Cooling system components, removing and installing: Thermostat: Removing
WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Observe procedures for disconnecting battery. Refer to Battery
.
- With ignition switched off, disconnect battery Ground (GND) cable -arrow-.
- Remove engine cover -arrows-.WARNING: Risk of scalding due to hot steam and hot coolant.
- When the engine is warm the cooling system is under pressure.
- To reduce pressure, cover coolant reservoir cap with cloth and carefully open.
- Open cap of coolant expansion tank.
- Loosen quick-release fasteners -1 and 2- and remove front noise insulation.
- Drain the coolant. Refer to Cooling system, draining and filling .
- Remove oil pressure sensor electrical connector -1-.
- Also remove lower coolant hose on coolant pipe -2- and allow remaining coolant to drain.
- Mark direction of rotation of ribbed belt.
- Pivot the belt tensioner for ribbed belt in direction of -arrow- to relieve tension on ribbed belt.
- Secure tensioning element using -T40098- .
- Remove ribbed belt.
- Remove the generator. Refer to Generator (GEN) .
- Remove the coolant pipes. Refer to Coolant pipe, removing and installing .
- Remove the coolant pipe -arrow- from the intake manifold and move it to the side.
- Remove the coolant hose -1- by lifting the retaining clip.
- Remove the bolts -2 and 3- and remove the thermostat.
NOTE:
Before removing the ribbed belt, mark the turning direction on it with chalk or a felt tip pen. A reversed turning direction can cause damage to the belt under operating conditions.