Defender 90 NAS. Manual — part 86
80
HEATING AND VENTILATION
2
DESCRIPTION AND OPERATION
HEATER OPERATION
The heater matrix, located in the distribution unit, is
connected to the engine cooling system. As coolant is
circulated continuously through the matrix, a selection
of heated or ambient air is controlled by two flaps
within the distribution unit.The temperature flap
controls the amount of ambient air to the heater
matrix, air being supplied
through a ducted vent on top of the vehicle front wing
to the blower motor (volute) housing. The blower
motor can be used to boost the air flow into the
distribution unit. The air flap controls the supply of
heated or ambient air from the heater unit into a
plenum chamber integeral with the vehicle fascia. Two
flaps in the plenum chamber (heater duct) distribute
the air flow to either the footwell vents or windscreen
demister vents.
Non air conditioning fascia shown
Heater controls
1. Temperature control
Move the lever downwards to increase air
temperature or up to decrease air temperature.
2. Air distribution control
Lever fully up - windscreen vents only.
Lever midway - footwell and windscreen vents.
Lever fully down - footwell vents.
3. Blower motor fan speed control
Move the lever progressively downwards to increase
fan speed. With the control at ’O’ the fan is switched
off and the volume of air entering the passenger
compartment is solely dependent on ram effect when
the vehicle is moving forward.
HEATING AND VENTILATION
3
DESCRIPTION AND OPERATION
Fresh air vents
Two fresh air vents are fitted in the windscreen frame
and are controlled independently of the vehicle
heating system. Each vent is operated separately.
To open a vent, push the lever to the right and then to
the required position.
HEATING AND VENTILATION
1
REPAIR
HEATER UNIT
Service repair no - 80.20.01
Remove
1. Remove bonnet and disconnect battery.
2. Remove radiator bottom hose at radiator union
and drain cooling system.
See COOLING
SYSTEM, Adjustment, Drain and refill
3. Slacken clips and disconnect heater hoses at
heater box unions.
4. Remove outer cable securing clips.
5. Slacken trunnions and disconnect control cables
from heater vent flap levers.
6. Remove heater wiring harness securing loop.
7. Disconnect harness multi-plug.
8. Remove interior bulkhead trim.
9. Remove lower nuts and bolts securing the
heater unit to the bulkhead. If air conditioning is
fitted, remove evaporator.
See AIR
CONDITIONING, Repair, Evaporator
10. Slacken heater unit upper retaining bolts.
11. Manoeuvre heater unit, complete with blower
motor, clear of air inlet duct and remove from
engine compartment.
12. Remove sealing rubber.
For heater matrix removal.
See Heater matrix
For blower motor removal.
See Blower motor
Refit
13. Smear a NEW sealing rubber with a suitable
impact adhesive and fit to heater unit.
14. Manoeuvre heater unit into position in engine
compartment, fit blower motor to air inlet duct
and locate upper fixing bolts.
15. Loosely fit lower fixing bolts to heater unit .
16. Fully tighten upper fixing bolts followed by the
lower fixings.
17. Refit interior bulkhead trim.
18. Secure wiring harness and reconnect multi-plug.
19. Fit control cables to vent flap trunnions and
secure with outer cable clips.
20. Connect heater hoses.
21. Fit radiator bottom hose and refill cooling
system.
See COOLING SYSTEM, Adjustment,
Drain and refill
22. If air conditioning is installed, fit evaporator.
See
AIR CONDITIONING, Repair, Evaporator
23. Fit bonnet and reconnect battery.
80
HEATING AND VENTILATION
2
REPAIR
BLOWER MOTOR
Service repair no - 80.20.15
Remove
1. Remove heater unit.
See Heater unit
2. Remove 3 nuts securing angled bracket to
heater unit. Pivot bracket to remove from studs.
3. Remove 5 nuts securing blower motor assembly
to volute housing.
4. Disconnect harness connector and remove
blower motor from volute housing.
5. Release circlip and withdraw impeller from motor
drive shaft.
6. Remove 3 nuts securing blower motor to
mounting plate.
7. Remove blower motor.
8. Examine components for signs of wear and
renew as necessary.
Refit
9. Apply Bostik 1261 adhesive to mating faces of
mounting plate and blower motor.
10. Fit blower motor to mounting plate and secure
with nuts. Ensure rubber mountings are correctly
fitted.
11. Fit impeller to motor drive shaft and secure with
circlip.
12. Position blower motor assembly in volute
housing and secure with nuts. Fit angled bracket
to lower fixing.
13. Reconnect harness plug to resistor harness and
fit angled bracket to heater unit.
14. Fit heater unit.
See Heater unit
HEATER MATRIX
Service repair no - 80.20.29
Remove
1. Remove heater unit.
See Heater unit
2. Remove 3 nuts securing angled bracket to
heater unit. Pivot bracket to remove from studs.
3. Remove 14 screws and detach 2 matrix retaining
plates from heater unit base.
4. Remove 9 screws securing matrix top retaining
plate.
5. Withdraw heater matrix through top of heater
unit casing.
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