air conditioning MERCEDES-BENZ SPRINTER 2006 Owner's Manual

(30) Disconnect the engine valley drain hose fas-
tener from the transmission (Fig. 5).
(31) Remove the steering gear mounting bolts.
(32) Disconnect the transmission cooler lines at
transmission and oil pan.
(33) Remove the torque converter access plate.
(34) Remove the torque converter bolts.
(35) Remove the crank position sensor.
(36) Remove the transmission housing to engine
mounting bolts.
(37) Remove the starter mounting bolts (Fig. 5).
(38) Support the transmission with a transmission
jack.
(39) Place a wood block between the transmission
housing and the front frame cross over.
(40) Remove the transmission jack.
(41) Remove the exhaust bracket (right side).
(42) Remove the engine ground strap (left side).
(43) Lower the vehicle.
(44) Remove the heater housing filter and lower
housing.(45) Connect the engine lifting fixture #9308 to the
engine lifting eyes.
(46) Remove the engine mount bolts.
(47) Remove the transmission oil level indicator
tube mounting bolt.
Fig. 5 2.7L CDI ENGINE
1 - INTAKE MANIFOLD 5 - FUEL FILTER
2 - ENGINE VALLEY DRAIN HOSE 6 - AIR CONDITIONING COMPRESSOR
3 - STARTER 7 - POWER STEERING PUMP
4 - ENGINE OIL LEVEL SENSOR 8 - EGR VALVE
9 - 8 ENGINEVA

NOTE: After removing the front cross plate, seal
metal with anti corrosion protection.
(48) Using tin snips, remove the front cross plate
at the cutting edges and deburr (Fig. 6).
(49) Connect and engine hoist and carefully lift
engine assembly from engine bay area (Fig. 7).
INSTALLATION
INSTALLATION - ENGINE COVER
CAUTION: Care must be taken when installing the
engine cover. Assure the proper routing of the fuel
injector return fuel hose to the banjo bolt fitting in
the left rear corner of the cover. Failure to do so
may pinch or damage the hose causing fuel leakage
or a driveability concern.
(1) Align cover and install screws. tighten screws
to 11N´m (97 lbs. in.) (Fig. 2).
INSTALLATION
NOTE: Deburr and seal metal from cross plate
removal with anti corrosion material.
NOTE: Replace the air conditioning drier any time
the air conditioning system is opened to the atmo-
sphere.
(1) Install the engine lifting fixture, special tool #
9308 to the engine lifting eyelets.
(2) Attach the engine hoist.
(3) Install the engine assembly into the vehicle
engine compartment, mating the transmission and
the engine.
(4) Lower the engine assembly until the engine
brackets align with the mounts.
(5) Hand start the engine mount bolts and remove
the engine lifting devise.
(6) Tighten the engine mount bolts to 83 N´m (62
lbs.ft.).
(7) Raise and support the vehicle.
(8) Install the transmission housing to engine
bolts. Refer to (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - NAG1 - INSTALLA-
TION) for correct sequence and torque specification.
(9) Install the torque converter bolts. Refer to
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTO-
MATIC - NAG1 - INSTALLATION) for correct
sequence and torque specification.
(10) Install the crank sensor (Fig. 8).
Fig. 6 FRONT CROSS PLATE
1 - CUTTING POINT
2 - CORE SUPPORT
Fig. 7 ENGINE HOIST CONNECTION
1 - ENGINE HOIST
2 - CENTER EYELET OF ENGINE LIFTING FIXTURE
3 - ENGINE LIFTING FIXTURE #9308
VAENGINE 9 - 9

(11) Install the torque converter access plate. Refer
to (Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - NAG1 - INSTALLATION) for correct
sequence and torque specification.
(12) Install the transmission cooler lines to trans-
mission. (Refer to 21 - TRANSMISSION/TRANS-
AXLE/AUTOMATIC - NAG1 - INSTALLATION) for
correct sequence and torque specification.
(13) Connect the engine valley drain hose to the
transmission (Fig. 5).
(14) Install transmission electrical connector and
shifter hardware. Refer to (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - NAG1 - INSTAL-
LATION) for correct sequence and torque
specification.
(15) Install the steering gear and tighten in two
stages. 25 N´m (18.5 lbs. ft.), then 45 N´m (33 lbs. ft.)
plus 90É.
