Housing Assembly HVAC: Service and Repair

HEATER & COOLING UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY : Removal and Installation


CAUTION:
Perform lubricant return operation before each refrigeration system disassembly. However, if a large amount of refrigerant or lubricant is detected, never perform lubricant return operation. Perform Lubricant Return Operation.

REMOVAL

1.Set the temperature at full cold.

CAUTION:
The angle may be out, when installing the air mix door motor to the air mix door, unless the above procedure is performed.
2.Disconnect the battery cable from the negative terminal.
3.Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant. Recycle Refrigerant.
4.Drain engine coolant from cooling system. Draining Engine Coolant.
5.Remove cowl top cover. Exploded View.





6.Disconnect one-touch joint between high-pressure pipe (1) and high-pressure evaporator pipe (2) with disconnector (SST: J45815).

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.Disconnect one-touch joint between low-pressure pipe (3) and low-pressure evaporator pipe (4) with disconnector (SST: J45815) (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.
8.Remove fixing clamps (A), and then disconnect heater hoses (1).





9.Remove ventilator duct. Exploded View.
10.Remove foot grille LH and RH. Exploded View.
11.Move steering column assembly to a position where it dose not inhibit work. Exploded View.
12.Remove instrument stay LH and RH.





13.Remove fixing clamp (A), and then disconnect drain hose (1).
14.Remove mounting nuts (A), and then remove ECM (1).
15.Remove mounting bolt (B) and fixing screws (C), and then remove blower unit (2).
16.Remove mounting bolts (D), fixing screws (E) and ground bolts (F).





17.Disconnect the harness connectors and clips required to remove the steering member, and then move the vehicle harness to the position without hindrance for work.
18.Remove mounting bolts (A), and then remove steering member (1).





19.Remove heater & cooling unit assembly from the vehicle.

INSTALLATION

Note the following items, and then 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 check that connection does not come loose.
- Check for leakages when recharging refrigerant. Leak Test.
NOTE:
Refilling Engine Coolant when filling radiator with engine coolant.