What is the refrigerant capacity shown on this diagram?

The legend lists REFRIGERANT - 3.25 LBS (spec code 250).

How much refrigerant oil does the diagram specify?

OIL REFRIGERANT - .0063 QTS (spec code 114).

What GM part numbers appear in the parts legend?

9419303 (screw), 3973725 (clamp), 3917385 (strap), 8526398 (gasket "O" ring), and 3140600 (gasket "O" ring).

At what angle is the expansion valve mounted?

A detail on the diagram shows the expansion valve oriented 60° from vertical (labeled '60° REF' next to 'VERTICAL').

What major A/C components are labeled in the illustration?

Receiver-dehydrator, inlet tube assembly, fitting assemblies, heater hoses, expansion valve, and the P.O.A.S.T. valve.

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1970 Pontiac Firebird A/C Hose Routing Diagram - Receiver-Dehydrator & POA Valve

Air conditioning hose and component routing schematic showing receiver-dehydrator and fittings

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A/C system schematic showing hose routing, receiver-dehydrator, expansion valve and fitting assemblies with parts callouts.

AI caption April 2020 · Photo 8 of 8

This is a scanned page from a factory assembly manual / parts illustration showing the air conditioning refrigerant hose and line routing at the front of an engine compartment, uploaded to a 1970 Pontiac Firebird gallery. The exploded-view schematic depicts the A/C system components: the receiver-dehydrator mounted beside the radiator, the inlet tube assembly, fitting assemblies, hose routing over the engine, heater hoses, the expansion valve (shown installed at 60° from vertical per a reference detail), and the P.O.A.S.T. valve. A parts legend lists callout numbers with GM part numbers: 9419303 screw (3), 3973725 clamp (4), 3917385 strap (5), 8526398 O-ring gasket (6), and 3140600 O-ring gasket (7). Service fill specifications are given as refrigerant oil charge of .0063 quarts (spec code 114) and refrigerant charge of 3.25 lbs (spec code 250). Hand-drawn arrows mark two attachment/routing points of interest. A reader can learn correct A/C hose routing, clamp and strap locations, O-ring placement at fittings, the expansion valve mounting angle, and the system's refrigerant and oil capacities.

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Frequently asked questions

What is the refrigerant capacity shown on this diagram?: The legend lists REFRIGERANT - 3.25 LBS (spec code 250).
How much refrigerant oil does the diagram specify?: OIL REFRIGERANT - .0063 QTS (spec code 114).
What GM part numbers appear in the parts legend?: 9419303 (screw), 3973725 (clamp), 3917385 (strap), 8526398 (gasket "O" ring), and 3140600 (gasket "O" ring).
At what angle is the expansion valve mounted?: A detail on the diagram shows the expansion valve oriented 60° from vertical (labeled '60° REF' next to 'VERTICAL').
What major A/C components are labeled in the illustration?: Receiver-dehydrator, inlet tube assembly, fitting assemblies, heater hoses, expansion valve, and the P.O.A.S.T. valve.