Audi Workshop Service and Repair Manuals

Removing and installing thermostat Special tools and workshop equipment required

t  Hose clip pliers -V.A.G 1921- Removing   Note The following description corresponds to the removal and installation on vehicles with electronic throttle and secondary air system. Some operations may not be required for earlier vehicles. –  Note (if necessary obtain) code on vehicles with coded radio / radio and navigation system (RNS). –  Disconnect earth wire at battery with ignition switched off. –  Drain off coolant → Chapter.

–  Disconnect hoses -arrows- at secondary air pump.

–  Take off engine cover panel -arrows-.

–  Remove cover in front of intake manifold -arrows-.

–  Detach pipe for secondary air system from brackets on engine -arrows-.

–  Remove bolts -2- and -3- and detach bracket for dipstick guide tube -4-. –  Unplug connectors -1- for turbocharger air recirculation valve -N249- and secondary air inlet valve -N112- on underside of retainer for electrical change-over valves. –  Detach vacuum hose going to electrical change-over valves at intake manifold. –  –  Move bracket clear to the side.

–  Slacken poly V-belt → Chapter and detach belt from alternator pulley. –  Unbolt alternator -arrows- and move clear to the front. The electrical wires remain connected.

–  Detach coolant hose from hose connection -3-. –  Unscrew bolts -4- and remove hose connection with O-ring -2- and thermostat -1-. Installing Installation is carried out in the reverse order; note the following:   Note Renew seals and gaskets. –  Clean and smoothen sealing surface for O-ring as required. –  Insert thermostat. l  Cross-piece on thermostat should be vertical. –  Moisten new O-ring with coolant additive “G12+”. –  Install alternator → Rep. Gr.27. –  Install poly V-belt → Chapter. –  Fill cooling system → Anchor.   Note t  When the battery is reconnected, please ensure that the vehicle equipment (e.g. radio, radio/navigation system, clock, electric window lifters) is activated as described in the operating instructions. t  For further operations after reconnecting power supply, refer to → Rep. Gr.24. Tightening torque

Component	Nm
Hose connection to cylinder block	15