Verified System Malfunction Follow-Up

After verifying that the complaint is actually a system malfunction, make the following "basic" checks:

VISUAL CHECKS

- Coolant level, coolant hoses in perfect condition and all drive belts tensioned properly.
- A/C condenser radiator, and system microfilters clean and unobstructed.
- Auxiliary cooling fan operates with A/C on and rotates in the correct direction.
- Cabin flow-through ventilation functions correctly, vent flap valves behind rear bumper open with cabin overpressure.

DIS TESTER CHECKS

- Instrument cluster temperature gauge and Engine Control Module temperature value indicate engine coolant temperature is normal.
- IHKR/IHKA has no faults in memory and the system is not operating with stored substitute values.
- Water valves open/close correctly, heater core temperature sensors indicate that the heater cores cool down on system cue.
- Outlet flaps operate correctly, actual air discharge locations agree with tester- indicated flap open/closed positions.
- A/C compressor clutch energizes on system cue with engine running. (Many systems will not energize the compressor clutch with the ignition switched on, engine not running.)