vintage auto air conditioning systems in most mid-1960s to mid-1970s GM vehicles and some 1970’s Fords include a POA valve. POA - an abbreviation for Pilot Operated Absolute - valves are suction valves used...
All air conditioning systems have something built into the system to prevent your car's evaporator from getting so cold that it freezes. In some systems, this mechanism is a thermostat. However, in most mid-'60s...