Volkswagen Workshop Service and Repair Manuals > Golf Mk5 > Power unit | 4-cylinder diesel engine (2.0 l engine, 4 valve) | Engine cooling | Parts of cooling system

Removing and installing thermostat

Special tools and workshop equipment required

t	Jointed wrench 10 mm -3185-

t	Hexagon key extension, 5 mm -3249-

t	Refractometer -T10007-

t	Torque wrench (5…50 Nm) -V.A.G 1331-

t	Spring-type clip pliers -VAS 5024/A-

t	Drip tray for V.A.G 1202 -V.A.G 1306/- or drip tray for workshop crane -VAS 6208-

Removing

Note

Always renew seals and gaskets.

–	Drain coolant → Chapter.

–	Remove alternator → Rep. gr.27

–	Pull connector off radiator outlet coolant temperature sender -G83-.

–	Pull coolant hose off connection.

–	Loosen securing bolts -4- of union -3- using T-bar and socket, 10 mm -3185- and remove using hexagon key extension, 5 mm -3249- and remove union -3- with thermostat -1-.

–	Turn thermostat -1-¹/₄ turn (90 °) to left and remove from connection -3-.

Installing

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

–	Moisten new O-ring -2- with coolant.

–	Insert thermostat -1- in union -3- and turn ¹/₄ turn (90 °) to right.

Note

The brace on the thermostat must be almost vertical.

–	Fit union -3- with thermostat -1- into cylinder block.

–	Tighten securing bolts -4- using T-bar and socket, 10 mm -3185-. Specified torque: 15 Nm.

–	Replenish coolant → Chapter.

Volkswagen Workshop Service and Repair Manuals