Jasoneo5

iTrader: (4)

What does this do?:

http://cgi.ebay.com/ebaymotors/ws/eB...category=46094

-Jason Elcan

RA40

iTrader: (6)

The expansion valve is an A/C componet I recall. (My repair manual is buried in a box of books so I can't get to it to confirm.)

LS430inTX

RA40 is right. It is part of the A/C system . Without getting too technical, the expansion valve is what allows the freon to convert from a liquid to a gas. It is during this conversion process that the freon turns very cold. How does it get from a gas back into a liquid again you might ask? That's what the compressor does. The expansion valve often contains a small internal filter and is often the 2nd most probable thing to go out (the compressor being the first most probable).