Audi Workshop Service and Repair Manuals

Removing

• ‒ → Pull dipstick -1- out of guide tube.
• ‒ Unclipcaps.
• ‒ Remove nuts -arrows- and detach engine cover.
• ‒ Remove insulation lying below.
• ‒ Re-insert dipstick into guide tube.
• ‒ Drain off coolant => Page 19-7.

• ‒ → Detach bottom coolant hose from connection -2-.
• ‒ Screw out connection bolts -1- and detach connection with thermostat -4-.
• ‒ Turn thermostat a quarter turn (90 °) anti-clockwise and take out of connection.

Installing

Install in reverse order, paying attention to the following:

Note:

Always replace gaskets and sealing rings.

• ‒ Clean/smooth sealing surface for O-ring.
• ‒ → Fit thermostat -4- with new O-ring -3- in connection -2- and turn a quarter turn (90 °) clockwise.

Note:

The bar on the thermostat must be pointing virtually straight up.

• ‒ Fit connection with thermostat into cylinder block.
• ‒ Tighten bolts -1-.
• ‒ Fill cooling system with coolant => Page 19-11.

Tightening torque

Checking thermostat

• ‒ Heat thermostat in water bath.

    1)    Not testable