Audi Workshop Service and Repair Manuals

Special tools, testers and other items required

• ◆ Vehicle diagnostic, testing and information system VAS 5051 (or fault reader V.A.G 1551/vehicle system tester V.A.G 1552 with wire V.A.G 1551/3) and adapter VAS 6017 (if several vehicle systems are to be tested)
• ◆ Minitester V.A.G 1362 (for temperature measurement)

Test requirements:

• ● Engine warm
• ● All air ducts, covers and seals OK and properly fitted
• ● Air throughput through dust and pollen filter not impaired by contamination
• ● Vehicle not exposed to sunlight
• ● Fault memory interrogated

• ● Encoding checked and corrected if necessary => Page 01-114
• ● Basic setting performed => Page 01-99
• ● All dash panel vents open
• ● Bonnet closed

Note:

If one of these test requirements is not met, interrogate fault memory => Page 01-85.

Checking maximum specified temperature setting

• ‒ Close doors, windows and sun roof.
• ‒ Open all dash panel vents.
• ‒ Start engine.
• ‒ Start heating system self-diagnosis => Page 01-9.

• ‒ → Set temperature preselection "1/3" (approx. 4 bars -A- for driver's and front passenger's side) on -E87 (heating).
• ‒ Set air exit direction on -E87 (heating) to "Dash panel and footwell vents".
• ‒ In "Reading measured value block" function => Page 01-140.
• ‒ Set engine speed to 2000 rpm.
• ‒ Set fresh-air blower speed by way of operating and display unit for air conditioner/Climatronic -E87 (heating) to 2/3 of maximum speed.

• ‒ → Compare measured value (for sender -G89) displayed in zone "2" of display group "010" with measured values in display group "009" zones "1" to "4" (senders -G150, -G151, -G261 and -G262) to values for temperature range shown on graph.

Note:

Tolerance band approx. ± 5 °C

•     A -    Vent temperature

•     → B -    Specified vent temperature at 2/3 of maximum temperature setting
•     C -    Specified vent temperature at 1/3 of maximum temperature setting
•     D -    Ambient temperature

Example: At 1/3 of max. specified vent temperature (measured values of senders -G150, -G151, -G261, -G262)

• ‒ → Set temperature preselection "2/3" (approx. 4 bars -A- for driver's and front passenger's side) on -E87 (heating).
• ‒ Set air exit direction on -E87 (heating) to "Dash panel and footwell vents".
• ‒ In "Reading measured value block" function => Page 01-140.
• ‒ Set engine speed to 2000 rpm.
• ‒ Set fresh-air blower speed by way of operating and display unit for air conditioner/Climatronic -E87 (heating) to 2/3 of maximum speed.

• ‒ → Compare measured value (for sender -G89) displayed in zone "2" of display group "010" with measured values in display group "009" zones "1" to "4" (senders -G150, -G151, -G261 and -G262) to values for temperature range shown on graph.

Note:

Tolerance band approx. ± 5 °C

•     A -    Vent temperature

•     → B -    Specified vent temperature at 2/3 of maximum temperature setting
•     C -    Specified vent temperature at 1/3 of maximum temperature setting
•     D -    Ambient temperature

Example: At 2/3 of max. specified vent temperature (measured values of senders -G150, -G151, -G261, -G262)

Notes:

• ◆ If required values are not attained, compare measured values indicated in display group "009" zones "1, 2, 3" and "4":
• ‒ If measured values in display zones "1" and "3" or "2" and "4" are OK, check temperature flap control motor for side on which measured value is not OK (-V158 or -V159). To do so, perform electrical check on temperature flap control motors (-V158 or -V159)
  => Page 01-247 "Electrical Check, Test Step 4".
• ‒ Check senders -G150, -G151, -G261 and -G262 for proper installation and electrical connections for contact resistance => Page 01-247 "Electrical Check, Test Step 4". Replace any defective components.
• ‒ Check operation of levers between control motors and flaps
  => Page 80-57.
• ◆ Temperature of air flow from "Centre" dash panel vents can also be measured using Minitester V.A.G 1362, for example.
• ◆ Respective temperatures for left/right side can be synchronised by simultaneously pressing buttons "+" and "-" for temperature preselection on operating and display unit for air conditioner/Climatronic -E87 (heating).