SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4-cylinder diesel engine (1.9 l engine) | 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- or drip tray -VAS 6208-

t	Spring-type clip pliers -VAS 5024 A-

t	Cooling system charge unit -VAS 6096-

t	Adapter -V.A.G 1274/8-

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

Removing

Note

Always renew seals and gaskets.

–	Drain coolant → Chapter.

–	Pull coolant hose off connection -3-.

–	Remove connecting flange -3- securing bolts -4- and remove connecting flange -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 connection -3- with thermostat -1- into cylinder block.

–	Tighten securing bolts -4-. Specified torque: 15 Nm.

–	Fill with coolant → Chapter.

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