2006 MERCEDES-BENZ SPRINTER ECU

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 expansion valve (Fig. 25).
(5) Disconnect the equalizer tube from the rear
evaporator outlet tube.
(6) Disconnect the rear liquid line from the rear
A/C expansion valve and remove and discard the
O-ring seal.
(7) Disconnect the rear A/C expansion valve from
the rear evaporator inlet tube and remove and dis-
card the O-ring seal.
(8) Remove the retaining clamp that secures the
sensor bulb to the evaporator outlet tube and remove
the expansion valve, capillary tube and sensor bulb
as an assembly.
(9) Install plugs into, or tape over the opened
refrigerant line and evaporator tube fittings and
expansion valve ports.
24 - 86 PLUMBINGVA

INSTALLATION
(1) Remove the tape or plugs from the rear refrig-
erant line and evaporator tube fittings and the rear
expansion valve ports.
(2) Lubricate a new O-ring seal with clean refrig-
erant oil and install it onto the rear evaporator inlet
tube fitting. Use only the specified O-ring seal as it is
made of a special material for the R-134a system.
Use only refrigerant oil of the type recommended for
the rear A/C compressor in the vehicle.
(3) Install the rear A/C expansion valve onto the
rear evaporator inlet tube. Tighten the nut to 35 N´m
(26 ft. lbs.).
(4) Lubricate a new O-ring seal with clean refrig-
erant oil and install it onto the rear liquid line fit-
ting. Use only the specified O-ring seal as it is made
of a special material for the R-134a system. Use only
refrigerant oil of the type recommended for the rear
A/C compressor in the vehicle.
(5) Connect the rear liquid line to the rear A/C
expansion valve. Tighten the nut to 35 N´m (26 ft.
lbs.).(6) Connect the equalizer tube to the rear evapora-
tor outlet tube. Tighten the nut to 10 N´m (88 in.
lbs.).
(7) Position the rear expansion valve sensing bulb
onto the rear evaporator outlet tube and install the
retaining clamp securely.
(8) Install new insulating tape around the rear A/C
expansion valve area.
(9) Reconnect the negative battery cable.
(10) Evacuate the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
(11) Charge the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).
(12) 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).
Fig. 25 Rear A/C Expansion Valve
1 - INSULATING TAPE
2 - REAR LIQUID LINE
3 - REAR A/C EXPANSION VALVE
4 - REAR A/C EVAPORATOR INLET TUBE5 - RETAINING CLAMP
6 - SENSING BULB AND CAPILLARY TUBE
7 - EQUALIZER TUBE
8 - REAR A/C EVAPORATOR OUTLET TUBE
VAPLUMBING 24 - 87

REAR DISCHARGE LINE
DESCRIPTION
The rear A/C discharge line is the refrigerant line
that carries refrigerant from the underbody discharge
line to the rear A/C condenser (Fig. 26). The rear A/C
discharge line is retained to the right quarter panel
by two plastic retaining clips.
CAUTION: Use only seals specified for the vehicle.
Failure to use the correct seals will cause the refrig-
erant system connections to leak.
The rear A/C discharge line has no serviceable
parts except for the O-ring seals. The O-ring seals
used on the connections are made from a special type
of rubber not affected by R-134a refrigerant and
must be replaced whenever the rear discharge line is
removed and installed.
If the rear A/C discharge line is found to be leaking
or damaged, it must be replaced.
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 cover from the rear A/C condenser
housing (Refer to 24 - HEATING & AIR CONDI-
TIONING/DISTRIBUTION - REAR/A/C CON-
DENSER COVER - REMOVAL).
(5) Remove the screw and bracket that secures the
rear A/C discharge line to the right side of the rear
A/C condenser housing (Fig. 27).
(6) Disconnect the rear A/C discharge line from the
rear A/C condenser and remove and discard the
O-ring seal.
(7) Disengage the discharge line grommet from the
roof panel and push the grommet down into the
cargo compartment.
(8) Remove the right quarter trim panel (Refer to
23 - BODY/INTERIOR/QUARTER TRIM PANEL -
REMOVAL).
(9) Remove the retaining strap that secures the
rear A/C wire harness to the rear A/C discharge line
at the ceiling and position the wire harness out of
the way (Fig. 28).
Fig. 26 Rear A/C Discharge Line
1 - REAR A/C DISCHARGE LINE
2 - RETAINING CLIPS
3 - TO REAR A/C CONDENSER
4 - RIGHT INNER QUARTER PANEL
5 - TO UNDERBODY DISCHARGE LINEFig. 27 Rear A/C Discharge Line to Rear Condenser
1 - REAR A/C CONDENSER
2 - GROMMET
3 - REAR A/C DISCHARGE LINE
4 - CONDENSER INLET TUBE
5 - SCREW AND BRACKET
24 - 88 PLUMBINGVA

