Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1974FURY III 4D HARDTOP, 5.9L ENG VIN JREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)GENERAL SERVICINGCOMPONENT REPLACEMENTCOMPRESSOR REPLACEMENTISOLATING THE COMPRESSOR
1974 Plymouth Fury III 4D Hardtop, 5.9L Eng VIN J
Isolating The Compressor
1974 Plymouth Fury III 4D Hardtop, 5.9L Eng VIN JSECTION Isolating The Compressor
- Remove caps from compressor service valve stems and service ports, connect manifold gauge set to service port connections, purge test hoses, then crack compressor service valves so that system pressures are indicated on test gauges.
- If system has been fully discharged previously (zero high pressure gauge reading), system should be slightly charged so that high pressure gauge reading is above zero to prevent air and moisture entering when connections are broken.
- Front-seat suction (inlet) service valve by turning valve stem in fully. Operate the compressor until low side (suction) gauge reading drops to 2 psi. Stop compressor, front-seat discharge (outlet) service valve by turning valve in fully and disconnect compressor clutch lead to prevent compressor operation with this valve front-seated.CAUTION: Compressor must never be operated with this discharge valve front-seated (closed) as damage to compressor valves would result.
Compressor is now isolated from system.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.