If your AC becomes cold pag umaandar ka especially at more than 40kph, pero pag standstill walang lamig = aux fan.

Check mo muna yung glass sa drier, kung may bubbles, you're low sa freon. before recharging the freon, pa leak test mo muna... Hopefully freon lang kailangan mo...

Usual leak areas are hose joints, pressure switch, expansion valve, evaporator (if you dont get your AC cleaned often)... hopefully wag compressor (easy 15K), evaporator (over 10K if orig)...