AIR CONDITIONING SYSTEM PRECAUTIONS ............................ AC-2 TROUBLESHOOTING ....................... AC-2 Checking of Refrigeration System with Manifold Gauge ........................ AC-4 SPECIAL TOOLS AND TEST EQUIPMENT ..... AC-8 AIR CONDITIONING SYSTEM CIRCUIT ...... AC-9 ON-VEHICLE INSPECTION .................. AC-10 REFRIGERATION SYSTEM .................. AC-11 Checking of Refrigerant Charge ............. AC-11 Installation of Manifold Gauge Set ............. AC-11 Discharging of Refrigeration System ........... AC-12 Evacuating and Charging of Refrigeration System . AC-12 FUNCTIONAL TEST AND ADJUSTMENT ...... AC-16 Vacuum Circuit ........................... AC-16 Power Servo Unit Operation .................. AC-17 Automatic Temperature Control .............. AC-18 Air Mix Damper Linkage .................... AC-19 Sensor Circuit ............................. AC-19 Double Vacuum Valve (DVV) ................. AC-20 Water Temperature Switch .................. AC-20 Condenser Motor .......................... AC-21 SYSTEM COMPONENTS .................... AC-22 COMPRESSOR ............................ AC-23 CONDENSER ............................. AC-36 RECEIVER ............................... AC-37 COOLING UNIT ........................... AC-37 Evaporator ............................... AC-39 REFRIGERANT LINES ...................... AC-40 EXPANSION VALVE ........................ AC-41 VACUUM SWITCHING VALVE (VSV) ........... AC-42