heater LAND ROVER DISCOVERY 1995 Owner's Guide

CHASSIS AND BODY
21
REPAIR REAR DOOR GLASS
Service repair no - 76.31.21
Remove
1.Remove the spare wheel from the rear door.
2.Remove the rear door wiper arm.
See WIPERS
AND WASHERS, Repair, wiper arm - rear
window.
3.If the glass is fitted, disconnect the heater leads
from the terminals, push out the glass and
remove the mounting rubber.Refit
4.Thoroughly clean the opening to be glazed.
5.Clean the glass and fit the mounting rubber,
ensuring that the glass sits correctly in the
groove.
6.Fit a draw cord around the exterior of the
mounting rubber with the tails of the cord
situated on the top corner of the bend at the
bottom of the glass.
7.To aid assembly, coat the glass opening in the
door with liquid soap.
8.Position the assembled glass and rubber
mounting to the opening, with the tails of the
draw cord fed into the interior of the vehicle.
9.With assistance from a second operator, pushing
the glass and mounting rubber into the opening,
pull the draw cord from the mounting rubber
enabling the seal to ride up over the retaining
flange.
10.Connect the heater leads to the terminals on the
glass.

76CHASSIS AND BODY
46
REPAIR DASH PANEL CENTRAL LOUVRE PANEL
Service repair no - 76.46.42
Remove
1.Disconnect battery negative lead.
2.Remove radio.
See ELECTRICAL, Repair,
radio.
3.Release tags securing radio cage to louvre
panel and remove cage.
4.Remove clock.
See ELECTRICAL, Repair,
clock.
5.Release 4 coin tray securing tags.
6.Remove coin tray.
7.Remove 3 heater control and blower switch
knob.
8.Remove 2 screws securing heater graphic
display panel and remove panel.
9.Remove 4 screws securing heater control unit to
panel.
10.Working through coin tray aperture, remove
screw securing panel.
11.Working through clock aperture, remove screw
securing panel.
12.Loosen 2 uppermost panel retaining screws.
NOTE: On some models the panel is fitted
with an LED. In this case, manoeuvre LED
from panel and disconnect.
13.Remove panel retaining screw cover.

CHASSIS AND BODY
47
REPAIR
14.Remove 2 screws securing louvre panel.
15.Remove louvre panel from dash panel.
Refit
16.Position louvre panel, feed harness connectors
through their correct apertures,and align to dash
panel.
CAUTION: When refitting avoid trapping of
electrical wiring.
17.Fit and tighten screws securing louvre panel.
18.Fit panel retaining screw cover.
19.Position heater control unit to panel and secure
with screws.
20.Fit heater graphic display panel and secure with
screws.
21.Fit heater control and blower switch knobs.
22.Fit clock.
See ELECTRICAL, Repair, clock.
23.Position coin tray and secure to tags.
24.Position radio cage, feed electrical connectors
and aerial through cage, and position to panel.
25.Bend back radio cage retaining tags.
26.Fit radio.
See ELECTRICAL, Repair, radio.
27.Connect battery negative lead.DASH PANEL ASSEMBLY
Service repair no - 76.46.23
Remove
1.Move front seats to rearmost position.
2.Disconnect battery negative lead.
3.Disconnect air bag multiplugs under dash panel.
CAUTION: When air bags are fitted,
reference must be made to the Airbag
Supplementary Restraint System section.
4.Remove passenger glove box.
5.Remove driver's side access panel.
6.Remove centre console assembly.
See centre
console.
7.Remove airbag from steering wheel.See
SUPPLEMENTARY RESTRAINT SYSTEM,
Repair, driver's airbag module.
8.Remove passenger's airbag from dash panel.
See SUPPLEMENTARY RESTRAINT SYSTEM,
Repair, passenger's airbag module.
9.Release clamp and lower steering column.
10.Remove steering wheel.
See STEERING,
Repair, steering wheel.
11.Remove column switch.See
SUPPLEMENTARY RESTRAINT SYSTEM,
Repair, column switch assembly.
12.Remove instrument binnacle.See
ELECTRICAL, Repair, instrument binnacle.
13.Remove radio.See ELECTRICAL, Repair,
radio.
14.Remove exterior mirrors switch panel.
15.Remove coin tray.
16.Remove switch panel.
17.Remove clock.
18.Undo screw securing mounting bracket and
position passenger's side relay assembly aside.
19.Set heater controls fully clockwise.

76CHASSIS AND BODY
48
REPAIR 20.Note position of levers, disconnect heater control
cables from levers and outer cable from retaining
clips.
21.Remove 4 bolts securing dash panel to centre
lower mounting brackets.
22.Remove 4 bolts securing dash panel to side
lower mounting brackets.
23.Undo 4 screws and remove 2 driver's knee
bolster pads from below steering column.
24.Remove 4 nuts securing instrument mounting
bracket to dash panel.
25. With assistance:Manoeuvre dash panel
partially rearward.
26.Driver's side: Disconnect 6 multiplugs
connecting dash harness to main harness.
27.Disconnect 3 multiplugs connecting dash
harness to fusebox.
28. With assistance:Lift dash panel rearward to
clear fixings and remove from vehicle.

