ASE T7 HVAC (Medium Heavy Truck) Practice Questions - ASE T7 - Heating, Ventilation & Air Conditioning (Medium Heavy Truck) Certification Exam

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Before connecting a manifold gauge set or recovery machine to a truck A/C system, the technician must FIRST identify which refrigerant the system uses. What is the safest way to confirm whether the system is R-134a or R-1234yf?

Check the underhood refrigerant label and use a refrigerant identifier Connect the gauges and watch the pressure Smell the service port Assume R-134a because the truck is older

Correct Answer:

Check the underhood refrigerant label and use a refrigerant identifier

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