MERCEDES-BENZ SPRINTER 2005 Service Repair Manual

To maintain minimum evaporator temperature and
prevent evaporator freezing, an evaporator tempera-
ture sensor is used.
Vehicles equipped with the available rear A/C sys-
tem have an individual temperature control and
blower motor speed switches. When the rear A/C sys-
tem is turned on, a solenoid valve opens the rear
refrigerant circuit and activates the blower motor for
the rear evaporator. The circulated internal air tem-
perature is measured by a temperature sensor and
the temperature value is compared within the rear
A/C control module to an adjusted value at the tem-
perature control switch. To prevent icing of the rear
evaporator, the temperature switch cuts off the flow
of refrigerant through the rear A/C circuit by de-en-
ergizing the solenoid valve.
The front and rear A/C systems are designed for
the use of non-CFC, R-134a refrigerant only. Both
the front and rear systems use an expansion valve to
meter refrigerant flow to the evaporator.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - FUNCTION TEST
The ATC system can perform an self-test, which
can be activated by the DRBIIItscan tool to confirm
that the air conditioning system is performing satis-
factorily. This test provides a quick confirmation of
heater - air conditioning system performance to the
service technician. Refer to Body Diagnostic Proce-
dures for the appropriate diagnostic information.
DIAGNOSIS AND TESTING - A/C
PERFORMANCE TEST
The air conditioning system is designed to provide
the passenger compartment with low temperature
and low specific humidity air. The evaporator, located
in the heater housing on the dash panel below the
instrument panel, is cooled to temperatures near the
freezing point. As warm damp air passes through the
cooled evaporator, the air transfers its heat to the
refrigerant in the evaporator and the moisture in the
air condenses on the evaporator fins. During periods
of high heat and humidity, an air conditioning sys-
tem will be more effective in the Recirculation Mode.
With the system in the Recirculation Mode, only air
from the passenger compartment passes through the
evaporator. As the passenger compartment air dehu-
midifies, the air conditioning system performance
levels improve.
Humidity has an important bearing on the temper-
ature of the air delivered to the interior of the vehi-
cle. It is important to understand the effect that
humidity has on the performance of the air condition-
ing system. When humidity is high, the evaporatorhas to perform a double duty. It must lower the air
temperature, and it must lower the temperature of
the moisture in the air that condenses on the evapo-
rator fins. Condensing the moisture in the air trans-
fers heat energy into the evaporator fins and tubing.
This reduces the amount of heat the evaporator can
absorb from the air. High humidity greatly reduces
the ability of the evaporator to lower the temperature
of the air.
However, evaporator capacity used to reduce the
amount of moisture in the air is not wasted. Remov-
ing some of the moisture out of the air entering the
vehicle adds to the comfort of the passengers.
Although, an owner may expect too much from their
air conditioning system on humid days. A perfor-
mance test is the best way to determine whether the
system is performing up to standard. This test also
provides valuable clues as to the possible cause of
trouble with the air conditioning system.
WARNING: REFER TO THE APPLICABLE WARN-
INGS AND CAUTIONS FOR THIS SYSTEM BEFORE
PERFORMING THE FOLLOWING OPERATION (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMBING -
WARNING) and (Refer to 24 - HEATING & AIR CON-
DITIONING/PLUMBING - CAUTION).
NOTE: Very specific instructions and conditions
pertain to this procedure which are significantly dif-
ferent than procedures used in other vehicle appli-
cations. Follow each step in the order they are
presented. Do not skip steps or change conditions
from those stated or results will be adversely
affected and invalid.
The compressor clutch is de-energized under any of
the following conditions:
²Blocked compressor (thermal fuse in the pulley)
²Low pressure in the system
²Low evaporator temperature
²Hard acceleration (WOT)
²High coolant temperatures
(1) Place the vehicle in the shade with all widows
open.
(2) Turn the temperature control to cold.
(3) Select Fresh Air, not Recirculate and open all
air conditioning duct louvers.
(4) Start the vehicle and allow it to idle.
(5) Turn the blower switch to the maximum blower
speed setting and allow to operate for a short period
of time before proceeding.
(6) Perform an outlet temperature test as follows:
a. Turn the blower switch to the lowest blower
speed setting.
b. Insert a thermometer into a center duct for at
least five minutes.
VAHEATING & AIR CONDITIONING 24 - 3
HEATING & AIR CONDITIONING (Continued)

c. With the engine running, duct temperature
should not be less than 2É C (35É F) or than 12É C
(54É F).
