NATE AC Service Practice Tests

This test compares thermostatic expansion valves (TXV) with fixed-orifice metering devices. You will practice diagnosing overcharge, undercharge, and restriction scenarios on both valve types.

This test focuses on refrigerant charging methods, including liquid charging into the high side and vapor charging into the low side. You will practice charging safety rules and proper technique.

This test covers compressor types, motor types, and starting components used in residential AC systems. You will practice identifying scroll, reciprocating, and rotary compressors, plus capacitor and motor basics.

This test covers airflow diagnostics on the indoor side of AC systems, including dirty filters, dirty evaporator coils, blower problems, and frozen coil troubleshooting.

This test focuses on condenser-side diagnostics, including dirty condenser coils, failed condenser fan motors, and high head pressure. You will practice connecting outdoor unit problems to overall system performance.

This test covers refrigerant leak detection methods, recovery procedures, and system evacuation with a vacuum pump. You will practice choosing the right method for each situation.

This test covers electrical diagnostics specific to AC systems, including the contactor, pressure safety switches, thermostat wiring, and capacitor safety procedures.

This test covers the refrigerants used in residential AC systems, including R-410A, R-32, R-454B, and older R-22. You will practice knowing the safety classifications and handling differences between them.

This final review test mixes refrigerant diagnostics, airflow, electrical troubleshooting, and refrigerant handling into realistic field scenarios, pulling together everything from the earlier tests.