INSTALLATION
(1) Remove the tape or plugs from the rear dis-
charge and underbody line fittings and the rear con-
denser tube.
(2) Lubricate new O-ring seals with clean refriger-
ant oil and install them onto the rear discharge line
fittings. Use only the specified O-ring seals as they
are made of a special material for the R-134a system.
Use only refrigerant oil of the type recommended for
the rear A/C compressor in the vehicle.
(3) From underneath the vehicle, route the rear
A/C discharge line into the cargo compartment and
install it into the two retaining clips located under
the vehicle.
(4) Connect the rear A/C discharge line to the
underbody discharge line. Tighten the nut to 35 N´m
(26 ft. lbs.).
(5) Install the foam rubber seal into the floor
panel.
(6) From inside the vehicle, install the rear A/C
discharge line into the two retaining clips located on
the inner quarter panel and route the discharge line
through the opening in the roof.
(7) Seat the grommet to the roof panel and install
a new rear A/C wire harness retaining strap.
(8) Install the three foam insulators to the right
inner quarter panel.(9) Install the right quarter trim panel (Refer to
23 - BODY/INTERIOR/QUARTER TRIM PANEL -
INSTALLATION).
(10) Connect the rear discharge line to the rear
A/C condenser. Tighten the nut to 35 N´m (26 ft.
lbs.).
(11) Install the bracket and screw that secures the
rear discharge line to the right side of the rear con-
denser housing. Tighten the screw securely.
(12) Reconnect the negative battery cable.
(13) Evacuate the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
(14) Charge the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).
(15) 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).
(16) 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. 29 Rear A/C Discharge Line to Underbody
1 - REAR A/C DISCHARGE LINE
2 - RETAINING CLIPS
3 - TO REAR CONDENSER
4 - FOAM RUBBER SEAL
5 - BRACKETS6 - UNDERBODY DISCHARGE LINE
7 - RIGHT INNER QUARTER PANEL
8 - FOAM INSULATORS
9 - TO UNDERBODY
24 - 90 PLUMBINGVA

REAR LIQUID LINE
DESCRIPTION
The rear liquid line is the refrigerant line that car-
ries refrigerant from the rear condenser to the rear
A/C expansion valve. The rear A/C liquid line on this
vehicle is serviced in two sections (Fig. 30).
CAUTION: Use only seals specified for the vehicle.
Failure to use the correct seals will cause the refrig-
erant system connections to leak.
The rear A/C liquid lines have no serviceable parts
except for the O-ring seals. The O-ring seals used on
the connections are made from a special type of rub-
ber not affected by R-134a refrigerant and must be
replaced whenever the rear liquid line is removed
and installed.
If either of the rear liquid lines is found to be leak-
ing or damaged, it must be replaced.
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.CONDENSER TO RECEIVER / DRIER
(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 rear liquid line from the rear
receiver/drier and remove and discard the O-ring seal
(Fig. 31).
(6) Disconnect the rear liquid line from the rear
condenser and remove and discard the O-ring seal.
(7) Remove the retaining straps that secure the
rear A/C wire harness to the rear liquid line and
remove the liquid line.
(8) Install plugs into, or tape over the opened rear
liquid line fittings and receiver/drier and condenser
ports.
Fig. 30 Rear A/C Liquid Lines
1 - REAR A/C CONDENSER
2 - REAR LIQUID LINE (FROM CONDENSER)
3 - REAR RECIEVER/DRIER AND RESERVOIR
4 - REAR LIQUID LINE (TO EXPANSION VALVE)
VAPLUMBING 24 - 91

