* Year of the van: The system's design and size changed over the years.
* Manufacturer of the rear AC system: Ford didn't necessarily make the rear AC; it could be from a third-party upfitter, and those systems vary greatly.
* Specific model of rear AC unit: Even within the same manufacturer, different models will have different capacities.
To find out the exact amount, you need to:
1. Check the sticker on the AC unit itself: Sometimes, the manufacturer will place a sticker on the condenser or evaporator unit indicating the refrigerant charge amount.
2. Consult your owner's manual (if you have it): While it might not specify the rear AC, it could offer some clues or general guidelines.
3. Check with a Ford dealer or an AC repair shop: They can access service manuals specific to your van's year and any upfitter's information. They may even have a database based on VIN number.
Trying to guess the amount is risky. Overcharging or undercharging the system can severely damage the compressor and other components. Always rely on professional diagnosis and service for AC work.
