Housing Assembly HVAC: Service and Repair

HEATER & COOLING UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY : Removal and Installation


REMOVAL

1.Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2.Drain engine coolant from cooling system. Draining Engine Coolant (VQ-37VHR models) or Draining Engine Coolant (VK-56VD models).
3.Remove cowl top cover. Removal And Installation.
4.Remove engine cover. Removal And Installation (VQ-37VHR models) or Removal And Installation (VK-56VD models).
5.Disconnect one-touch joint between evaporator pipe assembly and low-pressure pipe with disconnector (SST: J-45815).

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 evaporator pipe assembly and high-pressure pipe with disconnector (SST: J-45815).

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 clamp (A), and then disconnect heater hoses (1).





8.Remove instrument panel assembly. Removal And Installation.
9.Remove front defroster nozzle, side defroster nozzle and ventilator duct. Front Defroster Nozzle, Side Defroster Nozzle and Ventilator Duct.
10.Remove instrument stay.
11.Disconnect drain hose from heater & cooling unit assembly.
12.Remove mounting bolts from A/C unit assembly.
13.Remove harness connector, harness clips, and bracket necessary to remove steering member. Move vehicle harness aside.
14.Remove steering column mounting bolts and nuts. Removal And Installation.
15.Remove steering member mounting bolts.
16.Remove steering member from vehicle.
17.Remove A/C unit assembly from vehicle.
18.Separate blower unit and heater & cooling unit assembly

INSTALLATION

Note the following items, and install in 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 clicks is heard.
- After piping connection is completed, pull male-side piping by hand to make sure that connection never come loose.
- Check for leakages when recharging refrigerant. Leak Test.
NOTE:
- Refilling Engine Coolant (VQ-37VHR models) or Refilling Engine Coolant (VK-56VD models) when filling radiator with engine coolant.
- Recharge the refrigerant.