Hi good day to all. I bought a 4x2 toyota hiliux 3 years ago. At first aircon was so cool, but after the warantty period ends, my aircon cools down. I have sent my car to an aircon technician and he said the system is just ok... Sent the unit to Toyota service center, and they checked the radiator and the coolant, still the temperature is just the same. Previous to that check-up thing, they have already changed the expansion valve. Will someone help me resolve this? How long should someone check up his aircon unit? Thanks!

Probably just needs re-gassing mate. I had this drama in my old land-cruiser. After the regassed the unit, they didn't tighten a certain valve and it leaked out again, about 7 days later.