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In the engine compartment

226

Coolant

Do not open up the cooling system while

the engine is hot, otherwise you may

scald yourself on the escaping coolant steam.<

Coolant consists of water and an antifreeze and

corrosion inhibitor additive. Not all commer-

cially available additives are suitable for your

BMW. BMW Service can provide details of

which additives are suitable.

Use only suitable additives, otherwise the

engine could incur damage. As these

additives are hazardous to health, observe the

notes on the containers.<

When disposing of coolant additives,

comply with the relevant environmental

protection regulations.<

Checking coolant level

1. Let the engine cool.

2. Turn the cap on the expansion tank slightly

anticlockwise until it starts to open, then

allow the pressure to escape before open-

ing it fully.

3. The coolant level is correct if it is between

the maximum and minimum marks in the

filler neck, see also diagram next to the filler

neck.

4. If necessary, slowly top up to the correct

level; do not overfill.

5. Turn the cap to close it, ensuring it is tight.

6. Have the cause of coolant loss rectified as

soon as possible.

BMW 730d User Manual

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