* Specific model of Tahoe: Even within the 1999 model year, different trim levels and options might have slightly different systems.
* Type of refrigerant: Older systems used R-12, while later ones (though unlikely for a 1999) might use R-134a. 1999 Tahoes almost certainly use R-134a.
* Condition of the system: Leaks in the system would obviously reduce the required amount.
To find the correct amount of refrigerant:
1. Check your owner's manual: This is the best place to start. It should specify the correct refrigerant type and capacity.
2. Consult a repair manual: A Haynes or Chilton repair manual for your specific year and model Tahoe will provide this information.
3. Consult a qualified AC technician: This is the safest and most reliable option. They have the equipment to properly diagnose any issues with your system and determine the correct amount of refrigerant needed.
Trying to find the capacity online without knowing the exact specifications of your Tahoe's AC system is unreliable and could lead to overcharging or undercharging, potentially damaging your compressor. Always consult a professional for accurate information and safe refrigerant handling.