Refrigerant Pressure Switch Construction; Medium-Pressure Switch; Climate Control Unit Construction - Mazda RX-8 2004 Service Highlights

REFRIGERANT PRESSURE SWITCH CONSTRUCTION

• A triple-pressure type has been adopted.
• The refrigerant pressure switch is composed of the high-pressure and low-pressure switches, which cut the A/
C signal to protect the refrigeration cycle if pressure in the refrigeration cycle is too high or too low; and the
medium-pressure switch, which sends an cooling fan control signal according to the operation load of the
cooling fan.

Medium-pressure Switch

• When refrigerant pressure reaches approx. 1.44 MPa {14.7 kgf/cm
and a cooling fan control signal is sent to the PCM.
• When the PCM receives a cooling fan control signal while the A/C is on, it sends an operation signal to the
cooling fan relay.
REFRIGERANT PRESSURE SWITCH
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CLIMATE CONTROL UNIT CONSTRUCTION

• Composed of the following parts:
— Fan switch
— Airflow mode selector switch
— REC/FRESH switch
— A/C switch
— Temperature control dial
— Defroster switch
— Rear window defroster switch
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07–40–6
CONTROL SYSTEM
OPERATING PRESSURE (MPa {kgf/cm
1.11—1.35 {11.4—13.7, 161—195}
ON
OFF
1.44—1.60 {14.7—16.3, 209—232}
DEFROSTER SWITCH
FAN SWITCH
REC/FRESH SWITCH
2
, 209 psi} or more, the contact turns on,
PCM
2
, psi}
COOLING FAN
CONTROL
SIGNAL
AIRFLOW MODE
SELECTOR SWITCH
A/C SWITCH
REAR WINDOW
DEFROSTER SWITCH
TEMPERATURE CONTROL DIAL
CHU074061480S09
MEDIUM-
PRESSURE
SWITCH
CHU0740S006
CHU074013988S01
CHU0740S010