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 the ignition off.
- Disconnect the battery Ground (GND) strap.
- After reconnecting battery, re-code and check operation of anti-theft radio. Also check operation of clock and power windows.


NOTE:
- System components marked with an asterisk * can only be serviced or replaced after discharging refrigerant system. Use Kent Moore ACR4 or equivalent.
- Before carrying out any work on the A/C refrigerant system, refer to A/C refrigerant system safety measures.


1 - Damper with low pressure service valve*
- In refrigerant hose from expansion valve to compressor.
- Only use Kent Moore ACR4 or equivalent
2 - Refrigerant hose*
- From expansion valve to compressor
- With damper
3 - Refrigerant pipe*
- From receiver dryer to expansion valve
4 - High pressure service valve*
- Only use Kent Moore ACR4 or equivalent
5 - A/C pressure switch -F129- or high pressure sensor -G65-
- A/C pressure switch or sensor can be removed without discharging refrigerant system.
- Tightening torque 8 Nm (71 in. lb)
- Always replace O ring (note Part No.).
- -G65- is monitored by On Board Diagnostics of Engine Control Module (ECM).
Function:
- -F129- switches coolant fan -V7- to the next higher speed when pressure increases in refrigerant circuit.
- -F129- switches off A/C clutch whenever excessive refrigerant system pressure is present (e.g.: insufficient air flow over condenser or if system is overcharged).
- -F129- switches off A/C clutch whenever insufficient refrigerant system pressure is present (e.g.: refrigerant has leaked out).
- -G65- supplies refrigerant system pressure signal to the coolant fan control module - J293- and engine control module.
6 - Expansion valve*
7 - Dust and pollen filter
- With activated charcoal filter
8 - Ambient temperature switch -F38-
- Switches off A/C clutch - N25- at low outside temperatures.
- Off at -1 °C (30 °F).
- On at +7 °C (45 °F).
9 - A/C cut-out thermal switch -F163- >05.99
- Switches off A/C clutch - N25- at excessively high coolant temperatures.
- Off at 119 °C (246 °F)
- On at 112 °C (234 °F).


NOTE: -F163- deleted from 05.99 >. Thermal cut-out function assumed by Engine Coolant Temperature (ECT) Sensor -G62- via Engine Control Module (ECM).


10 - Evaporator water drain valve
11 - Coolant fan (FC) control module -J293-
12 - Refrigerant hose*
- From expansion valve to compressor
- With damper
13 - Refrigerant hose*
- From compressor to condenser
14 - Condenser*
15 - Pressure relief valve*
16 - Compressor*
- Manufacturer: Sanden, designation: SD7V16
- Manufacturer: Zexel, designation: DCW-17D
17 - A/C clutch -N25-
18 - Receiver drier*

Fig. 1 Evaporator water drain valve, checking







- Fold cover -1- in bulkhead insulation mat -3- upwards.
- Remove drain valve -2- from opening in bulkhead -4-.

Check water drain valve as follows:
- The water drain valve must not be stuck.
- Insulation mat must not be deformed or damaged in area of valve.
- The opening in the sealing cap of the water drain valve must point down.


NOTE: When the cover cap -1- is closed, it must be flush with the insulation matting. If the cover cap -1- is pushed in too far, the water drain valve sealing cap -2- can jam.