Coolant Thermostat Housing

WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.

Removing

-- Drain coolant. Refer to COOLING SYSTEM, DRAINING AND FILLING .

-- Remove bolt -1- for coolant pipe -A-.

Fig 1: Identifying Bolt -1- For Coolant Pipe -A-

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NOTE:

Ignore -2 and arrows-.

-- Remove resonance tube -2- from air guide hose.

Fig 2: Identifying Air Guide Hose, Resonance Tube And Sensor -G70- Electrical Connector

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-- Remove air guide hose -1- from throttle valve control module -J338-.

-- Disconnect the electrical connector -3- for the mass air flow sensor -G70-.

-- Detach upper section of air filter housing -arrow- and remove air filter insert.

-- Remove bolts -arrows- and remove air duct.

Fig 3: Identifying Bolts -Arrows- And Air Guide

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-- Remove lower section of air filter housing -arrows-.

Fig 4: Identifying Screws For Lower Portion Of Air Cleaner Housing

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-- Release relay lever -arrow- and remove.

Fig 5: Release Relay Lever -Arrow- And Remove

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-- Remove bolts -1- and -2-.

-- Remove intake manifold flap vacuum actuator from intake manifold and lay aside with vacuum hose connected -3-.

-- Disconnect electrical connector -arrow- on engine coolant temperature (ECT) sensor -G62-.

Fig 6: Component Location Of Engine Coolant Temperature (ECT) Sensor G62

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-- Remove coolant hoses -arrows-.

Fig 7: Identifying Coolant Hoses -Arrows-

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-- Remove bolt -1- and pull coolant pipe to left.

-- Remove the bolts -2, 3 and 4-.

CAUTION:

Risk of coolant pipe accidentally being removed too.

Press coolant pipe -1- with installation lever in direction of coolant pump -left arrow- while coolant thermostat housing -2- is removed -right arrow-.

Fig 8: Identifying Coolant Pipe And Thermostat Housing

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Installing

Tightening specifications, refer to COOLANT THERMOSTAT HOUSING ASSEMBLY OVERVIEW .

Installation is in reverse order of removal, note the following:

NOTE:

Replace seals.

-- Install intake manifold flap vacuum actuator. Refer to Removal and Installation .

-- Install air filter housing. Refer to Removal and Installation .

-- Install air filter insert. Refer to Removal and Installation .

-- Fill with coolant COOLING SYSTEM, DRAINING AND FILLING .