You don't normally change the expansion valve and the dryer just like that. If it's leaking (I assume water yung nag-le-leak) then yung condensate nga imbis na lumabas sa loob tumutulo. PLs check yung hose na nakatutok sa flooring mo. Pag matagal mo na hindi napalinis then cleaning tapos pa-check mo yung hose kung properly mounted. May casing kasi yung evaporator and a drain at the bottom connected to the hose going to the flooring nung car. Kung barado yung expansion valve they will see this sa reading sa high side ng A/C line mo. Dryer pinapaltan normally pag nagpapalit lang ng compressor. HTH!