Volkswagen Parts Catalog Volkswagen Accessories Catalog Volkswagen Tech Information Volkswagen Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
Bookmark and Share

Pelican Technical Article:

Coolant Flush and Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$50

Talent:

**

Tools:

19mm, 10mm, 8mm socket, flathead screwdriver, large bucket

Applicable Models:

VW Golf GTI (2000)
VW Golf GTI 1.8T (2002-05)
VW Golf GTI 20th Anniversary (2003)
VW Golf GTI 337 (2002)
VW Golf GTI GLS (2001)

Parts Required:

New coolant, hose gasket

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. 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. A great many of these car have had the engine trays and front side shields removed over the years and not replaced. If you happen to have a car that still has all the under trays and original hardware here is what you need to do. There are four T25 Torx bolts holding the tray on, remove them and slide the tray back out of the friction clips on the front air dam.

There is access hole in the left side shield that you can access the drain plug from, or if you want to remove the shield it is held in place by friction at the front and a speed clip on the frame rail.

With the tray removed you will see the radiator drain plug on the lower left front of the car. Place a catch bucket or tray under the plug and open the drain plug. The fluid drains out a small spigot facing downward. Drain the radiator completely.

Open the fluid reservoir to assist in draining.

Close the radiator drain plug. Fill the car with water (some people will insist that you use distilled water but you are just going to drain it again so I use tap water) close the lid on the coolant reservoir and start the car, get in the car and turn the heat up to full hot and run the blower motor at full. Let this run for a few minutes. Shut off the car and wait for the engine and coolant to cool.

Drain the car again.

This is usually good enough if you perform regular scheduled maintenance on the car but if you want to be really thorough at getting as much of the old fluids and contaminants out of the car proceed with the following.

Disconnect the hose from the lower right side of the radiator. This is a quick disconnect fitting. Lift up the retaining pin and wiggle the connection off the radiator outlet. Make sure to install a new gasket before reinstalling.

On the top left side of the engine is a small cover over the radiator hose. It is held in place by 2 Philips head screws. Remove these. Remove the radiator hose clamp and hose.

There are two hoses that connect to the oil filter housing that you want to remove and let drain. Depending on whether the clamps have been put on from the bottom or top of the housing will determine where you can get access to them. I removed mine from the top of the engine.

Use a garden hose and place it in the upper radiator outlet. Turn on the hose and flush the radiator until the water runs clear out the bottom.

Reattach all the hoses and fill with coolant. Do not forget if you are using concentrated coolant to mix it with the appropriate amount of distilled water. After filling the car start the engine and allow it to run for a few minutes to clear any trapped air pockets and top up the reservoir to the full line.

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. A great many of these car have had the engine trays and front side shields removed over the years and not replaced. If you happen to have a car that still has all the under trays and original hardware here is what you need to do. There are four T25 Torx bolts (yellow arrows) holding the tray on, remove them and slide the tray back out of the friction clips (red arrows) on the front air dam.

Figure 2

This photo illustrates where the plate connects to the two side shields (red arrows)

There is access hole in the left side shield (red arrow) that you can access the drain plug from, or if you want to remove the shield it is held in place by friction at the front and a speed clip on the frame rail (yellow arrow).
Figure 3

There is access hole in the left side shield (red arrow) that you can access the drain plug from, or if you want to remove the shield it is held in place by friction at the front and a speed clip on the frame rail (yellow arrow).

With the tray removed you will see the radiator drain plug (red arrow) and spigot (yellow arrow) on the lower left front of the car.
Figure 4

With the tray removed you will see the radiator drain plug (red arrow) and spigot (yellow arrow) on the lower left front of the car. Place a catch bucket or tray under the plug and open the drain plug.

The fluid drains out a small spigot facing downward.
Figure 5

The fluid drains out a small spigot facing downward. Drain the radiator completely.

Open the fluid reservoir (red arrow) to assist in draining.
Figure 6

Open the fluid reservoir (red arrow) to assist in draining. Close the radiator drain plug. Fill the car with water (some people will insist that you use distilled water but you are just going to drain it again so I use tap water) close the lid on the coolant reservoir and start the car, get in the car and turn the heat up to full hot and run the blower motor at full. Let this run for a few minutes. Shut off the car and wait for the engine and coolant to cool. Drain the car again.

Disconnect the hose from the lower right side of the radiator.
Figure 7

Disconnect the hose from the lower right side of the radiator. This is a quick disconnect fitting. Lift up the retaining pin (yellow arrow) and wiggle the connection off the radiator outlet (red arrow).

On the top left side of the engine is a small cover over the radiator hose.
Figure 8

On the top left side of the engine is a small cover over the radiator hose. It is held in place by 2 Philips head screws (red arrows). Remove these.

Remove the radiator hose clamp and hose (red arrow).
Figure 9

Remove the radiator hose clamp and hose (red arrow).

There are two hoses that connect to the oil filter housing that you want to remove and let drain (red arrows).
Figure 10

There are two hoses that connect to the oil filter housing that you want to remove and let drain (red arrows). Depending on whether the clamps have been put on from the bottom or top of the housing will determine where you can get access to them. I removed mine from the top of the engine.

Use a garden hose and place it in the upper radiator outlet (red arrow).
Figure 11

Use a garden hose and place it in the upper radiator outlet (red arrow). Turn on the hose and flush the radiator until the water runs clear out the bottom. Reattach all the hoses and fill with coolant. Do not forget if you are using concentrated coolant to mix it with the appropriate amount of distilled water. After filling the car start the engine and allow it to run for a few minutes to clear any trapped air pockets and top up the reservoir to the full line.

Bookmark and Share
Comments and Suggestions:
Mick Comments: hey I just changed my fluid and it didn't take all the coolant it needs I have the 1.8 05 mk4 so it needs 5 liters but I could only get in a lil more than half without it exceeding the max line. This is the us model too I heard can models have an auxiliary heater so they need more. I'm just a lil confused about this.
November 12, 2016
  Followup from the Pelican Staff: Did it take less than you drained? if so there is likely air trapped. - Nick at Pelican Parts  
pedro Comments: is it dangerous to fill my coolant with tap water?
I have put tap water in coolant bottle shold I drain it?
May 23, 2014
  Followup from the Pelican Staff: You should add a 50/50 coolant and distilled water mix. - Nick at Pelican Parts  

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Fri 12/9/2016 02:34:53 AM