:supposed to at. The way I interpret the manual's cryptic statement is that the system is intended to assist the bypass type expansion valve. My guess is that when ambient temperatures are hot (85 to 100), the expansion valve and oil filled tube control for diverting the refrigerant directly to the compressor is sufficient. When temperatures are on the cool side (50 to 70) the mechanical system needs the help of the TCA.
:This a/c is way too complicated. I have no idea why R12 systems had the "throttle control valve". Is the TCA exclusive to R134a systems?The TCA was also used on manual R12 systems. The throttle suction valve was only used on auto R12 systems. The TSV provided backpressure to the evaporator so that the boiling point of the refrigerant was maintained above the freezing point of water, no matter how hard the compressor was pulling. My evaporator would freeze up even on hot days if I was at highway speeds and there was a lot of airflow through the condenser. The airflow through the evaporator would slowly get choked off as it froze over, and would even blow a few flakes of ice out of the center vent.
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