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Home >> BMW >> 1997 >> 740iL >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> COOLING SYSTEM - REPAIR INSTRUCTIONS - 740i & 740iL - E38 >> Coolant, checking coolant >> 17 00 039 Bleeding cooling system and checking for water leaks >> Transparent expansion tank

Transparent expansion tank

Allow engine to cool down before checking coolant level. Coolant temperature must not exceed 30°C. If ambient temperature exceeds 30°C, allow engine to cool down at least to ambient temperature.

Check coolant level, top up coolant if necessary until fluid level is in line with marking on expansion tank.

NOTE: The tank mark indicates the fluid level at approx. 20°C.
Fig 1: Checking Coolant Level (Transparent Expansion Tank)
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