Weak AC on idle, but gets back to normal when car is running

[MysteryMillenia]

Same issue. Mitsubishi Strada L200 4x4 MT (1999).

Need ko ba palitan yung evaporator, condenser at upgrade yung blower? May nagsabi rin na pag OEM, hahayaan na lang but it seems older models’ air conditioners doesn’t work the same as modern models (for example, Innova 2016 and Hilux 2017 in my experience, kahit idle o nainitan, lumalamig parin).