1. Verify the Refrigerant Charge:
* Accurate Charge: Just because you added refrigerant doesn't mean it's the correct amount. Adding too much can be just as bad as adding too little. You need to use a gauge set with a low-side and high-side pressure gauge to ensure you're within the manufacturer's specifications for your 2000 Ford Explorer. These specifications should be in your owner's manual or readily available online. The pressures will vary depending on the ambient temperature. An improperly charged system can damage the compressor.
* Leaks: The most likely reason your AC system was low on refrigerant in the first place is a leak. Even a tiny leak can gradually deplete the system. You need to find and fix this leak before adding more refrigerant (otherwise you'll just keep wasting refrigerant and money). A leak detection dye can be added to the system to help pinpoint the location of a leak. Often leaks occur at the seals, hoses, condenser, evaporator or compressor. A professional AC technician will have the tools and knowledge to detect these leaks effectively.
2. Check the AC System Components:
* Compressor Clutch: Does the compressor clutch engage when you turn on the AC? You should hear a click and feel or hear the compressor running. If it's not engaging, the problem could be a bad clutch, low voltage, a faulty cycling switch, or a problem with the compressor itself.
* Condenser: Inspect the condenser (located in front of the radiator) for damage (bent fins, debris). A damaged condenser can restrict airflow and reduce efficiency. Clean it thoroughly if necessary.
* Evaporator: The evaporator is inside the dashboard and more difficult to access. Issues here often involve leaks or restricted airflow through the vents (blocked drain, etc).
* Expansion Valve/Orifice Tube: These are crucial components that regulate the refrigerant flow. A malfunctioning expansion valve or orifice tube can prevent proper cooling. Testing these often requires specialized equipment.
* Blower Motor: Make sure the blower motor itself is working and blowing air. If it's not blowing, there's a separate issue with the blower motor or its associated circuitry.
3. Where to Go From Here:
* DIY Attempt (Advanced): If you're mechanically inclined and have experience with automotive AC systems, you *might* be able to troubleshoot further. However, without proper tools and experience, you risk causing more damage.
* Professional AC Technician: This is the strongly recommended approach. An experienced technician has the equipment (vacuum pump, leak detection dye, pressure gauges, manifold gauges) and expertise to diagnose the problem accurately and repair it correctly. Attempting further repairs yourself without this equipment could lead to expensive damage to your AC system.
In short: Adding refrigerant only masks the underlying problem. Find and fix the leak, then recharge the system professionally for optimal and safe operation. Going to a qualified mechanic is likely the most cost-effective solution in the long run.
