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Home >> BMW >> 2001 >> 740iL >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> COOLING SYSTEM - REPAIR INSTRUCTIONS - 740i & 740iL - E38 >> Coolant, checking coolant >> 17 00 009 Checking cooling system for water leaks >> Checking pressure drop in cooling system:

Checking pressure drop in cooling system:

Remove cap on expansion tank. Attach special tool 17 0 002 / 17 0 005.

Build up gauge pressure of 1.5 bar, wait approx. 2 minutes.

Cooling system is impervious to leaks if pressure drop is max. 0.1 bar.

Fig 1: Attach Special Tool 17 0 002 / 17 0 005
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