Vintage Air SureFit Condenser Kit 21567, for 1967-72 C10 and C20 Chevy & GMC Trucks

[Richard]

Insufficient airflow across the the condenser will cause low suction pressure and higher head pressure. Why would you set POA under freezing? Should be at around 27.5 PSI. The stock mounting with condenser spaced away from radiator is not good for airflow unless driving at speed. Mount against rad, construct a shroud or add an auxiliary fan to improve performance at stops or low speeds.