Nissan Murano Z50 (2003 year). Manual - part 11

HEATER & COOLING UNIT ASSEMBLY

ATC-139

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision; 2004 April

2003 Murano

11. Remove mounting screws from heater & cooling unit.

12. Remove the steering member, and then remove heater & cool-

ing unit.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings for A/C piping with new one, then apply compressor oil to it when installing it.

●

Connection point for female-side piping is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert in axial direction.

●

Insert one-touch joint connection point securely until it clicks.

●

After piping has been connected, pull male-side piping by hand to check that piping does not
come off.

●

When recharging refrigerant, check for leaks.

NOTE:

●

When filling radiator with coolant, refer to 

CO-8, "Changing Engine Coolant"

 .

●

Recharge the refrigerant.

RJIA1827E

RJIA1828E

Heater & cooling unit mounting bolt

Tightening torque

: 5.98 - 7.65 N·m (0.61 - 0.78 kg-m, 53 - 67 in - lb)

Steering member mounting nut and bolt

Tightening torque

: 11 - 13 N·m (1.1 - 1.4 kg-m, 8.2 - 9.5 ft - lb)

ATC-140

HEATER & COOLING UNIT ASSEMBLY

Revision; 2004 April

2003 Murano

Disassembly and Assembly

AJS00101

1.

Adaptor duct

2.

Heater  & cooling case (left)

3.

Mode door motor bracket

4.

Mode door motor

5.

Instrument lower cover bracket

6.

Aspirator

7.

Aspirator duct

8.

Sub harness

9.

Heater core

10. Foot duct (right)

11.

Heater core cover

12. Air mix door motor (passenger side)

13. Evaporator cover

14. Low-pressure pipe 2

15. High-pressure pipe 2

16. Cooler grommet

17. Heater & cooling case (right)

18. Insulator

RJIA1829E

HEATER & COOLING UNIT ASSEMBLY

ATC-141

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision; 2004 April

2003 Murano

19. Air mix door motor (driver side)

20. Defroster door lever

21. Max. cool door lever

22. Main link

23. Ventilator door lever

24. Ventilator door link

25. Foot duct (left)

26. Ventilator door

27. Heater pipe support

28. Intake sensor

29. Intake sensor bracket

30. Adaptor cover

31. Expansion valve

32. Evaporator

33. Defroster door

34. Defroster door link

35. Max. cool door link

36. Max. cool door (left)

37. Center case

38. Heater pipe grommet

39. Air mix door

40. Max. cool door (right)

ATC-142

MODE DOOR MOTOR

Revision; 2004 April

2003 Murano

MODE DOOR MOTOR

PFP:27731

Removal and Installation

AJS00102

REMOVAL

1.

Remove BCM. Refer to 

BCS-36, "Removal and Installation of BCM"

 .

2.

Remove mounting screws from mode door motor.

3.

Disconnect mode door connector, and then remove mode door
motor.

INSTALLATION

Installation is basically the reverse order of removal.

RJIA1830E

AIR MIX DOOR MOTOR

ATC-143

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision; 2004 April

2003 Murano

AIR MIX DOOR MOTOR 

PFP:27732

Removal and Installation

AJS00103

REMOVAL
Driver Side

1.

Set the temperature at 18

°

C (60

°

F), and then disconnect the battery negative cable.

2.

Remove instrument driver lower panel. Refer to 

IP-11, "Removal and Installation"

 .

3.

Remove air mix door motor.

4.

Disconnect air mix door motor connector.

Passenger Side

1.

Set the temperature at 18

°

C (60

°

F), and then disconnect the battery negative cable. 

2.

Remove blower unit. Refer to 

ATC-133, "BLOWER UNIT"

 .

3.

Remove air mix door motor.

4.

Disconnect air mix door motor connector.

INSTALLATION

Installation is basically the reverse order of removal.

RJIA1831E

RJIA1832E

ATC-144

HEATER CORE

Revision; 2004 April

2003 Murano

HEATER CORE

PFP:27140

Removal and Installation

AJS0016C

REMOVAL

1.

Remove heater & cooling unit. Refer to 

ATC-138, "HEATER & COOLING UNIT ASSEMBLY"

 .

