Volkswagen Workshop Service and Repair Manuals > Golf Mk4 > Power unit | 4-cylinder diesel engine with unit injector | Engine cooling | Removing and installing parts of cooling system

Removing and installing thermostat

Special tools and workshop equipment required

t	Refractometer -T10007-

t	Drip tray -V.A.G 1306-

t	Torque wrench -V.A.G 1331-

t	Spring-type clip pliers -VAS 5024A-

Removing

Note

Renew gaskets and seals.

–	Drain coolant → Chapter.

–	Pull coolant hose off connection.

–	Remove connecting flange -2- securing bolts -1- and remove connecting flange -2- with thermostat -4-.

–	Turn thermostat -4-¹/₄ turn (90°) to left and remove from connection -2-.

Installing

Installation is carried out in the reverse order. When installing, note the following:

–	Moisten new O ring -3- with coolant.

–	Insert thermostat -4- into union -2- and turn ¹/₄ turn (90 °) to right.

Note

The brace on the thermostat must be almost vertical.

–	Fit connection -2- with thermostat -4- into cylinder block.

–	Tighten securing bolts -1-. Specified torque: 15 Nm.

–	Fill with coolant → Chapter.

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