To avoid evaporator odor, you operate AC System in FRESH mode not RECIRC mode.

Technician A is correct. Technician B is wrong because an overcharge will cause the compressor outlet to be cold.

Both technicians are correct. Courtesy of Toyota

When both the low and high sides are high, this indicates a refrigerant overcharge or restricted condenser. Courtesy of Toyota

You never reuse compressor oil.

With power and a ground, the clutch should have worked unless the gap is too wide, and is the most likely cause.

Technician A is correct because if thermal protector fails the B+ path to the compressor clutch is open and it is the most likely cause. Technician B is wrong because temperature door position does not affect compressor operation on a manual system.

Both technicians are correct.

System evacuation will not remove all of the moisture in the desiccant of a receiver/dryer due to its enclosure.

When the expansion valve is stuck closed, both high and low pressure are low.

Both technicians are correct.

A stuck expansion valve is the most likely cause based on both high and low pressures being low.

Both technicians are correct.

Technician A is wrong because both heater hoses should be hot. Technician B is right because the upper radiator hose should be too hot to hold.

An inoperative condenser fan can cause a high high-side and high low-side reading. Answer option A is wrong because high high-side and low low-side pressure generally indicates a restriction evaporator air flow. B is wrong because high low-side and low high-side pressure indicate internal compressor damage. C is wrong because when both high and low-side pressure are low you can have the following faults: low charge, suction line obstruction, clogged orifice tube, stuck closed TXV valve and restricted line from the condenser to the evaporator.

A clogged radiator is the most likely cause because a restriction of any kind in the cooling system will cause an engine to overheat. Answer option A is not a most likely cause because a constantly running cooling fan will not cause overheating. B is not a most likely cause because a restriction heater core will cause no heat but not necessarily cause an engine overheat. C is also wrong because a stuck open thermostat will not cause overheating.

Technician A is right because a misadjusted blend door affects heat. Technician B is wrong because the high blower is controlled by the high blower relay not the resistor trio.

Both technicians are correct.

Technician B is right because when the system is low on coolant there is insufficient material to transfer the heat. Technician A is wrong because a stuck thermostat causes overheating resulting in high temperatures and plenty of heat.

A specific engine temperature is needed to consume all of the pollutants.