Volkswagen Golf 1999 Service Manual page 3924

A/C refrigerant system, troubleshooting
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Test 1: Air temperature drop from center
instrument panel outlet, checking (A/C
system cooling performance)
- Start engine.
- Set temperature control to maximum "cold" (if
manual A/C) or "LO" (if Climatronic).
- Manual A/C: Press "A/C" button and select
second blower speed.
- Climatronic: Select minimum blower speed
(manual override)) by pressing "decrease blower
speed" button (observe blower speed display in
control head).
- Adjust air distribution to instrument panel
outlets.
- Insert thermometer into center instrument panel
outlet and raise engine speed to approximately
1500 RPM.
Specified result
With humidity normal and outside (ambient)
temperature between 20-25 C (68-77 F),
system is cooling satisfactorily if air temperature
from center instrument panel vent drops below
10 C (50 F) within 1 minute.
For higher ambient temperatures and/or higher
humidity, specified air temperature from center
instrument panel vent can be slightly higher.
If specified reading is not obtained, perform tests
2 and 3, then compare results of all three tests
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87-134
13/2/2005