Insufficient Cooling

Insufficient Cooling

Test requirements:
- Fuse No. S140, S6 and S16 OK
- Check DTC memory with VAG 1551 Scan Tool (ST); no DTCs recognized
- Climatronic control module coding correct: must be 00001 (model with dust and pollen filter)
- Vacuum system and hoses OK, air distribution can be adjusted properly
- Wiring OK as per wiring diagram
- A/C refrigerant system fully charged
- A/C clutch and compressor function OK
- Condenser and evaporator clean
- Outside air temperature 20° C to 30 °C (68 °F to 86 °F)


Test sequence:
- Start engine
- Set temperature control to "LO" (maximum cooling) on A/C control head
- Select minimum blower speed (manual override) on A/C control head
- Adjust air distribution to instrument panel outlets
- Insert thermometer into center instrument panel outlet
- Raise engine speed to approximately 1500 rpm
- System is OK if outlet temperature drops below 10 °C (50 °F) within one minute
- If not OK, check A/C refrigerant system


NOTE: If drops of water spray out of center vents, check evaporator water drain valve (behind bulkhead insulation) in engine compartment