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Pelican Technical Article:

Coolant Flush and Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$15 to $50

Talent:

**

Tools:

Pliers, flathead screwdriver, large bucket

Applicable Models:

VW GTI (2006-09)

Parts Required:

New coolant,

Hot Tip:

Get a really big bucket

Performance Gain:

Fresh coolant

Complementary Modification:

New hoses

If you are changing your coolant this is also the perfect time to give you cooling system a complete flush. While it is next to impossible to get all of the coolant and contaminants out of the system without removing the heater core lines and blowing out the heating system this method will get the system as clean as possible and more than good enough for the next three years.

A couple of safety precautions/instructions you may want to observe before beginning:

Allow cooling system to cool down to a coolant temperature of less than 90°C. Open the cap of cooling system slowly; turn a conventional coolant cap as far as the first detent and turn a screwed coolant cap approx. 1/2 turn and release the pressure. Wear protective gloves, protective clothing and eye protection. NEVER pour coolant into beverage bottles, cups, etc... Someone might accidentally pick that cup up and start to drink.

Begin by safely jacking up and supporting your car. With the car safely off the ground you will need to remove the engine tray and right side lower wheel well panel. A great many of these car have had the engine trays and front side panels removed over the years and not replaced. If you happen to have a car that still has all the under trays and original hardware please see our article on under tray removal.

Begin by safely jacking up and supporting your car.
Figure 1

Begin by safely jacking up and supporting your car. With the car safely off the ground you will need to remove the engine tray (red arrow) and right side lower wheel well panel (yellow arrow). A great many of these car have had the engine trays and front side panels removed over the years and not replaced. If you happen to have a car that still has all the under trays and original hardware please see our article on under tray removal

There is no drain plug on the radiator in the GTI MkV.
Figure 2

There is no drain plug on the radiator in the GTI MkV. You will need to remove the lower radiator on the right hand side. Place a large bucket or catch tray under the right side of the radiator. This hose is a quick release connection and you should be able to insert a screwdriver and unclip the connection (red arrow) and separate the hose from the radiator.

Our quick release connections were stuck, so we had to remove the standard hose clamp (red arrow) and remove the hose that way.
Figure 3

Our quick release connections were stuck, so we had to remove the standard hose clamp (red arrow) and remove the hose that way.

With the hose disconnected the coolant will drain out of both the radiator (red arrow) and the hose.
Figure 4

With the hose disconnected the coolant will drain out of both the radiator (red arrow) and the hose. The Turbo hose is directly in the way of the draining coolant (yellow arrow) so I used the two quick disconnects and removed the hose. You might want to do this as it really helps avoid a mess.

Open the cap on the reservoir (red arrow) to break the vacuum seal and help the system drain.
Figure 5

Open the cap on the reservoir (red arrow) to break the vacuum seal and help the system drain.

If you want to just refill the system now you can add the proper combination of coolant and distilled water (50/50) to the reservoir slowly.
Figure 6

If you want to just refill the system now you can add the proper combination of coolant and distilled water (50/50) to the reservoir slowly. Start the motor and allow the coolant to circulate. Stop the motor and add more coolant mixture to the reservoir as needed. Repeat until the coolant reaches the correct level in the reservoir. If you would like to flush out the system disconnect one of the quick release connections on the upper left hose (red arrows). Use a garden hose and place it in the upper radiator outlet (red arrows). Turn on the hose and flush the radiator until the water runs clear out the bottom. You can also run the hose and water through the coolant reservoir until clear water runs out of the lower hose. Reconnect all the hoses and follow the procedure state earlier.

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Page last updated: Sat 12/3/2016 02:37:09 AM