(7) If the compressor has not cycled off and the
duct temperature is less than 2É C (35É F) , check the
evaporator temperature sensor and circuit by per-
forming the ATC Function Test (Refer to 24 - HEAT-
ING & AIR CONDITIONING - DIAGNOSIS AND
TESTING).
(8) If duct output temperature is not within speci-
fications, check the refrigerant system for leaks and
proper refrigerant charge (Refer to 24 - HEATING &
AIR CONDITIONING/PLUMBING - DIAGNOSIS
AND TESTING) and (Refer to 24 - HEATING & AIR
CONDITIONING/PLUMBING - STANDARD PRO-
CEDURE).
DIAGNOSIS AND TESTING - HEATER
PERFORMANCE
Before performing the following tests, perform the
ATC Function Test using the DRBIIItand refer toCooling for the procedures to check the radiator cool-
ant level, serpentine drive belt tension, radiator air
flow and the radiator fan operation.
MAXIMUM HEATER OUTPUT
Engine coolant is provided to the heater core
through a heater valve and heater hose. With the
engine idling at normal operating temperature, set
the heater-A/C controls as follows:
²Temperature control in the full hot position
²Mode control in the floor heat position
²Blower motor control in the highest speed posi-
tion
Using a test thermometer, check the temperature
of the air being discharged at the floor outlets. Com-
pare the test thermometer reading to the Tempera-
ture Reference chart.
TEMPERATURE REFERENCE CHART
Ambient Temperature Minimum Floor Outlet Temperature
Celsius Fahreheit Celsius Fahreheit
15.5É 60É 62.2É 144É
21.1É 70É 63.8É 147É
26.6É 80É 65.5É 150É
32.2É 90É 67.2É 153É
If the floor outlet air temperature is insufficient,
check for a faulty heater valve (perform ATC Func-
tion Test) and verify that the cooling system is oper-
ating to specifications (Refer to 7 - COOLING/
ENGINE/COOLANT - DIAGNOSIS AND TESTING).
Both of the heater hoses should be HOT to the touch
(the coolant return heater hose should be slightly
cooler than the supply hose. If the coolant return
hose is much cooler than the supply hose, locate and
repair the engine coolant flow obstruction in the
heater system.
POSSIBLE LOCATIONS OR CAUSE OF
OBSTRUCTED COOLANT FLOW
²Pinched or kinked heater hoses.
²Improper heater hose routing.
²Plugged heater hoses or supply and return ports
at the cooling system connections.
²Inoperative or stuck heater water valve.
²Plugged heater core.If proper coolant flow is verified, and heater floor
outlet air temperature is insufficient, a mechanical
problem may exist.
POSSIBLE LOCATIONS OR CAUSE OF
INSUFFICIENT HEAT
²An obstructed cowl air intake.
²Obstructed heater system outlets.
²Heater water valve not functioning properly.
TEMPERATURE CONTROL
If outlet air temperature cannot be adjusted with
the A/C-heater temperature control, one of the follow-
ing could require service:
²Faulty A/C-heater control switch.
²Faulty temperature sensor.
²Faulty A/C-heater control cable or actuator.
²Faulty A/C-heater control module.
24 - 4 HEATING & AIR CONDITIONINGVA
HEATING & AIR CONDITIONING (Continued)

SPECIFICATIONS
A/C SYSTEM
The R-134a refrigerant system charge capacity for
this vehicle can be found on the underhood specifica-
tion label for the A/C unit.
SYSTEM SPECIFICATIONS
Item Description Notes
Compressor Nippondenso -
7SBU16CND-8 PAG oil
Low psi Control A/C Pressure
TransducerLiquid line
mounted -
opens below
152 kPa (22
psi) - resets
above 234 - 262
(34-38 psi)
Item Description Notes
High psi Control High Pressure
Relief ValveCompressor
mounted -
opens at a
discharge
pressure over
3445 04135 kPa
(500 - 600 psi)
Compressor
Clutch Coil
Draw2.0-3.7 amps
@ 11.5 - 12V
@ 21É C (70É
F)
Compressor
Clutch Air Gap0.5 - 0.88 mm
(0.020 - 0.035
in.)
TORQUE SPECIFICATIONS
Description N´m Ft. Lbs. In. Lbs.
