How to Replace the Thermostat on an Audi 1.8T

Written by zyon silket
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How to Replace the Thermostat on an Audi 1.8T
(Thinkstock Images/Comstock/Getty Images)

The Audi 1.8T engine is installed in many Audi vehicles, such as the 1996 through 2001 Audi A4. The thermostat in the engine regulates engine temperature as it exits the engine and enters the radiator. The thermostat is located in the water outlet housing, which is connected to the intake manifold on the top of the engine. You can easily locate the thermostat housing by following the hose from the radiator to where it connects to the water outlet housing.

Skill level:
Moderately Easy

Things you need

  • Socket set
  • Wire brush
  • Shop rag
  • Thermostat
  • Thermostat gasket

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  1. 1

    Remove the two bolts that secure the water outlet housing to the Audi's engine with a socket and ratchet. With the bolts removed, lift the housing off the engine to expose the thermostat.

  2. 2

    Note the positioning of the thermostat inside the engine. When you replace the thermostat, you must install it with the same positioning. Pull the old thermostat out of the engine and plug the hole with a shop rag.

  3. 3

    Remove the old gasket from the engine with a wire brush or metal scraper. Do the same for the old gasket material stuck to the bottom of the water outlet housing.

  4. 4

    Pull out the shop rag from the engine and install the new thermostat into position. Place a new gasket over the thermostat.

  5. 5

    Place the water outlet housing onto the gasket and secure both to the engine with the socket and ratchet.

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