Cooling System: Description and Operation

Note:
A new "G12 " coolant additive, recognized by its red color, has been introduced during MY 1997, replacing the "G11" used previously.
The "G11" and "G12" coolant additives are NOT interchangeable, and must NEVER be mixed. Use only water or "G12" coolant additive G 012A8D A1 to top up cooling systems filled with "G12."
Contamination of "G12" with other coolants can be identified by discoloration (brown, purple, etc.), and foamy deposits in the radiator or expansion tank. If contaminated, the system must be drained and flushed immediately.
"G12" (Part No. G 012 A8D A1) may also be used in older vehicles, but only if the cooling system is completely drained and flushed.
Part numbers listed are for reference only Always check with the Parts Department for the latest information.

Coolant additives G11 and G12 prevent freezing, corrosion damage, lime deposits, and also raise the boiling temperature. For these reasons, the cooling system must be filled the entire year with anti-freeze and corrosion protection agent.

The concentration of the coolant must not be reduced by adding water, even during the warm season or in warmer climates. The coolant anti-freeze percentage must be at least 40%.

Because of its high boiling point, the coolant contributes to safe operation at high engine load, especially in warmer climates.