A/C Compressor bolts 20 15 Ð
A/C Compressor Shaft Bolt 17.5 Ð 155
Air Nozzle Reinforcing
Plate Screws2Ð 17
Air Outlet Screws 2 Ð 17
Auxiliary Fan Bracket
Screws5Ð 45
Auxiliary Fan Bracket Nuts 5 Ð 45
Blower Motor Screws 2 Ð 17
Condenser Screws 2 Ð 17
Defroster Duct Screws 2 Ð 17
Discharge Line to
Compressor Bolt23 17 Ð
Discharge Line to
Compressor Nut33 24 Ð
Heater-A/C Control Screws 2 Ð 17
Heater Core Tube to Heater
Core Bolts5Ð 45
Heater Housing Cover
Screws2Ð 17
Heater Housing to Dash
Panel Screws4.5 Ð 40
Electric Coolant Pump
Bracket Bolts5Ð 45
VAHEATING & AIR CONDITIONING 24 - 5
HEATING & AIR CONDITIONING (Continued)

Description N´m Ft. Lbs. In. Lbs.
Expansion Valve to
Evaporator Tube Tapping
Plate Bolts5Ð 45
Floor Duct Screws 2 Ð 17
Heater Core Tube Bolts 5 Ð 45
Heater Water Valve Bracket
Bolts5Ð 45
Instrument Panel Duct
Screws2Ð 17
Instrument Panel End
Cover Screws2Ð 17
Intermediate Suction Line
to Front Suction Line
Tapping Plate Bolt10 Ð 89
Liquid Line to Condenser
Nut17 12 Ð
Liquid Line to Reciever-
Drier Bolt7Ð 62
Rear A/C Control Module
Screws2Ð 17
Rear A/C Solenoid Valve
Screws10 Ð 89
Rear A/C Solenoid Valve
Refrigerant Line Nuts16 Ð 142
Rear A/C Blower Motor
Screws5Ð 45
Rear A/C Refrigerant Line
Retaining Block Bolts5Ð 45
Rear A/C Suction Line to
Front Suction Line Tapping
Plate Bolt5Ð 45
Rear Condensation Trap
Screws2Ð 17
Rear Evaporator Housing
Bolts20 15 177
Rear Evaporator Housing
Screw5Ð 45
Rear Evaporator Panel
Screws2Ð 17
Rear Expansion Valve to
Evaporator Tapping Plate
Bolts5Ð 45
Rear Liquid Line to
Expansion and Solenoid
Valve Nuts16 Ð 142
Rear Liquid Line to
Intermediate Liquid Line
Nut16 Ð 142
24 - 6 HEATING & AIR CONDITIONINGVA
HEATING & AIR CONDITIONING (Continued)

Description N´m Ft. Lbs. In. Lbs.
Rear Liquid Line to
Sidewall Liquid Line Nut16 Ð 142
Rear Suction Line to
Intermediate Suction Line
Nut30 22 Ð
Rear Suction Line to
Sidewall Suction Line Nut30 22 Ð
Rear Suction Line to
Solenoid Valve10 Ð 89
Recirculation Door Actuator
Screws2Ð 17
Suction Line Routing Clip
Nut5Ð 45
Suction Line to Compressor
Bolt23 17 Ð
Suction Line to Front
Expansion Valve Nut10 Ð 89
Supplemental Heater Air
Intake Pipe Screws7Ð 62
Supplemental Heater M6
Fasteners7Ð 62
Supplemental Heater M8
Fasteners23 17 Ð
Supplemental Heater Seat
to Mounting Flange Nut60 44 Ð
Terminal Block to
Evaporator Bolts5Ð 45
Ventilation Housing to Dash
Panel Nuts5Ð 45
VAHEATING & AIR CONDITIONING 24 - 7
HEATING & AIR CONDITIONING (Continued)

CONTROLS - FRONT
TABLE OF CONTENTS
page page
A/C COMPRESSOR CLUTCH
DESCRIPTION..........................8
OPERATION............................8
STANDARD PROCEDURE
STANDARD PROCEDURE - COMPRESSOR
CLUTCH AIR GAP......................9
STANDARD PROCEDURE - COMPRESSOR
CLUTCH BREAK-IN.....................9
REMOVAL.............................9
INSPECTION - COMPRESSOR CLUTCH/COIL . 10
INSTALLATION.........................11
A/C COMPRESSOR CLUTCH COIL
DIAGNOSIS AND TESTING - COMPRESSOR
CLUTCH COIL........................12
A/C HEATER CONTROL
DESCRIPTION.........................12
OPERATION...........................12
REMOVAL.............................12
INSTALLATION.........................13
A/C PRESSURE TRANSDUCER
DESCRIPTION.........................13
OPERATION...........................13
DIAGNOSIS AND TESTING - A/C PRESSURE
TRANSDUCER.......................13
REMOVAL.............................14
INSTALLATION.........................14
AIR OUTLET TEMPERATURE SENSOR
DESCRIPTION.........................14
OPERATION...........................15
REMOVAL.............................15
INSTALLATION.........................15
AMBIENT TEMPERATURE SENSOR
DESCRIPTION.........................15
OPERATION...........................15REMOVAL.............................15
INSTALLATION.........................16
BLOWER MOTOR RESISTOR BLOCK
DESCRIPTION.........................16
OPERATION...........................16
DIAGNOSIS AND TESTING - BLOWER
MOTOR RESISTOR BLOCK..............16
