Which malfunction leads R-134a refrigerant to overheat excessively in scroll compressors?

💡 Explanation

Excessive overheating happens because insufficient oil return impairs lubrication and heat transfer within the scroll compressor, forcing the vapour compression cycle to undergo *isentropic compression* to a greater extreme than it otherwise might. Therefore, A is correct; rather than issues caused by the TXV or auxiliary devices.

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