Component Tests and General Diagnostics

WM 190101 Checking cooling system

Tools









Preliminary work

WARNING

Hot fluid

- Danger of scalding

-> Avoid contact with hot fluid.
-> Wear personal protective gear.

1. Allow cooling system to cool down.
2. If this has not already been done, carefully open lid of coolant expansion tank using gloves or cloths. => Lid on coolant expansion tank





Lid on coolant expansion tank

Tools and materials

Tools for cooling system





Tools





Antifreeze tester => Antifreeze and battery acid tester FT 2030 WE 1037 or Antifreeze and battery acid tester SUN-Duo-Check WE 1036

Checking cooling system

Checking engine coolant level

- Cold engine
- Vehicle horizontal

1. Unscrew lid -2- for coolant expansion tank -1- and look into the coolant expansion tank. The pointer -3- for the level indicator should be below the arrow between the plus and the minus mark. The ideal fill level is between the plus mark and the arrow.





Coolant level

Checking coolant antifreeze

Information

- The following diagram shows the scale used by Leitenberger. Antifreeze and battery acid tester FT 2030 WE 1037

- The scale can vary slightly, depending on the manufacturer.

- The ETHYLENE scale must be used for Porsche antifreeze.

- Other commercially available testers can also be used provided correct results are guaranteed.

Information

- The following table specifies how much coolant must be replaced by pure antifreeze in order to adjust the freezing point to -37 °C.





Refractometer





1. Using a pipette, take a sample from the coolant expansion tank.
2. Deposit a few drops on the test surface. => Depositing drops on the test surface





Depositing drops on the test surface

3. Close the light-diffusing lens. A closed film must form. => Closing the light-diffusing lens





Closing the light-diffusing lens

4. Using the refractometer, view against a very bright light source. A very clear light/dark border emerges. The point of intersection between this line and the display scale marks the freezing point of the coolant.
5. A freezing point that is too low must be adjusted accordingly.
6. Close the maintenance flap.





Checking cooling system for leaks

1. If a leak is suspected, proceed as described below =>
2. Check the coolant level. See above. If necessary, top up to the maximum fill level.
3. Screw adapter K65 onto the coolant expansion tank. Then apply a test pressure of approx. 1.5 bar using the cooling system test device and check the hose connections, connection pieces, cooling system components for leaks. The pressure must not drop. There must be no drops of coolant.
4. Screw cap back on the coolant expansion tank.

Checking cooling system for dirt

1. Check radiator for external dirt. The radiators should not be excessively dirty. If necessary, they can be cleaned using a vacuum cleaner with a brush attachment.
2. Check charge air coolers for external dirt. The charge air coolers should not be excessively dirty. If necessary, they can be cleaned using a vacuum cleaner with a brush attachment.
3. Check air guides to the radiators for external dirt and collected leaves. If necessary, they can be cleaned using a vacuum cleaner with a brush attachment.

Subsequent work

1. If this has not already been done, screw on lid for coolant expansion tank. => Lid on coolant expansion tank





Lid on coolant expansion tank