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Cooling system: Check frost protection and coolant level
  Note
t  The water used for mixing is a major factor influencing the effectiveness of the coolant. Because the water quality differs from country to country and even from region to region, the quality of the water to be used in the cooling system has been specified by Volkswagen. Distilled water satisfies all requirements. It is therefore recommended to use distilled water when mixing coolant for topping up or replacing coolant.
t  Only coolant additives listed in the → Electronic Parts Catalogue (ETKA) must be used. Other coolant additives could significantly reduce the corrosion protection in particular. The resulting damage could lead to loss of coolant and, consequently, to major engine damage.
t  Mixed in the proper proportions, coolant inhibits frost and corrosion damage as well as scaling. Furthermore, the boiling point is raised. For these reasons, the cooling system must be filled all year round with a coolant additive.
t  Because of its high boiling point, the coolant improves engine reliability under heavy loads, particularly in countries with tropical climates.
    
t  ONLY refractometer -T10007A- may be used for determining current anti-freeze value.
t  Frost protection must be at least to -25 °C and, in countries with arctic conditions, down to -36 °C. Increasing the frost protection is permissible only if climatic conditions require stronger frost protection. It may, however, be increased only to a maximum of -48 °C. Otherwise, the cooling effect will be impaired.
t  The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. Frost protection must be guaranteed down to at least -25 °C.
t  Read the frost protection value from the respective scale for the coolant additive being used.
t  The temperature read off the refractometer -T10007A- corresponds the »ice flocculation point«. Flakes of ice may start forming in the coolant below this temperature.
t  Do not re-use used coolant.
t  Use only a water/coolant additive mixture as a slip agent for coolant hoses.
Checking frost protection, if necessary replenish coolant additive
Special tools and workshop equipment required
   N01-11006
t  Refractometer -T10007 A-
  Note
Read precise value for the following tests at bright/dark boundary. Using a pipette, place a drop of water on the glass to improve the readability of the bright/dark boundary. The bright/dark boundary can be clearly recognised on the “WATERLINE”.
–  Check concentration of coolant additive using refractometer -T10007 A- (refer to operating instructions).
   W00-11544
The scale -1- of the refractometer is calibrated for coolant additive G12 Plus Plus.
The scale -2- is only calibrated for coolant additive G13.
–  If frost protection is too low, you must drain some coolant and add coolant additive → Chapter.
  Note
t  If the currently used coolant additive cannot be determined precisely, use the scale -2- for coolant additive G13.
t  Observe disposal regulations!
–  Check coolant additive concentration after road test again.
Checking coolant level, replenish coolant if necessary
   N01-11032
–  Check coolant level in expansion tank when engine is cold.
t  Coolant level must be above “Min. marking”-arrow-.
   N01-11019
–  In hybrid vehicles, check additional coolant reservoir.
–  If coolant is too low, add required amount according to mixture ratio.
  Note
If fluid loss is greater than can be expected through normal use, determine source and rectify (repair measure).
Mixture ratio:
  Caution
Only distilled water may be used for mixing coolant additives. The use of distilled water ensures optimum protection against corrosion.
   N01-11020
Frost protection to Coolant additive
portion		 Distilled water
-25 °C approx. 40 % approx. 60 %
-36 °C approx. 50 % approx. 50 %

   

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