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Intermittent Cooling

  1. Check that fan motor operates in all 4 speeds, air duct closes off outside air and heater water valve is closed. Adjust belt tension and clean condenser.
    NOTE: If system doors allow air leaks, evaporator will freeze up and no testing will be possible.
  2. Adjust engine speed to 2500 RPM. Set controls for maximum cooling and high fan. Insert thermometer in left air duct and close all other ducts. With vehicle out of sun, close windows and doors and connect pressure gauges. Operate system for 10 minutes.
  3. Check for cool air fom left duct. Low pressure gauge should read more than 16 psi. If not, hold hands around expansion valve to warm valve. If pressure rises, moisture is present in system. Discharge, evacuate and recharge system using approved refrigerant recovery/recycling equipment. If pressure does not rise, go to next step.
  4. Check temperature on thermometer when thermostatic switch turns compressor off. If temperature is 39°F, system is okay. If lower than 39°F, check that capillary tube installed is 7" long on all models except Rabbit Pickup. Capillary installation for Rabbit Pickup should be 4" long. If installation is correct, replace thermostatic switch.
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