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Home >> Volkswagen >> 1984 >> Rabbit Base, Standard >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> A/C-Heater System - Manual >> Testing >> System Test >> No Cooling
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No 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.
  2. Inspect receiver-drier pressure seal. If seal is good, go to step 5). If seal is broken, evacuate and charge system. If system cools properly, testing is complete. If system does not cool, connect pressure gauges.
  3. Set engine speed at 2500 RPM. Insert thermometer in left fresh air outlet and close all other ducts. Place controls on high fan and maximum cooling. With vehicle out of direct sun, close all windows. Radiator fan should come on with system pressure at 200 psi.
    NOTE: If system doors allow air leaks, evaporator will freeze up and no testing will be possible.
  4. If fan does not operate, replace pressure switch. System is okay. If fan does come on, turn off engine and check for condenser obstructions and blocked air flow.
  5. Turn air conditioner on and off with temperature control lever. Check that compressor clutch engages. Push lever to extreme right position and back again. A click should be heard from compressor clutch. If not, check for voltage at coil wire with switch on. If voltage is present, replace clutch coil. If not, check wiring or replace thermostatic switch.
  6. If compessor clutch operates, check gauge readings. If both are low, locate leak and recharge system. If both are high, replace expansion valve. If low side is too high and high side reads too low, replace or rebuild compressor.
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