Cooling System, Flushing With Distilled Water

WARNING: This page is about a different car, the 2015 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Remove the bleeder hose -2- from the coolant expansion tank -1-.

-- Connect the bleeder hose -2- from the coolant expansion tank with the flushing hose -1-.

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Seal the connection on the coolant expansion tank using the plugs -3-. Secure the plug with a hose clamp.

-- Close the shut-off valve -B-.

-- Remove the engine cover.

Vehicles With Camshaft Adjustment:

-- Remove the air filter housing. Refer to AIR FILTER HOUSING, REMOVING AND INSTALLING .

Continuation For All Vehicles:

The cooling system is divided into the following coolant circuits:

Cylinder block and cylinder head
Heater Core for the Heater
Radiator
Charge air cooler and charge air cooling circuit cooler

NOTE:

The goal in the following procedure is to flush the four coolant circuits by clamping the bleeder hoses while alternating from side to side.

This procedure must be done twice with distilled water. Then it is flushed twice with coolant.

The liter specifications are averages and may differ depending on the vehicle equipment. The quantity can be read using the scale on the container.

Important for the flushing quantity is the change in color at connection 1 in the sight window. Likeness in color between connection 1 and 2 in the sight window is only achieved during the second flushing procedure.

If a change in color is visible in the viewing glass, the next coolant circuit is flushed.

1. Cylinder Block And Cylinder Head, Flushing With Distilled Water

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

A check valve -1- is installed in the bleeder hose from the charge air cooler. Therefore the hose must be clamped at the locations indicated.

-- Use hose clamps to clamp off the bleeder hoses at the locations indicated.

-- Open the shut-off valve -A- on the valve block. Distilled water is now pumped through the engine.

-- Monitor the sight window: if the coolant begins to discolor, close the shut-off valve -A-.

Required amount of distilled water: approximately 2 to 3 liters (2.11 to 3.17 quarts)

2. Flushing The Heater Core For The Heater With Distilled Water:

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Use hose clamps to clamp off the bleeder hoses at the locations indicated.

-- Open the shut-off valve -A- on the valve block. Distilled water is now pumped through the engine.

-- Monitor the sight window: if the coolant begins to discolor, close the shut-off valve -A-.

Required amount of distilled water: approximately 2 liters (2.11 quarts)

3. Radiator, Flushing With Distilled Water

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Use hose clamps to clamp off the bleeder hoses at the locations indicated.

-- Open the shut-off valve -A- on the valve block. Distilled water is now pumped through the engine.

-- Monitor the sight window: if the coolant begins to discolor, close the shut-off valve -A-.

Required amount of distilled water: approximately 2 liters (2.11 quarts)

4. Charge Air Cooler And Charge Air Cooling Circuit Cooler, Flushing With Distilled Water

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Use hose clamps to clamp off the bleeder hoses at the locations indicated.

-- Open the shut-off valve -A- on the valve block. Distilled water is now pumped through the engine.

-- Monitor the sight window: if the coolant begins to discolor, close the shut-off valve -A-.

Required amount of distilled water: approximately 2 liters (2.11 quarts)

Repeat the flushing procedures 1 through 4, but only pump through approximately one liter (1.05 quart) of distilled water each time. Refer to COOLING SYSTEM, FLUSHING .

Then flush the cooling system with coolant: