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. Changing Engine Coolant (VQ35HR) or Changing Engine Coolant (VK45DE).
3. Remove cowl top cover. Locations.
4. Remove engine cover. Removal and Installation (VQ35HR) or Removal and Installation (VK45DE).





5. Disconnect one-touch joint between low-pressure pipe 1 (1) and low-pressure pipe 2 (2) (VQ35HR) or low-presure flexible hose
(2) (VK45DE) with disconnector (SST: 9253089916) (A).

CAUTION:
Cap or wrap the joint of the A/C piping with suitable material such as vinyl tape to avoid the entry of air.
6. Disconnect one-touch joint between high-pressure pipe 1 (3) and high-pressure pipe 2 (4) with disconnector (SST:
9253089908).

CAUTION:
Cap or wrap the joint of the A/C piping with suitable material such as vinyl tape to avoid the entry of air.
7. Remove clamps (A), and then disconnect heater hoses (1). (VQ35HR)





8. Remove clamps, and then disconnect heater hoses. (VK45DE)





9. Remove instrument panel & pad. Instrument Panel.
10. Remove blower unit. Removal and Installation.
11. Remove clips of vehicle harness from steering member.
12. Remove mounting nuts and bolts, and then remove instrument stays.










13. Disconnect drain hose.





14. Remove mounting bolts from heater & cooling unit.
15. Remove side defroster nozzles.





16. Remove steering column assembly mounting bolts and nut.
17. Remove steering member mounting bolts.
18. Remove steering member, and then remove heater & cooling unit.

INSTALLATION
Installation is basically the reverse order of removal.

CAUTION:
- Replace O-rings with new ones. Then apply compressor oil to them when installing.
- 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 check that connection does not come loose.
- Check for leakages when recharging refrigerant.

NOTE:
- When filling radiator with coolant, Changing Engine Coolant (VQ35HR) or (VK45DE).
- Recharge the refrigerant.

Heater & cooling unit assembly mounting bolt : 6.9 Nm (0.7 kg-m, 61 in-lb)
Instrument stay mounting nut and bolt : 12 Nm (1.2 kg-m, 9 ft-lb)