2.

Remove foot duct (right). Refer to 

ATC-148, "Removal of Foot Ducts"

 .

3.

Remove heater core cover.

4.

Remove heater pipe support and heater pipe grommet.

5.

Slide heater core to passenger side.

INSTALLATION

Installation is basically the reverse order of removal.

RJIA1865E

DUCTS AND GRILLES

ATC-145

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision; 2004 April

2003 Murano

DUCTS AND GRILLES

PFP:27860

Removal and Installation

AJS00104

REMOVAL

Removal of Center Ventilator Grille

1.

Remove center ventilator. Refer to 

IP-11, "Removal and Installa-

tion"

 .

2.

Remove center ventilator grille.

Removal of Side Ventilator Grille

1.

Remove side ventilator assembly. Refer to 

IP-11, "Removal and

Installation"

 .

2.

Remove side ventilator grille.

1.

Defroster nozzle

2.

Side defroster duct (left)

3.

Ventilator duct

4.

Side defroster grille (left)

5.

Side ventilator grille (left)

6.

Center ventilator grille (left)

7.

Center ventilator grille (right)

8.

Side ventilator grille (right)

9.

Instrument panel

10. Side defroster grille (right)

11. Side defroster duct (right)

RJIA1833E

RJIA1834E

RJIA1835E

ATC-146

DUCTS AND GRILLES

Revision; 2004 April

2003 Murano

Removal of Rear Ventilator Grille

1.

Remove center pillar lower garnish. Refer to 

EI-32, "CENTER

PILLAR LOWER GARNISH"

 .

2.

Remove mounting clips, then remove rear ventilator grille.

Removal of Defroster Nozzle, Ducts and Ventilator Ducts

1.

Remove instrument panel assembly. Refer to 

IP-11, "Removal and Installation"

 .

2.

Remove side defroster ducts, using power tools.

3.

Remove defroster nozzle, using power tools.

4.

Remove ventilator duct., using power tools.

Removal of Side Defroster Grille

1.

Remove instrument side finisher. Refer to 

IP-11, "Removal and

Installation"

 .

2.

Remove side defroster grilles.

RJIA1836E

RJIA1837E

RJIA1838E

DUCTS AND GRILLES

ATC-147

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision; 2004 April

2003 Murano

Removal of Rear Ventilator Ducts

1.

Remove center console. Refer to 

IP-18, "Removal and Installation"

 .

2.

Slide rear ventilator duct 2 toward vehicle rear, then remove it.

3.

Remove rear ventilator duct 1.

4.

Remove floor carpet. Refer to 

EI-34, "Removal and Installation"

 .

5.

Remove rear ventilator duct 3 fixing screws, then remove rear ventilator duct 3.

RJIA1839E

RJIA1840E

ATC-148

DUCTS AND GRILLES

Revision; 2004 April

2003 Murano

Removal of Foot Ducts

1.

Remove instrument driver lower panel. Refer to 

IP-11, "Removal and Installation"

 .

2.

Remove foot duct (driver side).

3.

Remove blower unit. Refer to 

ATC-133, "BLOWER UNIT"

 .

4.

Remove foot duct (passenger side).

Removal of Floor Ducts

1.

Remove front seats and center console. Refer to 

SE-122, "FRONT SEAT"

  and 

IP-17, "CENTER CON-

SOLE ASSEMBLY"

 .

2.

Slide front floor duct downward, then remove it.

3.

Peel back the floor carpet to a point where the floor duct is visi-
ble.

4.

Remove mounting clip, and then remove the floor ducts.

INSTALLATION

Installation is basically the reverse order of removal.

RJIA1841E

RJIA1842E

RJIA1843E

RJIA1844E

REFRIGERANT LINES

ATC-149

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision; 2004 April

2003 Murano

REFRIGERANT LINES

PFP:92600

HFC-134a (R-134a) Service Procedure

AJS00105

SETTING OF SERVICE TOOLS AND EQUIPMENT
Discharging Refrigerant

WARNING:

Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from A/C system using certified service equipment meeting
requirements of SAE J2210 HFC-134a (R-134a) recycling equipment or J2201 HFC-134a (R-134a)
recovery equipment. If accidental system discharge occurs, ventilate work area before resuming ser-
vice. Additional health and safety information may be obtained from refrigerant and lubricant manu-
facturers.

