

[Summitdrinker]

wrong forum area

Was in wrong forum area. I have moved to here (the garage)

AnandTech Senior Moderator
Compuwiz1

 

[cardiac]

Check to make sure that the serpentine belt doesn't have any chunks missing from it, or that the tensioner is not too loose. When you turn on the A/C, it puts a lot more "drag" on the belt, and weakness's will come out then.....

Bob

 

[Semidevil]

I checked the belt and it seems okay. no problems there. I took it to 2 shops to get it inspected and both says they do not know what it is.

now, pretty much everytime I start the car and change gears from "park", the sound will come on, and I feel its getting louder....if I turn off the A/C, it will be fine.

any other suggestions will be appreciated.

repairshop guys seem to not be able to see the danger in the sound, but I Just dont feel right about it.

thanks.

 

[Pliablemoose]

Maybe your AC compressor is toast or getting ready to fail?

What year, engine (4 or 6 cyl) & how many miles on your car?

 

[Semidevil]

its a 2002 nissan altima, 2.5, 4 cyl, and around 87k miles. the repairman even checked my ac and said it is fine.

not sure what else it could be.



I have another queston while looking under the hood(not sure if it is related or not)

here is a pic that I found from google:

http://www.flickr.com/photos/9022282@N06/1352410650/

where the 2 arrows are, this giant piece seems to connect very loosely. it doesn't even have screws attached, and I can even take it out easily. do I need to care about that?