REMOVAL.............................16
INSTALLATION.........................17
BLOWER MOTOR SWITCH
DESCRIPTION.........................17
OPERATION...........................17
DIAGNOSIS AND TESTING - BLOWER
MOTOR SWITCH......................17
REMOVAL.............................17
EVAPORATOR TEMPERATURE SENSOR
DESCRIPTION.........................17
OPERATION...........................18
REMOVAL.............................18
INSTALLATION.........................18
IN-CAR TEMPERATURE SENSOR
DESCRIPTION.........................19
OPERATION...........................19
DIAGNOSIS AND TESTING................19
REMOVAL.............................19
MODE DOOR CABLES
REMOVAL.............................19
INSTALLATION.........................19
RECIRCULATION DOOR ACTUATOR
DESCRIPTION.........................20
OPERATION...........................20
REMOVAL.............................21
INSTALLATION.........................21
A/C COMPRESSOR CLUTCH
DESCRIPTION
The compressor clutch assembly consists of a sta-
tionary electromagnetic coil, a hub bearing and pul-
ley assembly, and a clutch plate (Fig. 1). The
electromagnetic coil unit and the hub bearing and
pulley assembly are each retained on the nose of the
compressor front housing with snap rings. The clutch
plate is keyed to the compressor shaft and secured
with a bolt.
The compressor clutch plate and pully, or the clutch
coil are available for seperate service replacement.
OPERATION
The compressor clutch components provide the
means to engage and disengage the compressor from
the engine serpentine accessory drive belt. When the
clutch coil is energized, it magnetically draws the
clutch into contact with the pulley and drives the
compressor shaft. When the coil is not energized, the
pulley freewheels on the clutch hub bearing, which is
part of the pulley.
24 - 8 CONTROLS - FRONTVA

The compressor clutch engagement is controlled by
several components:
²A/C switch on the A/C-heater control panel
²Evaporator temperature sensor
²A/C pressure transducer
²Air temperature sensor
²CAN bus messages
The compressor clutch is de-energized under any of
the following conditions:
²Blocked compressor (thermal fuse in the pulley)
²Low pressure in the system
²Low evaporator temperature
²Hard acceleration (WOT)
²High coolant temperatures
STANDARD PROCEDURE
STANDARD PROCEDURE - COMPRESSOR
CLUTCH AIR GAP
If a new clutch plate and/or clutch pulley are being
used, the air gap between the clutch plate and clutch
pulley must be checked using the following proce-
dure:
(1) Using feeler gauges, measure the air gap
between the clutch plate and the clutch pulley fric-
tion surfaces.
(2) If the air gap is not between 0.5 and 0.9 mm
(0.020 and 0.035 in.), add or subtract shims until the
desired air gap is obtained.
NOTE: The shims may compress after tightening
the compressor shaft bolt. Check the air gap in four
or more places on the clutch plate to verify that theair gap is still correct. Spin the clutch pulley before
making the final air gap check.
STANDARD PROCEDURE - COMPRESSOR
CLUTCH BREAK-IN
After a new compressor clutch has been installed,
cycle the compressor clutch approximately twenty
times (five seconds on, then five seconds off). During
this procedure, set the heater-A/C control in the
Recirculation Mode, the A/C button in the on posi-
tion, the blower motor switch in the highest speed
position, and the engine speed at 1500 to 2000 rpm.
This procedure (burnishing) will seat the opposing
friction surfaces and provide a higher compressor
clutch torque capability.
REMOVAL
The refrigerant system can remain fully-charged
during compressor clutch, pulley, or coil replacement.
The compressor clutch can be serviced in the vehicle.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the serpentine drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
(3) Disconnect the engine wire harness connector
for the compressor clutch coil from the clutch coil
wire harness connector on the top of the compressor.