(16) Install the starter.
(17) Connect the ground strap (left side).
(18) Align and install the exhaust and bracket
(Refer to 11 - EXHAUST SYSTEM/EXHAUST PIPE -
INSTALLATION).
(19) Lower the vehicle.
(20) Install the lower heater housing and filter.
(21) Install the air inlet hose, CCV breather and
CCV heater at the turbocharger (Fig. 4).
(22) Connect the coolant supply and return hoses.
(23) Connect the brake booster vacuum hose at the
vacuum pump.(24) Connect the fuel lines at the filter assembly
(Fig. 9).
(25) Connect the power steering hoses.
(26) Install the radiator/charge air cooler and
hose(s) assemblies (Refer to 7 - COOLING/ENGINE/
RADIATOR - INSTALLATION).
(27) Install A/C condenser and fan assemblies Con-
nect the fan harness connector.
(28) Connect the refrigerant lines.
(29) Install a air conditioning receiver/drier (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMB-
ING/RECEIVER / DRIER - INSTALLATION).
(30) Connect the upper and lower radiator hoses.
(31) Connect the transmission lines at the radia-
tor.
(32) Install air cleaner housing and connect the air
inlet duct and air flow sensor.
(33) Connect the charge air cooler hose at intake
manifold. (Refer to 9 - ENGINE/AIR INTAKE SYS-
TEM/AIR CLEANER HOUSING - INSTALLATION).
(34) Route the engine wiring harness inside the
vehicle and connect.
(35) Install the turbocharger heat shield.
(36) Install the front grille and fascia assembly.
(37) Connect the negative battery cable.
(38) Check and fill engine oil (Refer to LUBRICA-
TION & MAINTENANCE/FLUID TYPES - SPECIFI-
CATIONS).
Fig. 8 CRANKSHAFT POSITION SENSOR
1 - ENGINE BLOCK
2 - WIRING HARNESS CONNECTOR
3 - CRANKSHAFT POSITION SENSOR
4 - STARTER SOLENOID
Fig. 9 FUEL FILTER
1 - FUEL SUPPLY FROM TANK
2 - FUEL SUPPLY TO HIGH PRESSURE PUMP
3 - POWER STEERING RESERVOIR
4 - FUEL FILTER
5 - OIL FILTER
6 - WATER IN FUEL SENSOR
9 - 10 ENGINEVA

(39) Fill cooling system to proper level with the
appropriate coolant.
(40) Evacuate and recharge air conditioning.
(41) Check and refill all ancillary system fluid lev-
els.(42) Start engine and inspect for leaks (Refer to 14
- FUEL SYSTEM - WARNING).
SPECIFICATIONS - TORQUE SPECIFICATIONS
2.7L DIESEL
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Crankcase Ventilation
Screw-Air Charge Distri-
bution Pipe to Air Charge
Distribution Panel11 - 9 7
Cylinder Head
8m-Bolt- Cylinder Head to
Timing Case Cover20 15 -
Bolt-Front Cover to Cylin-
der Head14 - 124
12m-Bolt-Cylinder Head
to Crankcase (3 stages,
torque, torque angle,
torque angle)60, 90É, 90É 44, 90É,90É -
Crankcase, Timing Case
Cover, End Cover
Bolt-Crankshaft Bearing
Cap to Crankcase (2
stages, torque, torque an-
gle)55, 90É 40, 90É -
Bolt-End Cover to Crank-
case9-80
Bolt-Timing Case Cover
to Crankcase20 15 -
Plug-Coolant Drain to
Crankcase30 22 -
Oil Pan
6m-Bolt-Oil Pan to Crank-
case9-80
8m-Bolt-Oil Pan to Crank-
case20 15 -
Bolt-Oil Pan to End Cover 9 - 80
Bolt-Oil Pan to Timing
Case Cover9-80
Bolt-Oil Pan to Transmis-
sion Bell Housing40 30 -
Plug-Oil Pan to Oil Drain 47 35 -
Connecting Rod
VAENGINE 9 - 11

(8) Install the exhaust hanger fasteners at the
muffler.
(9) Tighten the exhaust hanger bracket to engine
block.
(10) Install the turbocharger support bracket.
(11) Lower the vehicle.
