Draining, filling and bleeding cooling system: VW Golf V / Jetta 1.4 (CAXA)

🧭 Before you start

Fits: VW Golf V / Jetta (1K, 2003–2009); platform code AJ5

• Opens: coolant
• Special tools named: VAS 6208, VAS 6096

Don't miss

• Depending on which component(s) are to be removed, drain coolant from engine cooling system, charge air cooling system or from both cooling systems .If coolant is to be renewed, drain coolant from both systems.
• Observe environmental regulations for disposal.
• Adhere strictly to following procedures to assure correct cooling of charge air cooling system. — Fill with coolant up to max. mark on expansion tank.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Steam may escape when expansion tank is opened. Wear eye protection and protective clothing to avoid eye injuries and scalding. Cover cap with cloth and open carefully. — Open cap on expansion tank.
2. Remove noise insulation General body repairs, exterior50Noise insulation
3. Place drip trayV.A.G. 1306 or VAS 6208 underneath. [Note: Depending on which component(s) are to be removed, drain coolant from engine cooling system, charge air cooling system or from both cooling systems .If coolant is to be renewed, drain coolant from both systems.]
4. Open spring-type clip (arrow) and pull coolant hose from lower radiator connection. [Note: Observe environmental regulations for disposal.]
5. Disconnect coolant hose (quick-release coupling) (arrow) from lower connection of radiator for charge air system. [Note: Observe environmental regulations for disposal.] [Note: The amount of water used in the coolant mixture has a great influence on its effectiveness. Because the water quality differs from country to country and even region to region, the quality of the water to be used has been defined. Distilled water fulfils all requirements. For this reason, we recommend using distilled water when mixing coolant for topping up or replacing coolant.Use only coolant additives which conform with the Electronic parts catalogue. Other coolant additives may reduce corrosion protection substantially. The resulting damage could lead to loss of coolant and subsequent severe damage to the engine.The correct coolant solution ratio helps prevent damage due to freezing and corrosion as well as scaling. Moreover, the boiling temperature is raised. Therefore, the cooling system must be filled all year round with coolant additive.Because of its higher boiling point, the coolant improves engine reliability under heavy loads, particularly in countries with tropical climates.ONLY refractometer T10007A may be used for determining current anti-freeze value.The normal frost protection must be to at least -25°C, in countries with arctic conditions to -36°C. When climatic conditions require a stronger frost protection, only then may the frost protection be increased. But only to -48°C. Otherwise, the cooling effect of the coolant will be impaired.The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The frost protection must be at least -25°C.Read off anti-freeze figures for respective replenished anti-freeze.The temperature read off the refractometer T10007A equates to the »ice flocculation point«. Flakes of ice can start forming in the coolant below this temperature.Do not reuse old coolant.Use only a water/anti-freeze mixture as a slip agent for coolant hoses.]

6. ⚠ Only distilled water may be used for mixing with coolant additives. The use of distilled water ensures optimum protection against corrosion. — Reconnect coolant hose to respective union.
7. Install noise insulation General body repairs, exterior50Noise insulation.
8. Fill coolant circuit using cooling system charge unit VAS 6096Operating instructions for cooling system charge unit VAS 6096.
9. Switch off heating and air conditioning system.
10. ⚠ Adhere strictly to following procedures to assure correct cooling of charge air cooling system. — Fill with coolant up to max. mark on expansion tank.
11. Connect and perform guided function "“Fill and bleed cooling system”".
12. ⚠ Steam may escape when expansion tank is opened. Wear eye protection and protective clothing to avoid eye injuries and scalding. Cover cap with cloth and open carefully. — Check coolant level with expansion tank closed and, if necessary, top coolant up when engine has cooled.

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