* Specific model of Suburban: 1500, 2500, etc. Different models have different HVAC systems.
* Whether it has a single compressor or two: While it has dual climate controls, the system might use a single compressor or two separate compressors.
* Size of the condenser and evaporator: These components vary slightly even within the same model year.
To find the correct freon capacity, you need to:
1. Locate your vehicle's sticker: Check the driver's side doorjamb or the glove compartment. This sticker often lists the refrigerant type and capacity. Look for R-134a (the refrigerant used in 1999 Suburbans).
2. Consult your owner's manual: The owner's manual should specify the correct refrigerant type and amount.
3. Check a reliable online parts database: Websites like AutoZone, Advance Auto Parts, or RockAuto allow you to search by your vehicle's year, make, and model to find specifications. However, the information may not always be entirely reliable.
4. Consult a qualified mechanic: A mechanic will have access to accurate specifications based on your vehicle's VIN and can properly diagnose and service your AC system. This is the most reliable method.
Do not attempt to add refrigerant without properly diagnosing the system. Low refrigerant is a symptom, not a problem. There could be a leak somewhere in the system that needs to be fixed before adding any freon. Improperly charging the system can damage the compressor.
