1995 LAND ROVER DISCOVERY Workshop Manual

HEATING AND VENTILATION
3
REPAIR Air direction
3.Set control fully clockwise
4.Release outer cable from 2 clips on unit.
5.Release cable from stud on flap lever.
6.Remove control cable from control lever.
Temperature
7.Set RH control fully clockwise, LH control fully
anti-clockwise
8.Release outer cable from 2 clips on unit.
9.Release cable from stud on flap lever.
10.Remove control cable from control lever.
Refit
11.Reverse removal procedure. Check the
satisfactory function of the controls before fitting
louvre vent panel.RESISTOR UNIT
Service repair no - 80.20.17
Remove
1.Open glove box, manoeuvre side springs
through cut-outs and lower lid.
2.Remove 2 screws securing resistor unit to
trunking.
3.Disconnect multiplug and remove resistor unit.
Refit
4.Reverse removal procedure.

80HEATING AND VENTILATION
4
REPAIR WATER VALVE
Service repair no - 80.10.16
Remove
1.Disconnect vacuum pipe from water valve.
2.Slacken 4 clips securing hoses to water valve.
3.Use a thin blade to break seal between hoses
and nozzles
4.Disconnect heater inlet hose from valve.
NOTE: A quantity of coolant will be
released.
5.Disconnect heater outlet hose from valve.
6.Lever valve from coolant pipe hoses.
Refit
7.Reverse removal procedure. Lightly lubricate
water valve nozzles with petroleum jelly.
8.Reverse removal procedure. Top-up engine
coolantVACUUM SWITCH - WATER VALVE
Service repair no - 80.10.36
Remove
1.Release emission pipe from retaining clip.
2.Remove bolt securing switch to bulkhead.
3.Disconnect multiplug from switch.
4.Disconnect 2 vacuum pipes and remove vacuum
switch.
Refit
5.Reverse removal procedure.

HEATING AND VENTILATION
5
REPAIR RECIRCULATION SWITCH
Service repair no - 80.10.27
Remove
1.Release fascia centre louvre vent panel from its
fitted position to gain access to rear of panel.
See CHASSIS AND BODY, Repair, Dash
Panel Central Louvre Panel
2.Disconnect multiplug from switch
3.From the rear, push switch out of panel.
Refit
4.Reverse removal procedure.RECIRCULATION FLAP SOLENOID
Service repair no - 80.10.43
Remove
1.Open glove box, manoeuvre side springs
through cut-outs and lower lid.
2.Remove 2 locknuts securing cruise control ECU
to bracket.
3.Position cruise control ECU aside.
4.Remove 2 screws securing recirculation
solenoid to casing.
5.Release solenoid from lever.
6.Disconnect multiplug and remove solenoid.
Refit
7.Reverse removal procedure.

80HEATING AND VENTILATION
6
REPAIR BLOWER MOTOR UNIT - HEATER AND AIR
CONDITIONING
Service repair no - 80.20.17
Service repair no - 82.25.54.
Remove
1.Move seats to rear most position.
2.Disconnect battery negative lead.
3.Remove fascia panel assembly.
See CHASSIS
AND BODY, Repair, Dash Panel Assembly
4.Remove 2 nuts securing lower brackets to
toeboard.
5.Manoeuvre blower unit from heater unit and
remove.
Refit
6.Reverse removal procedure. Ensure seal
between blower and heater unit is tight.BLOWER MOTOR
Service repair no - 80.20.17
Service repair no - 82.25.33.
Remove
1.Remove blower motor unit.
See Blower Motor
Unit - Heater and Air Conditioning
2.Release wiring harness retaining clip.
3.Remove 3 screws securing casing.
4.Remove blower motor assembly.

HEATING AND VENTILATION
7
REPAIR
5.Remove fan retaining clip.
6.Remove fan.
7.Remove 2 screws securing motor to casing.
8.Remove blower motor.
Refit
9.Reverse removal procedure.HEATER MATRIX
Service repair no - 80.20.29
Remove
1.Remove heater unit.
See AIR CONDITIONING,
Repair, Heater and Cooler Unit
2.Remove evaporator.See AIR CONDITIONING,
Repair, Evaporator and Expansion Valve
3.Remove 2 screws and remove RH side footwell
outlet.
4.Remove heater pipe clips.
5.Slide heater matrix from casing.
6.Release 2 clips and remove 2 heater pipes from
matrix.
Refit
7.Reverse removal procedure.

HEATING AND VENTILATION
1
SPECIFICATIONS, TORQUE TORQUE VALUES
NOTE: Torque wrenches should be regularly checked for accuracy to ensure that all fixings are
tightened to the correct torque.
Nm
METRIC
M5 6......................................................................................................
M6 9......................................................................................................
M8 25.....................................................................................................
M10 45...................................................................................................
M12 90...................................................................................................
M14 105..................................................................................................
M16 180..................................................................................................
UNC / UNF
1/4 9......................................................................................................
5/16 24...................................................................................................
3/8 39.....................................................................................................
7/16 78...................................................................................................
1/2 90.....................................................................................................
5/8 136....................................................................................................
Torque values above apply to all screws and bolts used unless otherwise specified.

AIR CONDITIONING
1
DESCRIPTION AND OPERATION AIR CONDITIONING SYSTEM COMPONENTS
1. Compressor
2. Condenser
3. Receiver/drier
4. Evaporator
5. High pressure servicing connection6. Low pressure servicing connection
7. Dual pressure switch
8. Sight glass
9. Rear evaporator/blower motor assembly

82AIR CONDITIONING
2
DESCRIPTION AND OPERATION SCHEMATIC LAYOUT OF THE AIR CONDITIONING
SYSTEM
1. Compressor
2. Condenser
3. Receiver/drier
4. Thermostatic expansion valve
5. Evaporator
6. Capillary tube
7. Dual pressure switch
8. Cooling fans to maintain air flow
9. Compressor high pressure relief valve
10. Sight glass - refrigerant
11. Drying agent - receiver/drier
12. Blower motorA1 Ambient air flow through condenser
A2 Ambient air flow through fan and evaporator
A3 Cooled air flow to vehicle interior
F1 High pressure high temperature refrigerant
vapour
F2 High pressure slightly subcooled refrigerant
liquid
F3 High pressure slightly subcooled refrigerant
liquid with moisture, vapour bubbles and foreign
matter removed
F4 Low pressure low temperature mixed liquid and
vapour
F5 Low pressure slightly super heated refrigerant
vapour