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Which effect arises when an automotive air conditioning system's expansion valve freezes?

A)Refrigerant pressure oscillation
B)Compressor mechanical failure
C)Condenser subcooling increase
D)Evaporator heat transfer gain

💡 Explanation

Refrigerant pressure oscillates because the expansion valve's blockage interrupts the refrigerant flow, initiating unstable evaporation. This causes surging 'hunting' cycles, of high and low pressure, therefore, oscillating pressure results rather than compressor failure which happens over longer periods.

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