The freon capacity for a 2005 Chevy Uplander's air conditioning system depends on whether it has a single-zone or dual-zone climate control. There's no single answer.
You must consult your owner's manual. The manual will specify the refrigerant type (R-134a is likely) and the precise amount needed.
Trying to find this information online without the specific details from your owner's manual is unreliable and could lead to overcharging or undercharging your system, both of which can damage the AC compressor.
