* Low Refrigerant (despite recharge): A seemingly simple issue, but there could still be a leak somewhere in the system. The recharge only temporarily solved the problem. A leak detection test is crucial here.
* Compressor Issues: The compressor might be weak, failing, or not engaging properly. It could be a clutch problem (the electromagnetic clutch that engages the compressor), a faulty compressor itself, or a problem with the compressor wiring or relay. Listen closely for any unusual noises coming from the compressor when the AC is on.
* Condenser Problems: The condenser (located in front of the radiator) could be clogged with debris, bent, or leaking. A clogged condenser restricts airflow, reducing cooling efficiency.
* Evaporator Issues: The evaporator (inside the dashboard) could be dirty or clogged, restricting airflow and cooling. This often requires professional cleaning or replacement.
* Expansion Valve/Orifice Tube Problems: These components regulate refrigerant flow. A malfunctioning expansion valve or orifice tube can restrict flow, preventing proper cooling.
* Blower Motor Issues: While the recharge focuses on the refrigerant, a weak or failing blower motor could reduce the airflow, making even correctly cooled air feel less cold.
* Blend Door Problems: The blend door controls the mix of hot and cold air. A malfunctioning blend door could be mixing in too much outside air, diluting the cool air from the AC system. This is often a vacuum-related issue.
* Incorrect Refrigerant Charge: While unlikely if a professional did the recharge, it's possible the wrong amount of refrigerant was added, or the wrong type of refrigerant was used.
Troubleshooting Steps (Some require professional tools):
1. Leak Detection: This is the *first* thing to do. A professional mechanic can use a leak detection dye or electronic leak detector to pinpoint any leaks in the system.
2. Compressor Check: Listen for unusual noises (whining, grinding). Check the compressor clutch engagement by feeling for it pulling in when the AC is turned on (often requires a helper).
3. Condenser Inspection: Visually inspect the condenser for damage or blockages.
4. Blower Motor Test: Check the blower motor speed and functionality.
5. Pressure Test: A professional can perform a pressure test to determine if the system pressure is within the proper range. This helps diagnose problems with the compressor, expansion valve, or condenser.
Recommendation:
It's highly recommended you take your S10 Blazer to a qualified automotive AC technician. Trying to diagnose and repair AC problems yourself can be difficult and potentially dangerous due to the refrigerant involved. They have the tools and expertise to properly diagnose and fix the underlying issue. Simply recharging the system repeatedly without finding the leak won't solve the problem and will waste refrigerant and money.
