Volkswagen Workshop Service and Repair Manuals > Golf Mk4 > Power unit | 4-cylinder injection engine (1.6 l engine, roller rocker fingers), Mechanics | Engine cooling | Removing and installing parts of cooling system | Draining and filling coolant

Filling

Note

t	Only use coolant additive G 12 in accordance with TL VW 774 F. Identification: purple colour.

t	G 12 and coolant additives marked in accordance with TL VW 774 F prevent frost and corrosion damage, scaling and also raise boiling point of coolant. Therefore, the cooling system must be filled all year round with frost and corrosion protection additives.

t	G 12 purple (in accordance with TL W 774 F) can be mixed with existing coolant additives G 11 and G 12 red!

t	Because of its high boiling point, the coolant improves engine reliability under heavy loads, particularly in countries with tropical climates.

t	Frost protection is required down to about -25 °C (in countries with arctic climates: down to about -35 °C).

t	The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The coolant additive must be at least 40% of mixture.

t	If for climatic reasons greater frost protection is required, the amount of G 12 can be increased, but only up to 60% (frost protection to about -40 °C). Otherwise frost protection and cooling effectiveness are reduced again.

t	The refractometer -T10007- is recommended for determining the current anti-freeze density.

t	If radiator, heat exchanger, cylinder head or cylinder head gasket is replaced, do not reuse old coolant.

Recommended mixture proportions:

¹⁾	The quantity of coolant can vary depending upon vehicle equipment.

–	Fit and tighten coolant drain plug and secure coolant hose to oil cooler connection.

With cooling system charge unit -VAS 6096-

–	Screw adapter -V.A.G 1274/8- onto expansion tank.

–	Fill coolant circuit using cooling system charge unit -VAS 6096- → operating instructions for cooling system charge unit.VAS 6096

Without cooling system charge unit -VAS 6096-

–	Fill with coolant up to max. mark on expansion tank.

With or without cooling system charge unit -VAS 6096-

–	Fit expansion tank cap.

–	Start engine and maintain an engine speed of about 2000 rpm for about 3 minutes.

–	Run engine until radiator fan cuts-in.

WARNING

Hot steam may escape when expansion tank is opened. Place rag over cap and open with caution.

–	Check coolant level and top-up if necessary. When the engine is at normal operating temperature, the coolant level must be on the max. mark; when the engine is cold, between the min. and max. marks.

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