Cleaning the Cooling Air Guides

Cleaning the cooling air guides





ATTENTION: Soiling and damage to radiator surface (vanes).
^ Engine overheating due to lack of cooling performance.
^ Clean radiator surface regularly.
^ Do not use a high-pressure steam cleaner to clean it.

1. Check cooling air guides and radiator for foreign bodies such as leaves. If necessary, carefully clean the cooling air guides and radiator surfaces at the front using a vacuum cleaner with a single nozzle, see Vacuum cleaner nozzle, long crevice tool for cleaning cooling air inlet shafts NR.160.When using high-pressure steam cleaners, the steam jets can cause additional particles of dirt to attach to the radiator surfaces and the engine can overheat due to reduced cooling performance

Checking the antifreeze content using a refractometer





Note:
^ The following diagram shows the scale used by Leitenberger
^ The scales can vary, depending on the manufacturer, observe the operating instructions
^ Use the ETHYLENE" scale for Porsche coolant.





1. The correct antifreeze content can be read off the ETHYLENE scale





2. Using a pipette, take a sample from the coolant expansion tank. Sprinkle a few drops on the test surface of the refractometer.





3. Close the light-diffusing lens. A closed film of liquid must form.

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








4. Hold the refractometer against a bright light source. A clear light/dark limit emerges. The point of intersection between this line and the display scale marks the freezing point of the coolant. A freezing point that is too low must be adjusted according to the following table