Audi Workshop Service and Repair Manuals

Removing, installing and checking thermostat Removing –  Drain off coolant → Chapter.

–  Remove air intake hose at intake manifold flap motor -V157- by lifting retaining clip -arrow- slightly.

–  Disconnect bottom coolant hose from hose connection -2-. –  Remove securing bolts -1- for hose connection and remove hose connection with thermostat -4- and O-ring -3-.

–  Turn thermostat -item 2- approx. 90° (1/4 turn) anti-clockwise -arrow- and remove it from hose connection. –  Remove O-ring -1-. Installing Installation is carried out in the reverse order; note the following:   Note Renew O-ring. –  Clean and smoothen sealing surface for O-ring as required.

–  Insert thermostat -3- with new O-ring -2- into hose connection -1-. l  When inserting, the cross-piece on the thermostat should be horizontal as shown in the illustration. –  Then turn thermostat 90° (1/4 of a turn) clockwise. –  Lubricate O-ring with coolant additive.

–  When installing air intake hoses with plug-in connectors, ensure that the securing clip -arrow- engages audibly on the retaining lug -A-. –  Fill cooling system → Anchor. Tightening torque

Component	Nm
Connection to cylinder block	13

Checking thermostat –  Heat up the thermostat in hot water.

Starts to open	Fully open	Opening travel
approx. 87 °C	approx. 102 °C 1)	at least 8 mm
l  1) Cannot be tested.