Nissan Primera P11. Instruction — part 486
(2) When set to HI
The air flow volume arithmetic circuit gives current to Tr
p
1
,
which turns the HI relay on. Thus, the blower motor rotates
in the HI condition. Also, Tr
p
2
and Tr
p
3
are receiving cur-
rent and as a result the ML and MH relays are on.
(3) When set to LO
The air flow volume arithmetic circuit does not give any cur-
rent to Tr
p
1
,
p
2
nor
p
3
.
Only the LO relay turns on and so the blower motor rotates
in the LO condition.
SHA574CA
Air flows
volume
arithmetic
circuit
HI
relay
MH relay
ML relay
Blower
motor
Resistor
Fan switch
(AUTO)
LO relay
Auto amp.
SHA576CA
Air flows
volume
arithmetic
circuit
HI
relay
MH relay
ML relay
Blower
motor
Resistor
Fan switch
(AUTO)
LO relay
Auto amp.
SYSTEM DESCRIPTION
AUTO
Control System Output Components (Cont’d)
HA-97
STARTING FAN SPEED CONTROL
The starting fan control system is so designed to prevent excess cold air from being expelled after the engine
is started when the engine coolant temperature is low.
The component parts related to this system are the water temperature sensor microswitch, HI, MH, ML and
LO relays, blower motor, resistance and auto amplifier.
When the fan switch is set to AUTO, the mode is selected either B/L, FOOT or FOOT/DEF and the engine
coolant temperature is below 56°C (133°F), the speed of the blower motor is fixed in the LO position.
LO, ML, MH AND HI RELAYS
The LO and ML relays are located on the auto amplifier bracket,
and the MH and HI relays are installed on the back side of the
audio unit. Each fan relay operates according to the air flow vol-
ume determined by the auto amplifier. The blower motor then
operates accordingly.
SHA188DA
Blower
speed
1.0
0 (32)
50 (122)
°C (°F)
Auto amp.
.
Constant voltage
transformation
Sensor voltage
.
Air mix door
position arithmetic
circuit
Air flow volume
arithmetic cir-
cuit
Mode switch
Water temperature meter
Thermal
transmitter
Fan switch (AUTO)
LO relay
ML relay
MH relay
HI relay
.
Blower motor
Resistor
NHA304
.
LO relay
.
ML relay
.
HI relay
.
MH relay
SYSTEM DESCRIPTION
AUTO
Control System Output Components (Cont’d)
HA-98
SHA578CA
Auto amplifier
Air flows volume arith-
metic circuit
HI relay
MH relay
ML relay
LO relay
Fan switch (AUTO)
IGN
ACC
Resistor
SYSTEM DESCRIPTION
AUTO
Control System Output Components (Cont’d)
HA-99
HFC-134a (R-134a) Service Procedure
SETTING OF SERVICE TOOLS AND EQUIPMENT
DISCHARGING REFRIGERANT
WARNING:
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from A/C system using certified service equipment meeting
requirements of HFC-134a (R-134a) recycling equipment or HFC-134a (R-134a) recovery equipment.
If accidental system discharge occurs, ventilate work area before resuming service. Additional health
and safety information may be obtained from refrigerant and lubricant manufacturers.
EVACUATING SYSTEM AND CHARGING REFRIGERANT
SHA539DC
Shut-off valve
A/C service
valve
Recovery/Recycling/Recharghing equipment
SHA540DC
Shut-off
valve
A/C service
valve
Recovery/Recycling/Recharging equipment
Shut-off
valve
A/C service
valve
For charging
Refrigerant
container
(HFC-134a)
Weight
scale
For evacuating
vacuum pump
Manifold gauge set
SERVICE PROCEDURES
AUTO
HA-100
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