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

Removing and installing thermostat

Special tools and workshop equipment required

t	Drip tray -V.A.G 1306-

t	Torque wrench -V.A.G 1331-

t	Hose clip pliers -V.A.G 1921-

t	Refractometer

Removing

Note

Always renew seals and gaskets.

–	Drain coolant → Chapter.

–	Pull coolant hose off connection -2-.

–	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- in 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-. Torque setting: 15 Nm.

–	Fill with coolant → Chapter.

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