Evacuating System and Charging Refrigerant

SHA179FD

SHA180FD

ATC-150

REFRIGERANT LINES

Revision; 2004 April

2003 Murano

*1

 

ATC-22, "LUBRICANT RETURN 

OPERATION"

*2

ATC-166, "Checking for Refrigerant 
Leaks"

*3

 

ATC-168, "CHECKING PROCE-

DURE"

*4

 

ATC-105, "PERFORMANCE TEST 

DIAGNOSES"

*5

ATC-6, "CONTAMINATED REFRIG-
ERANT"

RJIA1878E

REFRIGERANT LINES

ATC-151

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision; 2004 April

2003 Murano

Components

AJS00106

Refer to 

ATC-8, "Precautions for Refrigerant Connection"

 .

RJIA1845E

ATC-152

REFRIGERANT LINES

Revision; 2004 April

2003 Murano

Removal and Installation of Compressor

AJS00107

REMOVAL

1.

Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.

2.

Remove the air duct (inlet). Refer to 

EM-14, "AIR CLEANER AND AIR DUCT"

 .

3.

Remove the engine undercover, using power tools.

4.

Remove mounting nuts from the low-pressure flexible hose and
high-pressure flexible hose.

CAUTION:

Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air. 

5.

Disconnect compressor (magnet clutch) connector.

6.

Remove the A/C compressor belt. Refer to 

EM-11, "DRIVE

BELTS"

 .

7.

Remove the idler pulley bracket.

RJIA1846E

RJIA1847E

RJIA1848E

REFRIGERANT LINES

ATC-153

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision; 2004 April

2003 Murano

8.

Remove mounting bolts from compressor, using power tools.

9.

Remove compressor from passenger side of the vehicle.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace the O-ring of the low-pressure flexible hose, high-pressure pipe and high-pressure flexi-
ble hose with a new one, then apply compressor oil to it when installing it.

●

When recharging refrigerant, check for leaks.

Removal and Installation of Compressor Clutch

AJS00108

REMOVAL
Overhaul

1.

When removing center bolt, hold clutch disc with wrench.

2.

Remove clutch disc.

RJIA1849E

Bolts mounting the compressor (Front side)

Tightening torque

: 28.4 - 33.3 N·m (2.9 - 3.3 kg-m, 21 - 24 ft-lb)

Nut mounting the compressor

Tightening torque

: 56.9 - 65.7 N·m (5.8 - 6.7 kg-m, 42 - 48 ft-lb)

Bolts mounting the compressor (Rear side)

Tightening torque

: 56.9 - 65.7 N·m (5.8 - 6.7 kg-m, 42 - 48 ft-lb)

Nut mounting the high-pressure flexible hose

Tightening torque

: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)

Nut mounting the low-pressure flexible hose

Tightening torque

: 7.8 - 19.6 N·m (0.8 - 1.9 kg-m, 69 - 173 in-lb)

Bolts mounting the idler pulley bracket

Tightening torque

: 24.5 - 31.4 N·m (2.5 - 3.2 kg-m, 18 - 23 ft-lb)

RJIA1879E

ATC-154

REFRIGERANT LINES

Revision; 2004 April

2003 Murano

3.

Remove the snap ring using external snap ring pliers.

4.

Position the center pulley puller on the end of the drive shaft,
and remove the pulley assembly using any commercially avail-
able pulley puller.
To prevent the pulley groove from being deformed, the puller
claws should be positioned into the edge of the pulley assembly.

5.

Remove field coil mounting screws.

6.

Remove compressor connector from connector bracket.

Inspection

Clutch disc
If the contact surface shows signs of damage due to excessive heat,
replace clutch disc and pulley.

Pulley
Check the appearance of the pulley assembly. If the contact surface
of pulley shows signs of excessive grooving, replace clutch disc and
pulley. The contact surfaces of the pulley assembly should be
cleaned with a suitable solvent before reinstallation.

Coil

Check coil for loose connection or cracked insulation.

RJIA1880E

RJIA1881E

RJIA1882E

RJIA1883E