Join Date: Aug 2005
Location: , CT
Feedback Score: 7 reviews
Just replace it. It's less than $10 from the dealer. My Haynes manual says to test it you remove it and shake it. It you hear it rattling, it's good...it there's no shaking sound inside, it's bad. But you have to take it off to do that anyways, mind as well put a new one in. I'm not sure if there's another way to test it (by checking for suction on a vacuum line or something).
But that being said...that little thing is a total bitch to replace. It's one of the most aggravating things i've had to do to my car. Get ready to do some de-stressing when you finish...aka, have a 6-pack handy.