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4 Diagnosis and Testing
⇒ “4.1 A/C Compressor Regulator Valve N280 , Checking Switch-
On Signal“, page 76
⇒ “4.2 A/C Unit, Checking Cooling Output“, page 79
⇒ “4.3 Causes of Odor“, page 89
⇒ “4.4 Components Actuated by A/C System, Electrical Test“,
page 91
⇒ “4.5 Condensation Water Drain Hose, Checking“, page 92
⇒ “4.6 Heating Performance Of A/C System, Checking“,
page 93
⇒ “4.7 Heated Seats, Checking“, page 96
⇒ “4.8 High Pressure Sensor G65 , Checking Pressure Signal“,
page 96
⇒ “4.9 Passenger Compartment Forced Air Extraction, Check‐
ing“, page 98
⇒ “4.10 Plenum Chamber Water Drain, Checking and Cleaning“,
page 100
⇒ “4.11 Rear Window Defogger, Checking “, page 101
⇒ “4.12 Wiring and Component Testing with Test Box VAG 1598A
“, page 101
4.1 A/C Compressor Regulator Valve -
N280- , Checking Switch-On Signal
Note
♦
The test for an A/C compressor manufactured by “Denso“ of
type “6 SEU 14“ is described in the following. Test is to be
performed in the same way for vehicles with a different com‐
pressor type or a different manufacturer.
♦
Next, testing is described for vehicles equipped with a 2.0L
TFSI and a 3.2L MPI engine. This procedure might be different
for vehicles that have a different 4 or 6 cylinder engine, or a 5
cylinder engine.
Preparation
– Switch off ignition.
– Remove the engine cover (for example, on 4 cylinder vehicles,
where the connector is accessible from the top; not necessary
on a 2.0L TFSI vehicle). Refer to ⇒ Engine Mechanical; Rep.
Gr. 13 ; Removal and Installation .
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
76 Rep. Gr.87 - Air Conditioning
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