* Low-pressure port: This is where you'll connect the hose to add refrigerant. It's usually identified with a smaller diameter fitting and sometimes marked with a blue cap or a label indicating "low" or "suction."
* High-pressure port: This port is typically larger and may have a red cap or be labeled "high" or "discharge." You generally *don't* connect your recharge hose to this port unless you're using a specific type of AC machine that requires it. Attempting to add refrigerant to the high-pressure side can be dangerous.
Important Considerations:
* Location: The ports might be near the compressor, condenser, or drier. Look carefully around these components.
* Visual Identification: The ports themselves are usually threaded fittings. They're often capped to prevent leaks.
* Consult a Repair Manual: A service manual specific to your 1993 Chevy truck model will give you precise diagrams and locations. This is the most reliable way to find the ports.
* Safety: Working with refrigerant can be dangerous. If you're not comfortable with this procedure, it's best to take your truck to a qualified mechanic. Improper handling can lead to injury or damage to your AC system.
Instead of trying to find the ports yourself, I strongly advise consulting your vehicle's repair manual or taking your truck to a qualified mechanic for AC service. This will prevent potential damage and ensure proper charging.
