17 00... Notes for working on the cooling system

WARNING: Risk of scalding: only carry out repairs on the cooling system after the engine has cooled down!

IMPORTANT: Wear hand protection and safety goggles.

IMPORTANT: Service life coolant filling:
Never reuse used coolant!
When replacing and removing components which rely on the corrosion protection effect of the coolant, it is essential to change the coolant. The cooling system must therefore be drained and refilled.
In the case of other removal work involving the draining of part quantities of coolant, replace these quantities which have been drained with new coolant.

Installation note:

Use only RECOMMENDED COOLANT .

Observe appropriate water/antifreeze mixture ratio.

IMPORTANT: Open cooling system only when it has cooled down.
Opening the cooling system while hot can result in air entering the system.
This can cause overheating with permanent damage to the engine.

IMPORTANT: You must protect the alternator against dirt contamination before carrying out any repair work on the coolant circuit.
Cover alternator with suitable materials.
Failure to comply with this procedure may result in an alternator malfunction.

IMPORTANT: Do not fill coolant expansion tank over maximum level, as overfilling will cause the coolant to overflow. This may give rise to traces of coolant on the expansion tank or in the engine compartment and wrongly suggest possible leaks.

Recycling

Catch and dispose of drained coolant.

Observe country-specific waste disposal regulations.

NOTE: To disconnect coolant hoses, use commercially available disconnection tools such as HAZET brand tools (see table).

Courtesy of BMW OF NORTH AMERICA, INC.

HAZET number:	Description
4590-1	Length of disconnect pliers (mm): 150
4590-2	Length of disconnect pliers (mm): 180
4590-3	Length of disconnect pliers (mm): 253
4590/2	Set of clamping pliers
4590/3	Set of clamping pliers