2006 MERCEDES-BENZ SPRINTER Service Manual

keyless service reset wheel bolt torque power steering fluid open gas tank alarm

Load previous 8 pages

Page 2065 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual INSTALLATION
(1) Position the rear A/C condenser fan relay into
the proper receptacle of the relay block located in the
rear A/C evaporator housing.
(2) Align the A/C condenser fan relay terminals
wit

Page 2066 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual input signals to control rear blower motor speed and
output air temperature, and to prevent freezing of
the rear evaporator core.
The rear A/C control module cannot be repaired
and, if faulty or damag

Page 2067 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual INSTALLATION
(1) Position the rear A/C control module to the
rear A/C evaporator housing.
(2) Install the two screws that secure the rear A/C
control module to the rear A/C evaporator housing.
Tighten

Page 2068 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual rear A/C compressor operation when the rear dis-
charge line pressure approaches high levels, and also
reduces electrical surging from rear A/C clutch
engagement.
The rear A/C high pressure switch con

rear A/C compressor operation when the rear dis-
charge line pressure approaches high levels, and also
reduces electrical surging from rear A/C clutch
engagement.
The rear A/C high pressure switch controls rear
A/C condenser cooling fan operation by monitoring
the rear discharge line pressure. When the rear dis-
charge pressure rises above approximately 1900 to
2200 kPa (280 to 320 psi) the rear A/C condenser
cooling fan will turn on. The rear condenser cooling
fan will turn off when the rear discharge pressure
drops to approximately 1600 kPa (235 psi).
The rear A/C high pressure switch contacts open
when the rear discharge line pressure rises above
approximately 3100 to 3375 kPa (450 to 490 psi). The
rear A/C high pressure switch contacts close when
the rear discharge line pressure drops to approxi-
mately 1860 to 2275 kPa (270 to 330 psi).
The rear A/C high pressure switch is factory-cali-
brated and cannot be adjusted or repaired and, if
faulty or damaged, it must be replaced. Refer to the
appropriate wiring information for complete HVAC
wiring diagrams.
REMOVAL
WARNING: Refer to the applicable warnings and
cautions for this system before performing the fol-
lowing operation (Refer to 24 - HEATING & AIR
CONDITIONING/PLUMBING - WARNINGS) and (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMBING -
CAUTIONS). Failure to follow the warnings and cau-
tions could result in possible personal injury or
death.
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the air filter from the rear A/C evapo-
rator housing (Refer to 24 - HEATING & AIR CON-
DITIONING/DISTRIBUTION - REAR/AIR FILTER -
REMOVAL).
(3) Recover the refrigerant from the rear refriger-
ant system (Refer to 24 - HEATING & AIR CONDI-
TIONING/PLUMBING - STANDARD PROCEDURE -
REFRIGERANT RECOVERY).
(4) Remove the cover from the rear A/C condenser
housing (Refer to 24 - HEATING & AIR CONDI-
TIONING/DISTRIBUTION - REAR/A/C CON-
DENSER COVER - REMOVAL).
(5) Disconnect the wire harness connector from the
rear A/C high pressure switch (Fig. 8).
(6) Remove the rear A/C high pressure switch and
install a plug into, or tape over the opened rear dis-
charge line fitting.
INSTALLATION
NOTE: Replacement of the PTFE thread sealing
tape is required anytime the rear A/C high pressure
switch is removed from the rear discharge line. Fail-
ure to replace the sealing tape could result in a rear
refrigerant system leak.
(1) Remove the tape or plug from the rear dis-
charge line fitting.
(2) Install PTFE thread sealing tape onto the rear
A/C high pressure switch and install the switch onto
the rear discharge line. Tightened the A/C high pres-
sure switch to 10 N´m (88 in. lbs.).
(3) Connect the wiring harness connector to the
rear A/C high pressure switch.
(4) Reconnect the negative battery cable.
(5) Evacuate the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
(6) Charge the rear refrigerant system (Refer to 24
- HEATING & AIR CONDITIONING/PLUMBING -
STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).
(7) Install the rear air filter (Refer to 24 - HEAT-
ING & AIR CONDITIONING/DISTRIBUTION -
REAR/AIR FILTER - INSTALLATION).
(8) Install the cover onto the rear A/C condenser
housing (Refer to 24 - HEATING & AIR CONDI-
TIONING/DISTRIBUTION - REAR/A/C CON-
DENSER COVER - INSTALLATION).
Fig. 8 Rear A/C High Pressure Switch
1 - REAR A/C CONDENSER
2 - WIRE HARNESS CONNECTOR
3 - REAR A/C HIGH PRESSURE SWITCH
4 - REAR DISCHARGE LINE FITTING
VACONTROLS - REAR 24 - 31

