Two different kinds of systems were used on factory air conditioned 1973 Pontiac Grand Prix’s. The 1st version was like the 1972, with a separate Filter-Drier, Expansion Valve and POA Valve. The later 1973 version instead used a VIR (Valves-in-Receiver) which combined an Expansion Valve, a POA Valve and an Accumulator (replacing the function of the Filter-Drier) in one valve.

Like all Suction Valves, the POA Valve on the earlier model 1973 Grand Prix’s is mounted to the Evaporator’s suction (top) outlet and regulates system pressure to prevent the Evaporator from freezing.

Our Part Number 15-202 is our 15-52 type GM POA Valve designed for an early 1973 Pontiac Grand Prix using 134a refrigerant. For R12 refrigerant, request Part Number 15-202R.

NOTE:

A core charge is also required.

A/C INFO:

All car air conditioning systems need a mechanism to keep the Evaporator from getting so cold that it freezes. In some systems, this mechanism is a thermostat. In the early model 1973 Pontiac Grand Prix’s, it was a POA Valve. A thermostat prevents the Evaporator from freezing by cycling the Compressor on and off based on Evaporator temperature. A POA Valve prevents the Evaporator from freezing by by-passing excessive system pressure. Note that in a POA Valve type system like the early model 1973 Pontiac Grand Prix’s, the Compressor runs constantly whenever the air conditioning system is operating.

Air Conditioning Tip:

If you are converting to 134a refrigerant, your POA Valve will need to be recalibrated, as 134a and R12 by-pass pressures differ. More on converting to 134a.

Air Conditioning Tip

If you are replacing your POA Valve on an otherwise operating system, its failure is likely as a result of contaminants causing it to stick in the open position, forcing it to constantly by-pass. As is the case with any air conditioning system, flushing the system to insure that re-used parts do not contaminate newly replaced or restored parts and replacing or restoring the car’s Filter-Drier are essential to avoid a repeat of the same problem.

More information on GM Valves?

If you prefer, we can rebuild your late 1965 Grand Prix POA Valve for you. Call or email us.