* Refrigerant Charge: While you mentioned no leaks, the system might still be low on refrigerant. A tiny leak, difficult to detect, can slowly deplete the charge over time. Proper AC system diagnosis *requires* checking refrigerant levels with gauges, not just visually inspecting for leaks. Low refrigerant prevents proper cooling.
* Refrigerant Type: Ensure the correct type and amount of refrigerant are used. Using the wrong refrigerant can severely damage the system and prevent it from working. R-134a is commonly used in 1993 vehicles but verify with your owner's manual.
* Condenser Fan: The condenser fan pulls air across the condenser to dissipate heat. If this fan isn't working, the condenser can't cool the refrigerant effectively, resulting in warm air. Check the fan for operation and if it's powered.
* Evaporator: The evaporator is inside the car and responsible for cooling the air. It could be clogged with debris restricting airflow, or it might have a problem with its internal fins.
* Expansion Valve or Orifice Tube: These components regulate refrigerant flow. A malfunctioning expansion valve or orifice tube can restrict or prevent proper refrigerant flow, hindering cooling. This is a common cause of poor AC performance.
* Pressure Switch or Cycling Switch: These switches control the compressor's operation. A faulty switch might prevent the compressor from engaging or cycling correctly.
* Compressor Clutch: Even with a new compressor, the clutch might be malfunctioning, preventing the compressor from engaging. This needs to be tested electrically and mechanically.
* Electrical Issues: Wiring problems, blown fuses, or a faulty relay can also prevent the AC system from working correctly. Check all fuses related to the AC system.
* Blower Motor Resistor: While this wouldn't directly affect the AC system's cooling capacity, a faulty blower motor resistor could lead to weak airflow, making it *feel* like the AC isn't working well even if it is producing cool refrigerant.
In short: A new compressor is only one component of a complex system. Professional AC diagnostics with pressure gauges and other diagnostic tools are necessary to pinpoint the exact cause of the problem. Trying to troubleshoot this yourself without the proper tools and knowledge can be frustrating and potentially damage the system further. Take it to a qualified automotive technician specializing in air conditioning repair.
