Honda CRX silhouetteCRX

System Charging - System Evacuation

15-56prose procedure
Continued from 15-55

System Evacuation

  1. 1
    When an A/C System has been opened to the atmosphere, such as during installation or repair, it must be evacuated using a vacuum pump. (If the system has been open for several days, the receiver/dryer should be replaced).
  2. 2
    Attach a gauge set and pump as shown, connecting the center charging hose to the pump inlet.
    Manifold gauge set with low and high pressure gauges connected to a vacuum pump for evacuating the A/C system; the center charging hose runs to the pump inlet. A magnified inset shows a commercially available attachment fitting connected to the high-pressure gauge hose (with an incorrect fitting crossed out). Leader lines label the high and low pressure valves and the attachment.
  3. 3
    Start the pump, then open both gauge valves. Run the pump for about 15 minutes. Close the valves and stop the pump. The low gauge should indicate above 700 mm Hg (27 in-Hg) and remain steady with the valves closed.
    NOTE: If low pressure does not reach more than 700 mm Hg (27 in-Hg) in 15 minutes, there is probably a leak in the system. Check for leaks, and repair (see Leak Test below).
  4. 4
    If there are no leaks open the valves and continue pumping for at least another 15 minutes, then close both valves, stop the pump and disconnect it from the center charging hose.
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