(12) Install the air cleaner duct to the turbo-
charger (Fig. 71).
(13) Install the exhaust heat shield.
(14) Connect the negative battery cable.
TIMING CHAIN COVER
REMOVAL
WARNING: DO NOT OPEN COOLING SYSTEM
UNLESS TEMPERATURE IS BELOW 90ÉC (194ÉF).
OPEN CAP SLOWLY TO RELEASE PRESSURE.
STORE COOLANT IN APPROVED CONTAINER
ONLY. RISK OF INJURY TO SKIN AND EYES FROM
SCALDING COOLANT. WEAR PROTECTIVE
GLOVES, CLOTHING AND EYE WEAR.
(1) Disconnect negative battery cable.
NOTE: Rotate engine on crankshaft. DO NOT crank
the engine at the bolt of the camshaft sprocket.
NOTE: DO NOT crank engine back.
(2) Position piston of cylinder 1 to ignition TDC.
Markings on the camshaft bearing cap must be
aligned.
(3) Drain coolant (Refer to 7 - COOLING/ENGINE/
COOLANT - STANDARD PROCEDURE).
(4) Install retaining lock for crankshaft/starter
ring gear (Refer to 9 - ENGINE/ENGINE BLOCK/
FLEX PLATE - INSTALLATION).
(5) Drain engine oil.
(6) Remove the oil filter to allow the oil to flow off
into the oil pan.
(7) Remove the radiator assembly (Refer to 7 -
COOLING/ENGINE/RADIATOR - REMOVAL).
(8) Remove engine cover (Refer to 9 - ENGINE -
REMOVAL).
(9) Remove front cover at cylinder head (Refer to 9
- ENGINE/CYLINDER HEAD - REMOVAL).
(10) Remove accessory drive belt.
(11) Remove the high pressure fuel pump (Refer to
14 - FUEL SYSTEM/FUEL DELIVERY/FUEL PUMP
- REMOVAL).
(12) Remove water pump (Refer to 7 - COOLING/
ENGINE/WATER PUMP - REMOVAL).
(13) Remove accessory drive belt pulley and vibra-
tion damper (Refer to 9 - ENGINE/ENGINE BLOCK/
VIBRATION DAMPER - REMOVAL).
(14) Remove the power steering pump.NOTE: NO NOT open the air conditioning system.
(15) Unplug AC compressor electrical connector
and unbolt AC compressor. Relocate in lower engine
compartmentwith outopening the system.
(16) Remove the generator with wiring attached
and relocate somewhere in the engine compartment.
(17) Install engine support fixture.
(18) Remove the oil pan.
(19) Detach the coolant hose to oil-water heat
exchanger at crankcase (Fig. 73).
(20) Remove the cylinder head to timing cover
bolts (Fig. 73).
(21) Remove the timing cover bolts and cover (Fig.
73).
(22) Remove remaining ancillary components
attached to the timing case cover (Fig. 73).
NOTE: Inspect condition of hoses and clamps,
replace as necessary.
(23) Remove timing chain tensioner (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT/CHAIN
AND SPROCKETS - REMOVAL)
(24) Remove timing case cover (Fig. 73).
Fig. 73 TIMING CHAIN COVER
1 - CYLINDER HEAD TO TIMING COVER BOLT
2 - OIL-WATER HEAT EXCHANGER
3 - GASKET
4 - DRIVE BELT TENSIONER
5 - FRONT CRANKSHAFT SEAL
6 - TIMING CHAIN COVER
9 - 70 ENGINEVA

INSTALLATION
CAUTION: Care must be taken to closley inspect
the gasket area around the time case cover to cyl-
inder head gasket coolant port. If damage is found,
replace the cylinder head gasket. Failure to do so
may result in engine damage.
NOTE: Thoroughly clean all mating surfaces with
the appropriate solvents to assure that no grease or
oil is present during assembly.
(1) Inspect cylinder head gasket and oil pan gas-
ket. If damaged, replace.
(2) Replace the front crankshaft seal (Refer to 9 -
ENGINE/ENGINE BLOCK/CRANKSHAFT OIL
SEAL - FRONT - INSTALLATION).
(3) Install ancillary components to timing case
cover.
(4) Apply sealant to the marked surfaces with a
bead thickness of 1.5   0.5 mm (Fig. 74).
