Air Conditioning System: Evacuating

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

CONNECT QUICK DISCONNECT ADAPTER TO CHARGING HOSES
REMOVE CAPS FROM SERVICE VALVES ON REFRIGERANT LINES
SET ON MANIFOLD GAUGE SET
1. Close both the hand valves of the manifold gauge set.
2. Connect the quick disconnect adapters to the service valves.
  
  Fig 1: Identifying Adapter Components
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
EVACUATE AIR FROM REFRIGERATION SYSTEM
1. Connect the vacuum pump adapter to the vacuum pump.
  
  Fig 2: Locating Vacuum Pump Adaptor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the center hose of the manifold gauge set to the vacuum pump adapter.
3. Open both the high and low hand valves and run the vacuum pump.
4. After 10 minutes or later, check that the low pressure gauge indicates 750 mmHg (30 in. Hg) minimum.
  HINT:
  
  If the reading is higher than 750 mmHg (30 in. Hg), close both the hand valves of the manifold gauge set and stop the vacuum pump.
  
  Check the system for leaks and repair if necessary.
5. Close both the high and low hand valves and stop the vacuum pump.
6. Leave the system in this condition for at least 5 minutes and check that there is no gauge indicator.
  
  Fig 3: Connecting Manifold Gauge Set
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002