Mixing refrigerants typically leads to high-side pressure that's too high due to chemical incompatibility and affects the efficiency of the HVAC system. Other symptoms may arise, but erratic compressor clutch behavior is a direct consequence of this mixing. Thus, option D is the most accurate response. ;
The most accurate response to mixing refrigerants is option D: high-side pressure that's too high. Mixing can adversely affect system performance, most notably increasing high-side pressure. Erratic compressor clutch behavior may also occur, but it's not the primary issue.
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