(4) Disengage the retainer on the engine wire har-
ness compressor clutch coil lead from the bracket on
the top of the compressor.
(5) Remove the bolt that secures the compressor
clutch to the compressor shaft (Fig. 2). If necessary, a
band-type oil filter wrench or strap wrench can be
placed around the clutch plate to aid in bolt removal.
Fig. 1 Compressor Clutch Ð Typical
1 - CLUTCH PLATE
2 - SHAFT KEY
3 - PULLEY AND BEARING
4 - CLUTCH COIL
5 - CLUTCH SHIMS
6 - SNAP RING
7 - SNAP RING
Fig. 2 Compressor Shaft Bolt and Clutch Plate
1 - COMPRESSOR CLUTCH PLATE
2 - COMPRESSOR SHAFT BOLT
VACONTROLS - FRONT 24 - 9
A/C COMPRESSOR CLUTCH (Continued)

(6) Tap the clutch plate lightly with a plastic mal-
let to release it from the splines on the compressor
shaft. Remove the clutch plate and shim(s) from the
compressor shaft (Fig. 3).Be certain not to lose
the shim or shims.
CAUTION: Do not pry between the clutch plate and
the pulley to remove it from the compressor shaft.
Prying may damage the clutch plate.
(7) Using snap ring pliers (Special Tool C-4574 or
equivalent), remove the external snap ring that
secures the compressor clutch pulley to the front of
the compressor, then slide the pulley off of the com-
pressor (Fig. 4).
(8) Remove the screw that secures the clutch coil
wire harness connector bracket and ground clip to
the top of the compressor housing.
(9) Using snap ring pliers (Special Tool C-4574 or
equivalent), remove the external snap ring that
secures the compressor clutch coil to the front of the
compressor, then slide the clutch coil off of the com-
pressor (Fig. 5).
INSPECTION - COMPRESSOR CLUTCH/COIL
Compressor clutch components should always be
inspected closely before they are reinstalled. The
clutch plate and clutch pulley are mated at the fac-
tory using a burnishing operation. No attempt should
be made to separately replace the compressor clutch
pulley or clutch plate. The clutch coil may be serviced
separately.
(1) Examine the friction surfaces of the clutch pul-
ley and the clutch plate for wear. The clutch pulley
and clutch plate should be replaced if there is exces-
sive wear or scoring.
Fig. 3 Clutch Plate And Shim(s)
1 - COMPRESSOR SHAFT
2 - CLUTCH PLATE
3 - CLUTCH PLATE SHIM
Fig. 4 Pulley Snap Ring
1 - SNAP RING
Fig. 5 Clutch Coil Snap Ring
1 - SNAP RING PLIERS
2 - CLUTCH COIL
3 - SNAP RING
4 - COMPRESSOR
24 - 10 CONTROLS - FRONTVA
A/C COMPRESSOR CLUTCH (Continued)

(2) Examine the friction surfaces of the clutch pul-
ley and the clutch plate for oil contamination. If the
friction surfaces are oily, the clutch pulley and clutch
plate should be replaced. Also inspect the shaft and
nose area of the compressor for oil. Remove the felt
packing from around the compressor shaft in the
compressor front cover. If the felt is saturated with
oil, the compressor front shaft seal is leaking and the
compressor will also have to be replaced.
(3) Check the clutch pulley bearing for roughness
or excessive leakage of grease. Replace the clutch
pulley and clutch plate if the bearing is faulty.
INSTALLATION
(1) Align the dowel pin on the back of the clutch
field coil with the hole in the compressor front cover,
and position the clutch coil onto the compressor. Be
certain that the cluch coil wire harness leads are
properly oriented and routed so that they are not
pinched between the compressor front cover and the
clutch coil.
NOTE: A new snap ring must be used to secure the
clutch coil to the compressor. The bevel side of the
snap ring must face outward.
(2) Using snap ring pliers (Special Tool C-4574 or
equivalent), install the external snap ring that
secures the clutch coil to the front cover of the com-
pressor. The bevel side of the snap ring must be fac-
ing outward and both snap ring eyelets must be
oriented to the right or left of the clutch coil dowel
pin on the compressor. Be certain that the snap ring
is fully and properly seated in the groove.
CAUTION: If the snap ring is not fully seated in the
groove it will vibrate out, resulting in a clutch fail-
ure and severe damage to the compressor front
cover.
