Subaru 2009 IMPREZA Service Manual page 2702

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HVAC SYSTEM (HEATER, VENTILATOR AND A/C)

4. Refrigerant Charging

A: PROCEDURE

• While working, be sure to wear protective

goggles and protective gloves.

• Air in the cycle can cause insufficient air con-

ditioning, and water in the cycle can cause

clogging in the cycle (icing) and rust. To re-

move this air and water content, use a vacuum

pump to perform evacuation of the system be-

fore filling with refrigerant. By making the in-

side of the cycle a vacuum, the water content

will evaporate even at atmospheric tempera-

tures, and can be removed.

1) Close all valves of the manifold gauge.

L: Low pressure gauge

H: High pressure gauge

(1) Low pressure valve

(2) Vacuum pump valve

(3) High pressure valve

(4) For low pressure

(5) For vacuum pump

(6) For high pressure

Refrigerant Charging Procedure

2) Attach the low pressure side and high pressure

side hoses to the vehicle service port.

Confirm that the connections are secure.

(1) Low-pressure side service port

(2) High-pressure side service port

3) Connect the center manifold hose of the mani-

fold gauge to the vacuum pump.

4) Operate the vacuum pump and open the low

pressure and high pressure side valves. Next, open

the center manifold hose valve, and begin evacua-

Make sure to perform evacuation using a vacu-

(1) Vacuum pump