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Thermal expansion valve drops pressure of liquid refrigerant. It prevents ice formation on the evaporator. Systems using fixed orifice tube have an evaporator low pressure cutout on the compressor plus an accumulator to prevent issues.
Another great point since the lmtv ac evaporator has the heater core regulated by a coolant flow control instead of a blend door. Valves are prone to leaking especially with the engine thermostat closed.
The Sanden SD7 series was never made for R12. Yes, Sanden was making R12 compressors back then.. Besides, the oil in the system is for 134.
Novices confuse temperature with cooling capacity. And this is air conditioning, not air cooling. You must know the dew point when making temperature...
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