NOTE: Install timing cover within 10 minutes after
applying sealant. Do not spread sealant bead.
NOTE: Do not seal pressurized oil galleries to the
crankcase. Sealant applied at these points is
entrained by the oil flow and blocks the oil supply
passages.
(5) Position and install timing case cover. Tighten
bolts to 20 N´m (177 lbs in) (Fig. 73).(6) Install the M8 bolts of cylinder head on timing
case cover. Tighten bolts to 20 N´m (177 lbs in) (Fig.
73).
(7) Install timing chain tensioner with new seal
(Refer to 9 - ENGINE/VALVE TIMING/TMNG BELT/
CHAIN TENSIONER&PULLEY - INSTALLATION).
(8) Position and install the oil pan. Tighten M6
bolts to 9 N´m (80 lbs in) and M8 bolts to 20 N´m
(177 lbs in).
(9) Install belt /pulley vibration damper. Tighten
M8.8 bolt in two stages, 200N´m (147 lbs ft.) then
90É, M10.9 bolt 325N´m (240 lbs ft) then 90É.
(10) Remove the engine support fixture.
(11) Install generator (Refer to 8 - ELECTRICAL/
CHARGING/GENERATOR - INSTALLATION).
(12) Install the air conditioning compressor.
(13) Install the power steering pump.
(14) Install water pump (Refer to 7 - COOLING/
ENGINE/WATER PUMP - INSTALLATION).
(15) Connect coolant hose to oil-water heat
exchanger.
(16) Install high pressure fuel pump (Refer to 14 -
FUEL SYSTEM/FUEL DELIVERY/FUEL PUMP -
INSTALLATION).
(17) Apply sealant to lower portion of, and install,
front cover to cylinder block. Tighten bolts to 20N´m
(177 lbs in) (Refer to 9 - ENGINE/CYLINDER HEAD
- INSTALLATION).
(18) Remove retaining lock for crankshaft/starter
ring gear.
(19) Tighten the oil drain plug to 30N´m (265 lbs
in).
(20) Install a new oil filter. tighten screw cap for
filter to 25N´m (221 lbs. in.).
(21) Install the accessory drive belt.
(22) Install the radiator assembly (Refer to 7 -
COOLING/ENGINE/RADIATOR - INSTALLATION).
(23) Install air intake hose.
(24) Fill coolant to the proper level, with the
proper coolant (Refer to 7 - COOLING/ENGINE/
COOLANT - STANDARD PROCEDURE).
(25) Fill the crankcase with the correct oil, to the
proper level. Refer to owners manual for specifica-
tions.
(26) Connect the negative battery cable.
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING. DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR
HANDS NEAR THE PULLEYS, BELTS OR FAN. DO
NOT WEAR LOOSE CLOTHES.
CAUTION: DO NOT pressure test cooling system
until the engine reaches operating temperature.
Fig. 74 TIMING CHAIN COVER SEALING SURFACE
1 - TIMING CHAIN COVER
2 - SEALANT BEAD
VAENGINE 9 - 71

INSTRUMENT PANEL ASSEM-
BLY
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
²WHEN REMOVING A DEPLOYED AIRBAG, RUB-
BER GLOVES, EYE PROTECTION, AND A LONG-
SLEEVED SHIRT SHOULD BE WORN. THERE MAY
BE DEPOSITS ON THE AIRBAG UNIT AND OTHER
INTERIOR SURFACES. IN LARGE DOSES, THESE
DEPOSITS MAY CAUSE IRRITATION TO THE SKIN
AND EYES.
²USE EXTREME CARE TO PREVENT ANY FOR-
EIGN MATERIAL FROM ENTERING THE PASSEN-
GER AIRBAG, OR BECOMING ENTRAPPED
BETWEEN THE PASSENGER AIRBAG CUSHION
AND THE PASSENGER AIRBAG DOOR. FAILURE TO
OBSERVE THIS WARNING COULD RESULT IN
OCCUPANT INJURIES UPON AIRBAG DEPLOY-
MENT.
