ASE H7 HVAC (Transit Bus) Practice Questions - ASE H7 - Heating, Ventilation & Air Conditioning (Transit Bus) Certification Exam

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A transit bus roof-mounted A/C unit will not cool. The technician's first step before connecting manifold gauges should be to:

Verify the compressor clutch or open-drive belt engages and the evaporator/condenser fans run Recover all refrigerant from the system Replace the receiver-drier Add one pound of R-134a to the system

Correct Answer:

Verify the compressor clutch or open-drive belt engages and the evaporator/condenser fans run

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