Test requirements: Notes
- Radiator and condenser clean (clean if necessary)
- Ribbed belt OK and correctly tensioned and drive plate actually drives compressor (6 and 8 cylinder gas engine).
- Compressor drive unit (connection between compressor and engine) is correctly installed (only Audi Allroad with 4.2 L engine, see COMPRESSOR DRIVE UNIT, CHECKING, REPLACING ).
- Air flow through dust and pollen filter not obstructed by dirt
- Air conditioner unit properly sealed (when fresh air blower is at maximum speed setting, no additional air is drawn in; air delivery is via vents only)
- Vehicle not standing in direct sunlight Engine at normal operating temperature All instrument panel vents open.
- Engine running and A/C control head -E87- set as follows:
- AUTO mode
- Compressor switched on (LED in ECON button not lit up)
- Temperature selection LO (for both driver's and passenger's side)
- Compressor activated (A/C clutch -N25- switched on)
- A/C Compressor Regulator Valve -N280- is switched on (on vehicles using -N280-. See MEASURING VALUE BLOCKS (VEHICLES FROM MODEL YEAR 2002) (display group 001 and 002).
- Coolant Fan -V7- running (speed depends on pressure in refrigerant circuit and engine temperature)
- Fresh Air Blower -V2- running at maximum speed
- Fresh air/recirculated air flap moved to "recirculated air" mode (within 1 minute of starting engine)
- Air should come out of the instrument panel vents
- Both temperature flaps in "cooling" position
NOTE:
Check DTC memory if one test requirement is not attained. See CHECK DTC MEMORY (FUNCTION 02)
. And carry out output Diagnostic Test Mode. See OUTPUT DIAGNOSTIC TEST MODE (DTM)
.