²THE PASSENGER AIRBAG DOOR MUST
NEVER BE PAINTED. REPLACEMENT PASSENGER
AIRBAGS ARE SERVICED WITH DOORS IN THE
ORIGINAL COLORS. PAINT MAY CHANGE THE WAY
IN WHICH THE MATERIAL OF THE AIRBAG DOOR
RESPONDS TO AN AIRBAG DEPLOYMENT. FAIL-
URE TO OBSERVE THIS WARNING COULD RESULT
IN OCCUPANT INJURIES UPON AIRBAG DEPLOY-
MENT.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove radio. (Refer to 8 - ELECTRICAL/AU-
DIO/RADIO - REMOVAL)
(3) Remove glove compartment. (Refer to 23 -
BODY/INSTRUMENT PANEL/GLOVE BOX -
REMOVAL)
(4) Remove cup holder. (Refer to 23 - BODY/IN-
STRUMENT PANEL/CUP HOLDER - REMOVAL)
(5) Remove instrument cluster. (Refer to 8 - ELEC-
TRICAL/INSTRUMENT CLUSTER - REMOVAL)(6) Remove passenger airbag. (Refer to 8 - ELEC-
TRICAL/RESTRAINTS/PASSENGER AIRBAG -
REMOVAL)
(7) Remove right and left speakers. (Refer to 8 -
ELECTRICAL/AUDIO/SPEAKER - REMOVAL)
(8) Remove center bezel. (Refer to 23 - BODY/IN-
STRUMENT PANEL/INSTRUMENT PANEL CEN-
TER BEZEL - REMOVAL)
(9) Remove air conditioning push-button control
module. (Fig. 7)
(10) Twist cover lock 1/4 turn and remove Power
Distribution Center (PDC) cover. (Fig. 8)
(11) Remove nut and screws and remove steering
column shroud. (Fig. 9)
Fig. 7 HVAC CONTROL MODULE
1 - CONTROL CABLES
2 - ELECTRICAL CONNECTORS
3 - MODULE
4 - SCREWS
Fig. 8 POWER DISTRIBUTION CENTER COVER
1 - COVER LOCK
2 - COVER
VAINSTRUMENT PANEL 23 - 59

(9) Install instrument panel top cover and screws.
(Fig. 15)
(10) Install right outer and inner air nozzles. (Fig.
13)
(11) Install right side cover and screws.
(12) Wrap protective mat around connectors
behind instrument cluster.
(13) Install left outer and inner air nozzles.
(14) Install left side cover and screws.
(15) Install passenger side air nozzle cover and
bracket and install the screws. (Fig. 12)
(16) Position Power Distribution Center (PDC) in
vehicle and connect electrical connectors. (Fig. 11)
(17) Install PDC and install bolt and nut. (Fig. 10)
(18) Install PDC ground cable and nut.
(19) Install steering column shroud and install the
two screws and one nut. (Fig. 9)
(20) Install PDC cover and twist lock 1/4 turn to
secure in place. (Fig. 8)
(21) Connect electrical connectors and cables to air
conditioning push-button module and install. (Fig. 7)
(22) Install center bezel. (Refer to 23 - BODY/IN-
STRUMENT PANEL/INSTRUMENT PANEL CEN-
TER BEZEL - INSTALLATION)
(23) Install left and right speakers. (Refer to 8 -
ELECTRICAL/AUDIO/SPEAKER - INSTALLATION)
(24) Install passenger airbag. (Refer to 8 - ELEC-
TRICAL/RESTRAINTS/PASSENGER AIRBAG -
INSTALLATION)
(25) Install instrument cluster. (Refer to 8 - ELEC-
TRICAL/INSTRUMENT CLUSTER - INSTALLA-
TION)
(26) Install cup holder. (Refer to 23 - BODY/IN-
STRUMENT PANEL/CUP HOLDER - INSTALLA-
TION)
(27) Install glove compartment. (Refer to 23 -
BODY/INSTRUMENT PANEL/GLOVE BOX -
INSTALLATION)
(28) Install radio. (Refer to 8 - ELECTRICAL/AU-
DIO/RADIO - INSTALLATION)
(29) Connect battery negative cable.
TOP COVER - CLUSTER
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURETO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Remove the screws and using a trim stick
C-4755 or equivalent, remove the cover. (Fig. 23)
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Position the cover and install the screws.