(3) Install and tighten the screw that secures the
clutch coil wire harness connector bracket and
ground clip to the top of the compressor housing.
(4) Install the pulley onto the front of the compres-
sor. If necessary, place a block of wood on the friction
surface and tap gently with a hammer (Fig. 6).
CAUTION: Do not mar the friction surfaces of the
pulley.
(5) Using snap ring pliers (Special Tool C-4574 or
equivalent), install the external snap ring (bevel side
facing outward) that secures the clutch pulley to the
front cover of the compressor. Be certain that the
snap ring is properly fully and properly seated in the
groove.(6) If the original clutch plate and clutch pulley
are to be reused, reinstall the original shim(s) on the
compressor shaft against the shoulder. If a new
clutch plate and/or clutch pulley are being used,
install a trial stack of shims 1.0 mm (0.040 in.) thick
on the compressor shaft against the shoulder.
(7) Install the clutch plate onto the compressor
shaft.
(8) Install and tighten the compressor shaft bolt. If
necessary, a band-type oil filter wrench or a strap
wrench can be placed around the clutch plate to aid
in bolt tightening. Tighten the bolt to 17.5 N´m (155
in. lbs.).
NOTE: The shims may compress after tightening
the shaft bolt. Check the air gap in four or more
places to verify the air gap is still correct. Spin the
pulley before performing a final check of the air
gap.
(9) If a new clutch plate and/or clutch pulley are
being installed, the air gap between the clutch plate
and clutch pulley must be checked (Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS/A/C
COMPRESSOR CLUTCH - STANDARD PROCE-
DURE).
(10) Engage the retainer on the engine wire har-
ness compressor clutch coil take out with the bracket
on the top of the compressor.
Fig. 6 Pulley Assembly Install
1 - PULLEY ASSEMBLY
2 - WOOD BLOCK
VACONTROLS - FRONT 24 - 11
A/C COMPRESSOR CLUTCH (Continued)

(11) Reconnect the engine wire harness connector
for the compressor clutch coil to the coil wire harness
connector on the top of the compressor.
(12) Reinstall the serpentine accessory drive belt
(Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE
BELTS - INSTALLATION).
(13) Reconnect the battery negative cable.
(14) If a new clutch plate and/or clutch pulley are
being installed, the new clutch components must be
burnished (Refer to 24 - HEATING & AIR CONDI-
TIONING/CONTROLS/A/C COMPRESSOR CLUTCH
- STANDARD PROCEDURE).
A/C COMPRESSOR CLUTCH
COIL
DIAGNOSIS AND TESTING - COMPRESSOR
CLUTCH COIL
The air conditioning compressor clutch coil electri-
cal circuit is controlled by the ATC control module
which is integral to the heater-A/C control. Begin
testing of a suspected compressor clutch coil problem
by performing the ATC Function Test using the
DRBIIItscan tool.
A/C HEATER CONTROL
DESCRIPTION
This ATC system uses a combination of electrical
and mechanical controls. These controls provide the
vehicle operator with a number of setting options to
help control the climate and comfort within the vehi-
cle.
The A/C-heater control panel is located on the
instrument panel inboard of the steering column and
below the radio (Fig. 7). The A/C-heater control panel
contains a rotary-type temperature control knob, a
rotary-type mode control knob, a thumbwheel-type
blower motor speed control and an air conditioning
compressor push button switch and indicator lamp.
The A/C-heater control panel also features a push
button switch and indicator lamp for the residual
engine heat utilization (REST) function, cabin heater
or the heater booster (as equipped).
The A/C-heater control panel cannot be adjusted or
repaired and, if faulty or damaged, it must be
replaced.
OPERATION
To control the interior temperature, the A/C-heater
control module uses the actual values from the tem-
perature sensors and the CAN bus and compares
them with the nominal value of the temperature con-
trol switch.The A/C-heater control panel is serviced only as
complete unit and cannot be repaired. If faulty or
damaged, the entire control panel unit must be
replaced.
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN AN ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the center bezel from the instrument
panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
INSTRUMENT PANEL CENTER BEZEL - REMOV-
AL).
(3) Remove the two screws that secure the A/C-
heater control to the instrument panel (Fig. 8).
(4) Pull the A/C-heater control away from the
instrument panel far enough to access the connec-
tions on the back of the control.
(5) Mark and disconnect the two control cables
from the A/C-heater control.
Fig. 7 A/C-Heater Control Panel
24 - 12 CONTROLS - FRONTVA
A/C COMPRESSOR CLUTCH (Continued)