Page 2069 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual A / C LOW PRESSURE SWITCH
DESCRIPTION
The rear A/C low pressure switch provides a signal
to the rear A/C control module to regulate the rear
refrigerant system pressure and control rear A/C
evaporator

A / C LOW PRESSURE SWITCH
DESCRIPTION
The rear A/C low pressure switch provides a signal
to the rear A/C control module to regulate the rear
refrigerant system pressure and control rear A/C
evaporator temperature (Fig. 9). The rear A/C control
module will disengage the rear A/C clutch if the rear
refrigerant system suction line pressure falls below
30 kPa (4.4 psi).
The rear A/C low pressure switch is mounted on a
fitting located on the rear suction line near the left
side of the rear A/C evaporator housing.
The rear refrigerant system must be discharge
prior to removing the rear A/C low pressure switch.
OPERATION
The rear A/C low pressure switch is electrically
connected in series with the rear A/C high pressure
switch, between ground and the rear A/C control
module.
The rear A/C low pressure switch contact opens or
closes the path the ground, signaling the rear A/C
control module to turn the rear A/C clutch on and off.
This regulates the rear refrigerant system pressure
and controls rear A/C evaporator temperature. Con-
trolling the rear evaporator temperature prevents
condensate water on the evaporator fins from freez-
ing and obstructing rear A/C system air flow.
The rear A/C low pressure switch contacts are open
when the rear suction line pressure is approximately
152 kPa (22 psi) or lower. The rear A/C low pressure
switch contacts will close when the rear suction line
pressure rises to approximately 234 to 262 kPa (34 to
38 psi) or above. Lower ambient temperatures, belowapproximately -1É C (30É F), will also cause the rear
A/C low pressure switch contacts to open due to the
pressure/temperature relationship of the refrigerant
in the system.
The rear A/C low pressure switch is factory-cali-
brated and cannot be adjusted or repaired and, if
faulty or damaged, it must be replaced. Refer to the
appropriate wiring information for complete HVAC
wiring diagrams.
REMOVAL
WARNING: Refer to the applicable warnings and
cautions for this system before performing the fol-
lowing operation (Refer to 24 - HEATING & AIR
CONDITIONING/PLUMBING - WARNINGS) and (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMBING -
CAUTIONS). Failure to follow the warnings and cau-
tions could result in possible personal injury or
death.
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the cover from the rear A/C evaporator
housing (Refer to 24 - HEATING & AIR CONDI-
TIONING/DISTRIBUTION - REAR/A/C EVAPORA-
TOR COVER-REAR - REMOVAL).
(3) Recover the refrigerant from the rear refriger-
ant system (Refer to 24 - HEATING & AIR CONDI-
TIONING/PLUMBING - STANDARD PROCEDURE -
REFRIGERANT RECOVERY).
(4) Remove the insulating tape from around the
area of the rear A/C low pressure switch (Fig. 10).
(5) Disconnect the wire harness connector from the
rear A/C low pressure switch.
(6) Remove the rear A/C low pressure switch and
install a plug into, or tape over the opened rear suc-
tion line fitting.
Fig. 9 Rear A/C Low Pressure Switch
1 - REAR PRESSURE SWITCH
2 - WIRE CONNECTOR
24 - 32 CONTROLS - REARVA

