Originally posted by dealer502:
this is one part i have never replaced. are they dirty? can you tell any difference after the change? is it hard to do? does it need to be done? 
For a pic of one after 15k:
http://www.picturetrail.com/svtstpete/674422 EDIT: Mine is not that dirty because I rarely use AC/heat.
You may or may not be able to tell a difference. It really depends how dirty it is. You'll notice when you turn on heat/air.
It
needs to be done. Trust me. I work for a company that deals with lead, asbestos, mold, mildew, etc. The horror stories I've heard and read.
