What does the expansion valve and dryer do in the A/C system and why do they need to be replaced every time you recharge the A/C system?
Back history; AC compressor bearings went bad. I replaced the compressor and had a mechanic recharged the system. The mechanic says the expansion valve and dryer need to be replaced and the system be recharged. I do not understand why the dryer and expansion valve need to be replaced when the system was functioning fine before.
Friday, March 1st, 2013 AT 6:56 PM