Opel Frontera UBS. Service manual — part 22
1A – 4 HEATING AND VENTILATION
AIR SELECT KNOB
The air selector knob allows you to direct heated air
into the passenger compartment through different
outlets.
1.
Vent - In this position, air is discharged from
the upper air outlet. Air quantity is controlled
by the fan control knob.
2.
Bi-Level - In this position, air flow is divided
between the upper air outlets and the foot air
outlets, with warmer air delivered to the floor
outlets than the air delivered to the upper air
outlets.
3.
Foot - In this position, air flow is delivered to
the foot while sending approx. 30% of total
amount of air to the windshield
4.
Def/Foot - In this position, air flow is delivered
to the foot, while sending approx. 40% of total
amount of air to the windshield.
5.
Defrost - In this position, most of the air is
delivered to the windshield and a small
amount is delivered to the side windows.
Moving the air source select lever to the “CIRC”
position provides quickest heat delivery by closing
the blower assembly mode door. In this position,
outside air is not delivered to the passenger
compartment.
AIR SOURCE SELECT LEVER
The intake of outside air and the circulation of inside
air are controlled by sliding this lever left or right.
FAN CONTROL KNOB
This knob controls the blower motor speed to
regulate the amount of air delivered to the defrost,
foot, and ventilation ducts:
1.
Low
2.
Medium Low
3.
Medium High
4.
High
TEMPERATURE CONTROL KNOB
When the temperature control knob is in the
“COLD” position, the air mix door closes to block
the flow of air to the heater core.
When the temperature control knob is in the
“HOT” position, the air mix door opens to allow air
to pass through the heater core and heat the
passenger compartment.
Placing the knob in an intermediate position will
cause a lesser or greater amount of air to reach the
heater core. In this mode the passenger compart-
ment temperature can be regulated.
Heater core
Heater unit
TO VENT OUTLET
Air mix door
VENT MODE
TO FOOT
TO VENT OUTLET
BI-LEVEL MODE
FOOT MODE
TO FOOT OUTLET
TO DEF OUTLET(LHD)
DEF/FOOT MODE
TO FOOT OUTLET
TO DEF OUTLET
DEF MODE
TO DEF OUTLET
: COLD AIR
: HOT AIR
: TEMP.CONTROLLED AIR
Full hot switch
Ceramic heater
Heater unit
HEATING AND VENTILATION 1A – 5
CERAMIC HEATER
When the fan control knob (fan switch) turns on with the temperature control knob set to “FULL HOT” (full
hot switch “ON”), the ceramic heater in the heater unit gets hot, thus causing the heater blow temperature
of diesel vehicle to get high to improve the heating performance (Since the engine coolant temperature of
diesel vehicle is low, its blow temperature is also low.).
Glow plug
Full hot switch
Fan switch
Thermo switch
Less than 80°C (177.8°F)
CERAMIC HEATER
“ON”
CERAMIC HEATER
“OFF”
OFF
ON
OFF
OFF
OFF
ON
ON
ON
This illustration is based on RHD
1A – 6 HEATING AND VENTILATION
ON-VEHICLE SERVICE
HEATER UNIT
4a
5
3
4
2
6
9
8
7
1
Electro thermo connector (With A/C)
Resistor
Removal Steps
1. Instrument panel assembly
2. Water hose
3. Resistor connector
4. Duct
4a. Evaporator assembly (A/C only)
5. Instrument panel center bracket
6. Rear heater duct
7. Heater unit
8. Lap vent nozzle
9. Center ventilation lower duct
Installation Steps
To install, follow the removal steps in the
reverse order
This illustration is based on LHD
HEATING AND VENTILATION 1A – 7
INSTALLATION
To install, follow the removal steps in the reverse order,
noting the following points:
1. When handling the ECM and the control unit, be
careful not to make any improper connection of the
connectors.
2. Adjust control lever assembly cables.
Refer to “CONTROL LEVER ASSEMBLY” installation
steps in this section.
3. When installing the heater unit, defroster nozzle and
center vent duct, be sure that proper seal is made,
without any gap between then.
REMOVAL
Preparation:
•
Disconnect the battery ground cable
•
Drain engine coolant
•
Discharge and recover refrigerant (W/A/C)
(Refer to Section 1B “REFRIGERANT RECOVERY”)
1. Instrument Panel Assembly
Refer to Section 10 “BODY” for INSTRUMENT PANEL
ASSEMBLY removal procedure.
2. Water Hose
Disconnect water hoses at heater unit.
3. Resistor Connector
4. Duct
4a. Evaporator Assembly
Refer to Section 1B “AIR CONDITIONING” for
Evaporator Assembly removal procedure.
5. Instrument panel center bracket
6. Rear Heater Duct
7. Heater Unit
8. Lap vent nozzle
9. Center ventilation lower duct
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