Test requirements
- Radiator and condenser are clean (clean, if necessary)
- Ribbed V-belt is in proper order and correctly tensioned
- All air guides, covers and seals in proper order and correctly installed
- Air flow through the two dust and pollen filters not restricted
- The vehicle is not directly exposed to the sun's rays
- Engine is at normal operating temperature
- With engine running, select the following A/C control head - E87- settings.
- "Auto" mode for driver and passenger sides
- "ECON" button not switched on (compressor switched on)
- "LO" temperature selection (driver and passenger sides)
- With engine running, select the following A/C control head - E87- settings.
- A/C compressor is driven (the A/C clutch is switched on)
- Radiator coolant fan -V7- runs (at least in stage 1).
- Fresh air blower -V2- runs at maximum speed.
- The air flow flap closes and recirculating air flap opens (about 1 minute after engine is started).
- The coolant pump -V50- does not run.
- Both left and right heat regulating valves (-N175- and - N176-) are closed (coolant hoses and coolant hoses to the heating system heater cores cool down).
NOTE:
- Testing heating performance of A/C system and operation of pump valve unit. See AUTOMATIC CLIMATE CONTROL SYSTEM HEATING PERFORMANCE AND OPERATION OF PUMP VALVE UNIT, TESTING .
- If one of the test requirements is not achieved, check DTC memory and perform output Diagnostic Test Mode (DTM). See OUTPUT DIAGNOSTIC TEST MODE (DTM) (FUNCTION 03) .