INSTALLATION
CONDENSER TO RECEIVER / DRIER
(1) Remove the tape or plugs from the rear liquid
line fittings and receiver/drier and condenser ports.
(2) Lubricate new O-ring seals with clean refriger-
ant oil and install them onto the rear liquid line fit-
tings. Use only the specified O-ring seals as they are
made of a special material for the R-134a system.
Use only refrigerant oil of the type recommended for
the rear A/C compressor in the vehicle.
(3) Connect the rear liquid line to the rear receiv-
er/drier. Tighten the nut to 35 N´m (26 ft. lbs.).
(4) Connect the rear liquid line to the rear A/C
condenser. Tighten the nut to 35 N´m (26 ft. lbs.).
(5) Install the retaining straps that secure the rear
A/C wire harness to the rear liquid line.
(6) Reconnect the negative battery cable.
(7) Evacuate the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
(8) Charge the rear refrigerant system (Refer to 24
- HEATING & AIR CONDITIONING/PLUMBING -
STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).
(9) Install the rear air filter (Refer to 24 - HEAT-
ING & AIR CONDITIONING/DISTRIBUTION -
REAR/AIR FILTER - INSTALLATION).(10) 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).
RESERVOIR TO EXPANSION VALVE
(1) Remove the tape or plugs from the rear liquid
line fittings and the reservoir and expansion valve
ports.
(2) Lubricate new O-ring seals with clean refriger-
ant oil and install them onto the rear liquid line fit-
tings. Use only the specified O-ring seals as they are
made of a special material for the R-134a system.
Use only refrigerant oil of the type recommended for
the rear A/C compressor in the vehicle.
(3) Connect the rear liquid line to the rear A/C
expansion valve. Tighten the nut to 35 N´m (26 ft.
lbs.).
(4) Route the liquid line through the opening in
the roof and engage the grommet to the roof panel.
(5) Connect the rear liquid line to the rear refrig-
erant reservoir. Tighten the nut to 35 N´m (26 ft.
lbs.).
(6) Reconnect the negative battery cable.
(7) Evacuate the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
Fig. 32 Rear Liquid Line - Reservoir to Expansion Valve
1 - GROMMET
2 - LIQUID LINE (TO EXPANSION VALVE)3 - REAR REFRIGERANT RESERVOIR
4 - REAR A/C EXPANSION VALVE
VAPLUMBING 24 - 93

