1995 LAND ROVER DISCOVERY heating

80HEATING AND VENTILATION
2
REPAIR 8.Disconnect 4 multiplugs and position harness
aside.
NOTE:Do not carry out further
dismantling if component is removed for
access only.
9. Fan speed switch:remove fan speed switch
slide and push out fan speed switch.
10.Pull out light bulb disconnect terminals and
remove fan speed light strip.
11.Unclip 3 heater control cables from control unit.
12. Microswitch:Unclip 3 micro switches.
13.Cut cable tie and release wiring harness from
control unit.
14.Remove heater control unit.
Refit
15.Reverse removal procedure. Check the
satisfactory function of the controls before fitting
louvre vent panel.CONTROL CABLES
Service repair no - 80.10.06 - Air flow
Service repair no - 80.10.25 - Temperature control
RH
Service repair no - 80.10.26 - Temperature control
LH
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.Open glove box, manoeuvre side springs
through cut-outs and lower lid.

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
3
DESCRIPTION AND OPERATION AIR CONDITIONING SYSTEM OPERATION
The air conditioning system provides the means of
supplying cooled and dehumidified, fresh or
recirculated air to the interior of the vehicle. The
cooling effect is obtained by blowing air through the
matrix of an evaporator unit and when required,
mixing that air with heated air by means of the heater
distribution and blend unit, to provide the conditions
required inside the vehicle. The volume of conditioned
air being supplied is controlled by a variable speed
blower.
A sealed system, charged with Refrigerant R134a,
together with a blower unit, blend unit and control
system combine to achieve the cooled air condition.
For air conditioning air distribution system.
See
HEATING AND VENTILATION, Description and
operation, Heating and ventilation unit
The air conditioning system comprises five major
units:
1.An engine-mounted compressor.
2.A condenser mounted in front of the radiator.
3.A receiver/drier unit located in front of the
condenser.
4.Thermostatic expansion valve mounted above
the evaporator.
5.An evaporator unit mounted in front of the heater
matrix.
NOTE: Vehicles fitted with rear air
conditioning have an additional
evaporator/blower motor assembly located
behind the LH rear compartment lower trim panel.
These units are interconnected by hoses and pipes
carrying Refrigerant R134a, the evaporator is linked
into the vehicle ventilation system.
Refrigeration cycle
1. Compressor
The compressor (1), belt driven from the crankshaft
pulley, pressurises and circulates the refrigerant
through the system. Mounted on the compressor, an
electro-mechanical clutch maintains the correct
temperature and pressure by engaging or disengaging
to support the system's requirements. The clutch
action is normally controlled by a thermostat located
at the evaporator (5). The compressor is of the
swashplate type having fixed displacement.Should the temperature at the evaporator (5) fall low
enough for ice to begin to form on the fins, the
thermostat disengages the clutch and also isolates the
cooling fans relays. When the temperature at the
evaporator (5) rises to the control temperature, the
clutch is re-engaged.
Should the system pressure become excessive or
drop sufficiently to cause damage to the compressor
(1) a dual pressure switch (7), located in the high
pressure line, signals the relay unit to disengage the
clutch. The compressor also has an emergency high
pressure relief valve (9) fitted.
The cooling fans are controlled by engine temperature
when the air conditioning is not switched on.
2. Condenser
From the compressor, hot high pressure vaporised
refrigerant (F1) passes to the condenser (2), which is
mounted in front of the engine coolant radiator. Ram
air(A1) passing through the condenser (2),
supplemented by 2 cooling fans (8) mounted in front
of the condenser, cools the refrigerant vapour
sufficiently to form a high pressure slightly subcooled
liquid (F2).
3. Receiver/drier
This liquid then passes to a receiver/drier (3) which
fulfils two functions. It acts as a reservoir and moisture
extractor (11).
A sight glass (10), in the high pressure line, provides a
method of determining the state of the refrigerant
without breaking into the system.
4. Expansion valve
From the receiver/drier (3) the moisture free high
pressure liquid refrigerant (F3) passes through a
thermostatic expansion valve (4). A severe pressure
drop occurs across the valve and as the refrigerant
enters the evaporator space at a temperature of
approximately -5°C it boils and vaporises.