Page 2070 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual INSTALLATION
NOTE: Replacement of the PTFE thread sealing
tape is required anytime the rear A/C low pressure
switch is removed from the rear suction line line.
Failure to replace the sealing tape coul

INSTALLATION
NOTE: Replacement of the PTFE thread sealing
tape is required anytime the rear A/C low pressure
switch is removed from the rear suction line line.
Failure to replace the sealing tape could result in a
rear refrigerant system leak.
(1) Remove the tape or plug from the rear suction
line fitting.
(2) Install PTFE thread sealing tape onto the rear
A/C low pressure switch and install the switch onto
the rear suction line. Tightened the A/C low pressure
switch to 10 N´m (88 in. lbs.).
(3) Connect the wiring harness connector to the
rear A/C low pressure switch.
(4) Install new insulating tape around the rear A/C
low pressure switch area.
(5) Reconnect the negative battery cable.
(6) Evacuate the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
(7) Charge the rear refrigerant system (Refer to 24
- HEATING & AIR CONDITIONING/PLUMBING -
STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).
(8) Install the cover onto the rear A/C evaporator
housing (Refer to 24 - HEATING & AIR CONDI-
TIONING/DISTRIBUTION - REAR/A/C EVAPORA-
TOR COVER-REAR - INSTALLATION).
BLOWER MOTOR RELAY
DESCRIPTION
The three rear blower motor relays used for the
rear A/C system are International Standards Organi-
zation (ISO)-type relays (Fig. 11). Relays conforming
to the ISO specifications have common physical
dimensions, current capacities, terminal functions
and patterns. The rear blower motor relays are elec-
tromechanical devices that switches fused battery
current directly to the rear blower motors. The rear
blower motor relays are energized when the relay
coils are provided battery current by the rear blower
motor switch (Refer to 24 - HEATING & AIR CON-
DITIONING/CONTROLS/BLOWER MOTOR
SWITCH - DESCRIPTION).
The rear blower motor relays are located in the
relay block in the rear A/C evaporator housing.
OPERATION
The three ISO-standard rear blower motor relays
are electromechanical switches that uses a low cur-
rent input from the rear blower motor switch to con-
trol the high current output to the rear blower
motors. The movable, common feed relay contact is
held against the fixed, normally closed relay contact
by spring pressure. When the electromagnetic relay
coil is energized, it draws the movable common feed
relay contact away from the fixed, normally closed
relay contact and, holds it against the fixed, normally
open relay contact. This action allows high current to
flow to the rear blower motors.
When the relay coil is de-energized, spring pres-
sure returns the movable relay contact back against
the fixed, normally closed contact point. The resistor
Fig. 10 Rear A/C Low Pressure Switch
1 - INSULATING TAPE
2 - REAR A/C EVAPORATOR HOUSING
3 - WIRE HARNESS CONNECTOR
4 - REAR A/C LOW PRESSURE SWITCH
5 - REAR SUCTION LINE FITTING
Fig. 11 Rear Blower Motor Relays
1 - STANDARD ISO RELAY
2 - TERMINAL PATTERN
VACONTROLS - REAR 24 - 33

Page 2071 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual or diode is connected in parallel with the relay coil,
and helps to dissipate voltage spikes and electromag-
netic interference that can be generated as the elec-
tromagnetic field of the relay coil c

Page 2072 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual INSTALLATION
(1) Position the rear blower motor relays into the
proper receptacle of the relay block located in the
rear A/C evaporator housing as necessary.
(2) Align the blower motor relay terminals

Load next 8 pages

Page: < prev 1-10 ... 2033-2040 2041-2048 2049-2056 2057-2064 2065-2072 2073-2080 2081-2088 2089-2096 2097-2104 ... 2312 next >

horn trunk clutch tire pressure reset fuse chart octane