Removal and Installation

HEATER & COOLING UNIT ASSEMBLY

Removal and Installation

REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Drain coolant from cooling system. Refer to "Changing Engine Coolant" (VQ35DE) or "Changing Engine Coolant" (VK45DE).
3. Remove cowl top cover. Refer to "COWL TOP".




4. Disconnect low-pressure flexible hose and high-pressure pipe 1 from evaporator.
a. Set a disconnector [high-pressure side (SST: 9253089908), lowpressure side (SST: 9253089916)] on A/C piping.
b. Slide a disconnector toward vehicle front until it clicks.
c. Slide A/C piping toward vehicle front and disconnect it.

CAUTION: Cap or wrap the joint of low-pressure flexible hose, lowpressure pipe 1 and high-pressure pipe 1, 2 with suitable material such as vinyl tape to avoid the entry of air.

5. Remove electric throttle control actuator. Refer to "INTAKE MANIFOLD COLLECTOR" (VQ35DE) or "INTAKE MANIFOLD" (VK45DE).




6. Disconnect two heater hoses from heater core.
7. Remove instrument panel & pad. Refer to "INSTRUMENT PANEL ASSEMBLY".
8. Remove blower unit. Refer to "BLOWER UNIT".
9. Remove clips of vehicle harness from steering member.




10. Remove mounting nuts and bolts, and then remove instrument stays.




11. Disconnect drain hose.




12. Remove mounting bolts from heater & cooling unit.




13. Remove side defroster nozzles.
14. Remove steering column assembly mounting bolts and nut.
15. Remove steering member mounting bolts.
16. Remove steering member, and then remove heater & cooling unit.

INSTALLATION
Installation is basically the reverse order of removal.

CAUTION:
- Replace O-rings of low-pressure flexible hose and high-pressure pipe 1 with new ones, and then apply compressor oil to it when installing it.
- Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping straight in axial direction.
- Insert piping securely until a click is heard.
- After piping connection is completed, pull male-side piping by hand to make sure that connection does not come loose.
- When recharging refrigerant, check for leaks.

NOTE:
- When filling radiator with coolant, refer to "Changing Engine Coolant" (VQ35DE) or "Changing Engine Coolant" (VK45DE).
- Recharge the refrigerant.

Heater & cooling unit assembly mounting bolt
Torque: 6.9 N.m (0.7 kg-m, 61 in-lb)

Instrument stay mounting nut and bolt
Torque: 12 N.m (1.25 kg-m, 9 ft-lb)