Volkswagen Passat 1995 Official Factory Repair Manual page 4266

Work descriptions
12 according to TL "VW 774 D" .
Some vehicles are filled with coolant additive G 11 (color
green). When adding coolant, use only coolant G 11
according to TL "VW 774 D" . If these vehicles were filled
with G 12 for repairs, only G 12 may be refilled.
Caution!
Coolant additives G 11 and G 12 must never be
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mixed.
If fluid in expansion tank is brown, G12 or G 11
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has been mixed with another coolant additive. In
this case, coolant must be replaced immediately
(repair measure)! If coolant is not changed,
serious malfunctions or damage to engine can
occur!
Cooling system anti-freeze protection and
coolant level, checking
Required special tools and equipment
Refractometer T10007
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Note:
Read bright/dark boundary to obtain an accurate
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reading for following tests. Place a drop of water on
glass to improve readability of bright/dark boundary.
bright/dark boundary can be clearly recognized on
"WATERLINE" .
- Check concentration of coolant additive using
refractometer T10007 (follow user manual).
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12/7/2004