Coolant Thermostat

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

Special tools and workshop equipment required

Hex Ball Socket -T10058-

Removing

-- Drain the coolant. Refer to DRAINING AND FILLING .

-- Remove the cover for the air guide, disengage the side clips -arrows- to do so.

Fig 1: Identifying Air Duct Cover Slide Clips

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-- Unclip the lower air guide, disengage the clips -arrows- to do so.

Fig 2: Identifying Lower Air Guide Clips

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-- Remove both the lower air guide and the air guide hose.

Vehicles with a Noise Generator

-- Remove the charge air pipe from the noise generator. Refer to CHARGE AIR PIPE TO NOISE GENERATOR .

Continuation for all Vehicles

Fig 3: Identifying Air Guide Hose Bolts, Air Guide Pipe Hose Clamps & Electrical Harness Connector

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-- Loosen the hose clamp -2-.

-- Remove the bolt -4-.

-- Disconnect the electrical connector -arrow-.

-- Remove the bolt -1- and remove the charge air pipe downward.

-- Lay aside the coolant hose -2- and electrical wiring harness -1-.

Fig 4: Identifying Electrical Wiring Harness, Coolant Hose And Bolt

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-- Remove the bolt -arrow- and remove the bracket.

-- Remove the after-run coolant pump bracket bolt -2-.

Fig 5: Identifying After-Run Coolant Pump V51 Bracket Bolt -2-

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NOTE:

The after-run coolant pump -V51- stays in the installed position.

-- Remove the coolant hoses -1 and 2- and lay them aside.

Fig 6: Identifying Coolant Hoses

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-- Loosen the nut -2-, remove the bolt -1- and move the support for the intake manifold to the right.

Fig 7: Identifying Intake Manifold Support, Nut And Bolt

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-- Remove the oil separator. Refer to OIL SEPARATOR .

-- Remove the bolts -arrows- and remove the connecting piece. For the right bolt, the hex ball socket -T10058- is useful.

Fig 8: Identifying Coolant Thermostat Housing Bolts

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-- Remove the coolant thermostat.

Installing

Tightening specifications, refer to COOLANT PUMP AND THERMOSTAT OVERVIEW .

Install in reverse order of removal. Note the following:

NOTE:

Replace the seals and O-rings.

-- Clean the O-ring sealing surface.

-- Lubricate the O-ring with coolant additive.

-- Install the thermostat -4- into the coolant pump housing -5- and move it slightly forward -arrow-.

Fig 9: Identifying Thermostat, Housing And Components

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-- Carefully install the connecting piece -3- ; while doing so, insert the centering pin -2- into the guide -1-.