HEATING AND VENTILATION
1
DESCRIPTION AND OPERATION HEATING AND VENTILATION UNIT
The heating and ventilation and blower units are
standard on all models. Air conditioning system is an
optional module, which when fitted provides fully
integrated climate control for the vehicle interior.
The heating and ventilation unit controls the air
distribution and heating to the vehicle interior. The
blower unit controls the volume of air supplied, while
the air conditioning module (when fitted) provides
refrigerated and dehumidified air.
1. Fresh air inlet
2. Recirculation air inlet
3. Air outlets screen de-mist
4. Air outlet face level vents
5. Air outlets front footwells
6. Air outlets to rear footwells7. Fresh/recirculation air flap servo
8. Blower motor relay
9. Multiplug connector to main harness
10. Multiplug connector, blower to heater unit
11. Resistor unit - blower speed.

80HEATING AND VENTILATION
2
DESCRIPTION AND OPERATION Through-flow ventilation
Through-flow ventilation is achieved by means of
one-way air extraction vents incorporated in both rear
quarter body panels. The vents open and close
automatically dependent upon the heating and
ventilation unit control settings and the volume of air
entering the vehicle.Heating and ventilation unit, controls
The Heating and Ventilation Unit is centrally located
and concealed by the dash assembly. When air
conditioning is fitted, an evaporator is mounted in the
heater unit forward of the heater matrix.
The dash mounted central controls are used to
operate both systems. A single switch controls the air
conditioning unit when fitted.
Controls set for maximum heat to footwells and face level vents
Heating and ventilation flaps and air flow key
1. Fresh or recirculated air from blower unit
2. Evaporator matrix - air conditioning (when fitted)
3. Heater matrix
4. Air outlet front footwells
5. Air outlet to rear footwells
6. Air outlet face level vents7. Air outlets screen de-mist
8. Control flap - face level vents
9. Control flap - demist vents
10. Control flap - air direction
11. Control flap - air temperature
12. Control flap - air direction

HEATING AND VENTILATION
3
DESCRIPTION AND OPERATION
Controls set for unheated air to footwells and face level vents
Heater and ventilation operation
The heating and ventilation system contains a heater
matrix, which is connected to the engine cooling
system, and a 4 speed fan for air distribution. Engine
coolant is circulated through the heater matrix
continuously, except when the temperature controls
are set to COLD.
Recirculated air
When the recirculation switch is pressed, an electrical
servo operates and fully closes the fresh air intake
flap.
Fresh air
When the recirculation switch is returned to the OFF
position, the electrical servo returns and fully opens
the fresh air intake flap.Heated air
Temperature output is controlled by the temperature
controls which move the air direction and temperature
flaps independently to increase or decrease the
volume of air flow through the heater matrix.
V8 Engine:When both controls are in the cold
position, the coolant valve is turned off.
Face level vent flap
Control at face level, flap fully open. All other vents
closed.
Control at face and foot level, flaps half open.
Unless an air conditioning unit is fitted, only fresh or
re-circulated air is available from the face level vents.
Demist vent flap
Control at demist, flap fully open. All other vents
closed.
Control at demist and foot level, flaps half open.

80HEATING AND VENTILATION
4
DESCRIPTION AND OPERATION Air direction flap
Flap moves across mixing chamber to direct the air
flow away from the heater matrix.
Air temperature flap
Control at HOT, flaps fully closed. All air flow passes
through heater matrix. As control is moved towards
COLD the flaps progressively open directing air flow
away from the heater matrix.
Control at COLD, flaps fully open.
V8 Engine:When both controls are at COLD, 2
micro-switches are closed and operate a vacuum
valve which closes the coolant valve.Air conditioning
When an air conditioning unit is fitted, the mechanical
operation of the heater controls remains unaltered.
However the air conditioning evaporator is positioned
in front of the mixing chamber through which all air
flow passes.

HEATING AND VENTILATION
1
FAULT DIAGNOSIS HEATER OUTPUT
Symptom:-
Heater emits cold air.
1.Engine running: Check coolant valve opens as a
temperature control is moved from COLD.
2.Check for engine running cold.
See COOLING
SYSTEM, Fault diagnosis, Engine Runs Cold
3.Check heater pipes and hoses for blockage or
restriction.
4.Check heater matrix for blockage or restriction,
flush system.
Heater emits warm air.
5. Engine running:Check coolant valve closes
when both temperature controls are moved to
COLD.

HEATING AND VENTILATION
1
REPAIR HEATER BLOWER SWITCH AND ILLUMINATION
BULB
Service repair no - 80.10.22 - Switch
Service repair no - 86.48.73 - Bulb
Remove
1.Pull 3 knobs from rotary controls.
2.Pull knob from blower switch.
3.Remove 2 screws retaining graphics panel.
4.Remove graphics plate.
5.Remove capless bulb.
6.Remove 4 screws retaining switch.
7.Remove switch panel. Use plastic tube to assist
removal.
Blower switch
8.Pull blower switch from rear of panel.
9.Disconnect multiplug and remove blower switch.
Refit
10.Reverse removal procedure.HEATER CONTROL UNIT
Service repair no - 80.10.42.
Remove
1.Disconnect battery negative lead.
2.Pull 3 knobs from rotary controls.
3.Pull knob from blower switch.
4.Remove 2 retaining screws and remove
graphics panel.
5.Remove 4 screws retaining switch.
6.Remove switch panel.
7.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