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Home >> BMW >> 2000 >> 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 >> Notes

17 00 039 Bleeding cooling system and checking for water leaks: Notes

WARNING: Danger of scalding! Only perform this work after engine has cooled down.

Fill cooling system, refer to 17 00 005 DRAINING AND TOPPING UP COOLANT 

Check cooling system for leaks, refer to 17 00 009 CHECKING COOLING SYSTEM FOR WATER LEAKS 

Open sealing cap. Set heater control to maximum temperature. Set blower to low level. This opens the heating valves and sets the auxiliary water pump in operation. Run engine and briefly press accelerator pedal three to four times (approx. 4500 to 5000 RPM) to flush engine cooling circuit. In doing so, do not run engine for longer than approx. 30 seconds; otherwise coolant will heat up and expand. If the coolant level drops in the expansion tank during this operation, top up expansion tank with coolant up to edge. Screw on sealing cap and warm up engine until thermostat opens.