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HOMESERVICE MANUALSPLYMOUTH1974FURY III 4D HARDTOP, 5.9L ENG VIN JREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONBASIC TROUBLE SHOOTINGAIR CONDITIONER & HEATER - MANUAL SYSTEMS (TESTING)VACUUM CONTROL SYSTEMSYSTEM TEST
1974 Plymouth Fury III 4D Hardtop, 5.9L Eng VIN J

System Test

1974 Plymouth Fury III 4D Hardtop, 5.9L Eng VIN JSECTION System Test

Disconnect source vacuum hose at engine manifold. Insert vacuum probe in source hose and proceed as follows:

  1. With gauge in position so that it may be seen from driver's seat, push HEAT button and note vacuum drop. Vacuum gauge will return to 8" after actuator operation Press each button in turn, noting momentary vacuum drop after each button is depressed. Maximum allowable vacuum drop below 8" during each actuator operation is 3/4". If vacuum drop is more than 3/4" recheck test equipment for exactly 8" vacuum. Also check hose connector plug on control switch, making sure it is fully positioned on the 7 prods of the switch.
    NOTE: Do not use lubricant on switch prods or in holes of connector plug. If necessary, use a drop of water in each connector plug hole.
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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.