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with respect to the correctness of information in this document. Copyright by AUDI AG.
◆ The "two-way valve -N147" is only installed into vehicles with map-controlled engine cooling.
Indicated on display Desired function Fault remedy
Fresh air blower -V2 - Fresh air blower -V2 is actuated for
2 secs. at a time at 0 V, 3 V, 6 V, 9
V, 12 V, 15 V, 0 V, etc.
- Check freedom of movement of the
fresh air blower.
Use current flow diagram to check the
earth connection to fresh air blower
control unit -J126.
Check control unit -J126 (=> Electri‐
cal check, Page 46 ).
Renew operating and display unit -
E87.
Temperature sensor blower -V42
(with an operating and display unit
-E87 with one display)
- Blower -V42 (for temperature sen‐
sor installed into -E87) is switched
on and off in 5 sec. Switching inter‐
vals on or off (smoke is sucked up
by blower) 1).
- Check intake frame and intake hose
for blockage (=>Page 184 ).
Renew operating and display unit -
E87.
1) Check function of blower -V42, using for example, smoke test, (hold smoke source in front of the intake
frame installed into the operating and display unit).
Indicated on display Desired function Fault remedy
Temperature flap positioning mo‐
tor -V68
- Positioning motor -V68 moves from
stop to stop (fresh air blower is oper‐
ating, air recirculation mode).
Air temperature from the vents
changes.
- Check wiring between -V68 and -
E87 for open circuit or incorrect in‐
stallation according to current flow
diagram.
Check freedom of movement of the
temperature flap.
Check positioning motor -V68 (=>
Electrical check, Page 46 ).
Renew operating and display unit -
E87.
Indicated on display Desired function Fault remedy
Central flap positioning motor -
V70
- Positioning motor -V70 moves from
stop to stop (fresh air blower operat‐
ing, air recirculation mode, tempera‐
ture flap set to "cold").
Air distribution switches between foot‐
well and dash panel vents.
- Check wiring between -V70 and -
E87 for open circuit or incorrect in‐
stallation according to current flow
diagram.
Check freedom of movement of the
central flap.
Check positioning motor -V71 (=>
Electrical check, Page 46 ).
Renew operating and display unit -
E87.
Footwell/defroster flap positioning
motor -V85
- Positioning motor -V85 moves from
stop to stop (fresh air blower operat‐
ing, air recirculation mode, tempera‐
ture flap set to "cold").
Air distribution switches between foot‐
well and defrost.
- Check wiring between -V85 and -
E87 for open circuit or incorrect in‐
stallation according to current flow
diagram.
Check freedom of movement of
footwell/defroster flap.
Check positioning motor -V85 (=>
Electrical check, Page 46 ).
Renew operating and display unit -
E87.
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
5.1 - Final control diagnosis 21
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