Audi A3 1997 Manual page 65

Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (20 A =)
- Adapter cable V.A.G 1598/11 connected
Test step V.A.G 1598
socket
6.1
(cont.)
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Notes:
◆ Radiator fan -V7 is automatically switched on together with the magnetic clutch in vehicles with pressure
switch for air conditioner -F129.
◆ Control unit -J293, installed in vehicles with high-pressure sensor -G65, is available in 2 designs.
- In design "1" the radiator fan is automatically switched on in conjunction with the compressor (the first fan
speed
is activated regardless of the pressure in the refrigerant circuit).
- In design "2" the compressor is switched on without actuation of the radiator fan; the first
fan speed is only activated once the pressure in the refrigerant circuit exceeds 12 bar.
◆ Refrigerant temperature switch -F14 must be implemented only for vehicles with pressure switch -F129.
Note:
Test step 6.2 must be implemented only for vehicles with pressure switch -F129.
Testing of ▪ Test conditions
- Additional oper‐
ations
Actuation of air ▪ Engine running - Compressor is
conditioner mag‐
netic clutch -N25
10.3 - Test in vehicles with an operating and display unit with two displays
Heating, Air Conditioner - Edition 06.2000
Specified value
driven.
Audi A3 1997 ➤
Remedies if specified
value not attained
- Open pressure
switch -F129 (check‐
ing =>Test step 5).
Use current flow dia‐
gram to locate and
eliminate open circuit
or short to positive or
earth in the wiring be‐
tween -E87 and -
J293.
Check actuation of
control unit -J293
(=>Page 70 ).
Refrigerant tempera‐
ture switch -F14 de‐
fective (open) or re‐
frigerant too hot -
check.
Control unit -J293 de‐
fective - replace.
59