1999 Volkswagen Passat

Cooling system, draining and filling

Draining
CAUTION:When opening the expansion tank, hot steam may be released. Cover the cap with a rag and open very carefully.

Open cap on coolant expansion tank.
Remove sound insulation pan: à †’ 50 BODY, FRONT
Pull coolant hose retaining clip - arrow - off downward and remove coolant hose from radiator.
In addition, drain coolant from engine by disconnecting coolant hoses at oil cooler - arrows -.
NOTE:Observe disposal regulations for coolant!

Filling
NOTE:Only use coolant additive G 12 according to TL "VW 774 F". Distinguishing color: violet
G 12 violet according to TL "VW 774 F" may be mixed with previous coolant additive G 12 red!
"G 12" and coolant additives marked in accordance with TL "VW 774 F" prevent frost and corrosion damage, scaling and also raise the boiling point of the coolant. For this reason the system must be filled all year round with frost and corrosion protection additives.
Because of its high boiling point, the coolant improves engine reliability under heavy loads, particularly in countries with tropical climates.
Protection against frost must be assured to about -25 °C (in arctic climatic countries to about -35 °C).
The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The coolant additive portion must be at least 40%.
If for climatic reasons a greater frost protection is required, the amount of G 12 can be increased, but only up to 60% (frost protection to about -40 °C), as otherwise frost protection is reduced again and cooling effectiveness is also reduced.
Use only clean drinking water for mixing.
If radiator, heat exchanger, cylinder head or cylinder head gasket is replaced, do not reuse old coolant.

Recommended mixture ratios:
Frost protection toAnti-freeze portionG 12* See noteWater* See note
-25 °C-35 °C40%50%3.0 L3.5 L4.0 L3.5 L

* The quantity of coolant can vary depending upon the vehicle equipment.
Install lower coolant hose and secure.
Connect coolant hoses on oil cooler.
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:
Screw adapter V.A.G 1274/8 on expansion tank and extend it using adapter for V.A.G 1274 tester V.A.G 1274/10.

*********Loosen coolant hose on heater core and pull back hose sufficiently so that bleed hole in coolant hose - arrow - is no longer covered by connecting piece.
Fill with coolant until it escapes from coolant hose bleeder hole.
Push coolant hose on connection and secure it.*****

With and without cooling system charge unit VAS 6096:
Close expansion tank.
Turn off heater controls.
Start engine and maintain an engine speed of about 2000 rpm for approx. 3 minutes.
Allow engine to run at idle speed until lower hose on radiator becomes hot.
CAUTION:When opening the expansion tank, hot steam may be released. Cover the cap with a rag and open very carefully.

Check coolant level and top off if necessary. With engine at operating temperature, coolant level must be at max. Marking. With engine cold, coolant level must be between min. And max. Marking.