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Home >> Cadillac >> 1969 >> Calais Not Available, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic Temperature Control - Rear Unit >> Control Components >> POA Valve
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POA Valve

Is located on the left front side of the evaporator assembly, in the low pressure line to the compressor. The valve works in the same manner as the front system valve but is calibrated to control the rear evaporator pressure to 27 psi.