(8) Charge the rear refrigerant system (Refer to 24
- HEATING & AIR CONDITIONING/PLUMBING -
STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).
(9) 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).
(10) 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).
REAR RECEIVER / DRIER
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 rear refrigerant reservoir from
the rear receiver/drier and remove and discard the
O-ring seal (Fig. 33).
(6) Disconnect the liquid line from the rear receiv-
er/drier and remove and discard the O-ring seal.
(7) Remove the bolt and retaining bracket that
secures the rear receiver/drier to the rear A/C con-
denser housing and remove the receiver/drier.
(8) Install plugs into, or tape over the opened rear
liquid line fitting and reservoir and receiver/drier
ports.
INSTALLATION
NOTE: Be certain to add refrigerant oil if the rear
receiver/drier is being replaced. The refrigerant oil
must be drained from the old receiver/drier and
measured to determine the amount of refrigerant oil
to add to the new receiver/drier. Use only refriger-
ant oil of the type recommended for the rear A/C
compressor in the vehicle.
(1) If the rear receiver/drier is being replaced,
install the correct amount and type of refrigerant oil
into the new rear receiver/drier. Drain the old receiv-
er/drier and measure the refrigerant oil. Fill the new
receiver/drier with the same amount of new refriger-
ant oil that was drained out of the old receiver/drier.
NOTE: The rear receiver/drier is labeled with a
direction-of-flow arrow to indicate refrigerant flow
through the receiver/drier. Make sure to properly
install the rear receiver/drier in the correct direc-
tion.
(2) Position the rear receiver/drier to the rear A/C
condenser housing and install the retaining bracket
and bolt. Tighten the bolt to 25 N´m (18 ft. lbs.).
(3) Remove the tape or plugs from the rear liquid
line fitting and reservoir and receiver/drier ports.
(4) Lubricate a new O-ring seal with clean refrig-
erant oil and install it onto the rear liquid line fit-
ting. Use only the specified O-ring seal as it is made
of a special material for the R-134a system. Use only
Fig. 33 Rear Receiver/Drier
1 - REAR A/C CONDENSER HOUSING
2 - REFRIGERANT RESEVOIR
3 - REAR RECEIVER/DRIER
4 - BOLT
5 - LIQUID LINE
6 - RETAINING BRACKET
24 - 94 PLUMBINGVA

refrigerant oil of the type recommended for the rear
A/C compressor in the vehicle.
(5) Connect the rear liquid line to the rear receiv-
er/drier. Tighten the nut to 35 N´m (26 ft. lbs.).
(6) Lubricate a new O-ring seal with clean refrig-
erant oil and install it onto the receiver/drier outlet
fitting. Use only the specified O-ring seal as it is
made of a special material for the R-134a system.
Use only refrigerant oil of the type recommended for
the rear A/C compressor in the vehicle.
(7) Connect the rear refrigerant reservoir to the
rear receiver/drier. Tighten the nut to 35 N´m (26 ft.
lbs.).
(8) Reconnect the negative battery cable.
(9) Evacuate the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
(10) Charge the rear refrigerant system (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).
(11) Install the rear air filter (Refer to 24 - HEAT-
ING & AIR CONDITIONING/DISTRIBUTION -
REAR/AIR FILTER - INSTALLATION).
(12) 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).
REAR REFRIGERANT RESER-
VOIR
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 rear liquid line from the rear
refrigerant reservoir and remove and discard the
O-ring seal (Fig. 34).
(6) Disconnect the rear refrigerant reservoir from
the rear receiver/drier and remove and discard the
O-ring seal.
(7) Remove the bolt and retaining bracket that
secures the rear refrigerant reservoir to the rear A/C
condenser housing and remove the reservoir.
(8) Install plugs into, or tape over the opened rear
liquid line fitting and receiver/drier and reservoir
ports.
INSTALLATION
NOTE: Be certain to add refrigerant oil if the rear
refrigerant reservoir is being replaced. The refriger-
ant oil must be drained from the old refrigerant res-
ervoir and measured to determine the amount of
refrigerant oil to add to the new reservoir. Use only
refrigerant oil of the type recommended for the rear
A/C compressor in the vehicle.
(1) If the rear refrigerant reservoir is being
replaced, install the correct amount and type of
refrigerant oil into the new rear refrigerant reservoir.
Drain the old refrigerant reservoir and measure the
refrigerant oil. Fill the new refrigerant reservoir with
the same amount of new refrigerant oil that was
drained out of the old reservoir.
Fig. 34 Rear Refrigerant Reservoir
1 - REAR A/C CONDENSER HOUSING
2 - LIQUID LINE
3 - REAR REFRIGERANT RESERVOIR
4 - BOLT
5 - REAR RECEIVER/DRIER
6 - RETAINING BRACKET
VAPLUMBING 24 - 95