Audi TT - A;C System Control and Regulation Components Outside Passenger Compartment

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♦ Replace the belt pulley (“Denso“ A/C compressor, version “2“)
⇒ “2.5 Belt Pulley, Denso A/C Compressor, Version 2“,
page 53 .
♦ Belt pulley, replacing (“Sanden“ A/C compressor), refer to
⇒ “5.6.3 Sanden A/C Compressor“, page 121 .
Preparation
– Remove noise insulation. Refer to⇒ Body Exterior; Rep. Gr.
66 ; Removal and Installation
– Releases the tension on the ribbed belt (belts) and remove it
(them). Refer to⇒ Engine Mechanical; Rep. Gr. 13 ; Removal
and Installation .
Note
♦ The A/C compressor can be removed and installed at the
bracket without opening the refrigerant lines. Refer to
⇒ “5.1 A/C Compressor, Removing From Bracket“,
page 103 .
♦ Mark direction of rotation of ribbed belt using chalk or felt-tip
marker before removing. Running a used belt in the opposite
direction could destroy it.
♦ The A/C compressor on 5 cylinder vehicles have 2 ribbed
belts. The A/C compressor has a belt pulley with a double belt
guide.
– Remove the A/C compressor from engine (if equipped). Refer
to
⇒ “5.1 A/C Compressor, Removing From Bracket“,
page 103 or
⇒ “5.2 A/C Compressor, Removing From Bracket“,
page 106 .
1.2 A/C System Control and Regulation
Components Outside Passenger Com‐
partment
Note
♦ If there is a malfunction in the system, first check the Clima‐
tronic control module -J255- DTC memory. Refer to Vehicle
diagnosis, testing and information system -VAS5051B- in the
"Guided Fault Finding" function.
♦ If no fault is displayed, read the measured value block for the
Climatronic control module and activate the component with
the “output diagnosis test mode“ function on the Vehicle diag‐
nosis, testing and information system -VAS5051B- in the "Gui‐
ded Fault Finding" function.
♦ The electrical test for various actuators, potentiometers and
sensors is described in Guided Fault Finding using Vehicle
diagnosis, testing and information system -VAS5051B- in the
"Guided Fault Finding" function.
♦ Servicing operations on refrigerant circuit are described in
⇒ “1.19 Refrigerant Circuit, Servicing“, page 38 .
♦ Perform the following work after completion of repair opera‐
tions:
– Check Climatronic control module DTC memory and erase
any possible displayed malfunctions using Vehicle diagnosis,
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
1. General Information 25