Fig. 23 Instrument Cluster Remove/Install
1 - SCREW (2)
2 - COVER
3 - SCREW (2)
4 - INSTRUMENT CLUSTER
5 - LOOP (2)
23 - 64 INSTRUMENT PANELVA

HEATING & AIR CONDITIONING
TABLE OF CONTENTS
page page
HEATING & AIR CONDITIONING
DESCRIPTION..........................1
OPERATION............................2
DIAGNOSIS AND TESTING
A/C PERFORMANCE....................3
HEATER PERFORMANCE TEST...........5
ATC FUNCTION TEST...................6
SPECIFICATIONS
HEATING-A/C SYSTEM..................6CONTROLS-FRONT........................8
CONTROLS - REAR......................24
DISTRIBUTION - FRONT...................45
DISTRIBUTION - REAR....................52
PLUMBING.............................60
CABIN HEATER.........................104
HEATING & AIR CONDITION-
ING
DESCRIPTION
An automatic temperature control (ATC) single
zone type heating-A/C system is standard equipment
on this model.
To maintain the performance level of the heating,
ventilation and air conditioning (HVAC) system, the
engine cooling system must be properly maintained.
The use of a bug screen is not recommended. Any
obstructions in front of the radiator or A/C condenser
will reduce the performance of the A/C and engine
cooling systems.
The engine cooling system includes the radiator,
thermostat, radiator hoses and the engine coolant
pump. Refer to 7 - Cooling for more information
before opening or attempting any service to the
engine cooling system.
All vehicles are equipped with a common ventila-
tion housing (Fig. 1) located in the engine compart-
ment which includes:
²Blower motor
²Blower motor resistor block
²Recirculation door and actuator
All vehicles are also equipped with a common
heater housing (Fig. 2) mounted under the instru-
ment panel which includes:
²Heater core
²Evaporator core
²Evaporator temperature sensor
²Expansion valve
²Air outlet temperature sensor
²Mode doors
Fig. 1 Ventilation Housing
1 - NUT (5)
2 - WASHER (5)
3 - VENTILATION HOUSING
4 - HOUSING COVER
VAHEATING & AIR CONDITIONING 24 - 1

Some vehicles are equipped with an additional
Denso 10S17 A/C compressor mounted to the engine
which is used for the optional rear A/C system and
various add-on A/C systems (Fig. 3).A heater booster is used to aid in warming the
engine coolant. The heater booster system can be
switched on while the vehicle is being driven to help
the engine reach its normal operating temperature
quickly and will help aid in heating up the air within
the passenger compartment quickly when requested
by the operator (Fig. 4).
OPERATION
Outside air enters the vehicle through the hood
opening at the base of the windshield, and passes
through the ventilation housing located in the engine
compartment into the heater housing located behind
the instrument panel. Air flow velocity is adjusted
with the blower motor speed selector thumbwheel on
the A/C-heater control. The air intake openings must
be kept free of snow, ice, leaves, and other obstruc-
tions for the HVAC system to receive a sufficient vol-
ume of outside air.
The automatic temperature control (ATC) system
controls interior temperature by taking actual values
from the temperature sensors and the CAN bus and
comparing them to the nominal value of the temper-
ature control switch. The electric pulsed heater valve
is then energized depending on the requested quan-
tity of heat and an electrically-operated water pump
gives a nearly constant water flow for exact temper-
ature regulation. If the solenoid is not energized, the
coolant circuit to the heat exchanger is fully open. To
control the temperature the solenoid valve is pulsed
by the ATC in periods of four seconds.
The mode control knob on the A/C-heater control is
used to direct the conditioned air flow to the selected
air outlets. The mode control knob operates the mode
doors by cables connected to the mode doors.
Fig. 2 Heater Housing
1 - SCREW (12)
2 - UPPER HOUSING
3 - A/C EVAPORATOR
4 - EVAPORATOR O-RING SEAL (2)
5 - EVAPORATOR GASKET
6 - VENTILATION HOUSING GASKET
7 - LOWER HOUSING
8 - WIRING HARNESS
9 - BOLT (3)
10 - HEATER CORE
11 - HEATER CORE TUBE ASSEMBLY
12 - HEATER CORE TUBE GASKET
13 - HEATER CORE TUBE O-RING SEAL (2)
Fig. 3 Denso 10S17 A/C Compressor
Fig. 4 Heater Booster
24 - 2 HEATING & AIR CONDITIONINGVA