Heating and A/C Components In Engine Compartment, Servicing

Heating And A/C Components In Engine Compartment, Servicing







CAUTION: Before beginning repairs on the electrical system:
- Obtain the anti-theft radio security code.
- Switch off all electrical consumers.
- Switch ignition off and remove ignition key.
- Disconnect negative (-) battery terminal.
- When disconnecting and reconnecting battery terminals, observe all applicable Notes and torque specifications, as well as instructions on performing OBD program and electrical system function checks.

NOTE:
- System components identified with * must only be serviced or replaced after discharging refrigerant system. Use Kent Moore ACR4 or equivalent.
- Illustration shows vehicle with engine code AHA.

1. Accumulator*
2. Refrigerant hose*
- Between evaporator and accumulator
3. Refrigerant hose*
- Between evaporator and condenser
4. Low pressure service valve*
5. High pressure service valve*
6. Dust and pollen filter
- Vehicles from 10.00, replacing
- Ambient temperature switch -F38- located below dust and pollen filter in lower air intake housing.
7. Evaporator*
- In heating and A/C unit.
- Removing/assembly.
8. Evaporator water drain valve
- Checking, see Fig. 1.
9. Pressure relief valve*
- Zexel compressor illustrated
- Checking, Zexel compressor
- Checking, Denso compressor
10. A/C compressor*
- A/C compressor and bracket removing/assembly.
11. A/C clutch -N25-
- Servicing: Zexel
- Servicing: Denso
12. Condenser*
- Removing/assembly.
13. A/C pressure switch -F129-
- Tightening torque 8 Nm (71 in lb)
- Replace O-ring (note Part No.).
Function:
- Switches coolant fan -V7- to next highest speed when pressure increases in refrigerant circuit.
- Switches off A/C clutch -N25- when refrigerant pressure is excessive (e.g.: insufficient engine cooling).
- Switches off A/C clutch -N25- when refrigerant pressure is too low (e.g.: refrigerant loss).
- Checking.
- Replacing from 10.00, see Fig. 5.
14. Refrigerant hose*
- Between compressor and condenser
15. Refrigerant hose*
- Between compressor and accumulator.







Fig. 1 Evaporator water drain valve, checking

Check drain valve as follows:
- Remove nuts -arrows- on right catalytic converter heat shield -1-
- Remove catalytic converter heat shield.

NOTE: Catalytic converter heat shield from from 10.00 differs from illustration as well as access to valve for checking.

Check valve as follows to ensure proper function:
- The valve must not be stuck together.
- The opening in the sealing cap of the valve must point downwards.
- The right catalytic converter heat shield plate must not be deformed or damaged in the area of the valve.







- Remove valve -1- from bulkhead -2-.
- The valve sealing lip -1- must cover the water drain guide outlet completely.