Heating and Air Conditioning: Locations

A/C System Components, Locations





1 - High pressure service valve cap
- thread: 3/8 in. UNF
2 - A/C pressure switch, F129
- switches A/C compressor clutch OFF if system pressure is too low (low refrigerant charge)
- switches A/C compressor clutch OFF if system pressure is too high
- switches radiator cooling fan into second speed as a result of A/C system pressure rise
- unscrew to remove (Schrader valve installed below switch to allow removal without system discharge)
- 0-ring seal on connection: 10.8 mm inside diameter, 1.8 mm thickness
- 8 Nm (6 ft lb)
- checking, Refrigerant Pressure Sensor / Switch
3 - Ambient temperature switch, F38
- switches A/C compressor clutch OFF at low ambient temperatures
- checking, Ambient Temperature Sensor / Switch HVAC
4 - Low pressure service valve cap
- thread: 7/16 in. UNF
5 - Expansion valve
6 - Evaporator water drain valve
- prevents air from being drawn in by fresh air blower
- allows water to drain freely
- removing/installing, Service and Repair
7 - Vacuum hose connection
- for fresh air recirculating flap
- routes through heater core outlet connection
8 - A/C compressor clutch relay, J44 and radiator cooling fan relay (2nd stage), J101
9 - Vacuum reservoir
- insert vacuum hose 30 mm (1.2 in.) into reservoir
- vacuum hose layout, Vacuum and Vapor Hose Diagrams
10 - Fresh air recirculating flap two way valve, N63
- controls fresh air recirculation flap vacuum servo
- actuates servo when voltage is supplied with engine running
- vacuum hose layout, Vacuum and Vapor Hose Diagrams
11 - Vacuum check valve
- arrow on valve points toward vacuum source (engine)
12 - Condenser
13 - A/C compressor clutch, N25
- checking, Testing and Inspection
14 - Safety relief plug
- mounted on receiver drier
- releases if maximum safe A/C system operating pressure is exceeded