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Home >> BMW >> 2017 >> M3 Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Cooling System (Mechanical) >> Cooling System - Repair (F80) >> 17 00 Cooling System, General Information >> 17 00... Notes for working on the cooling system
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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: Frostox HT-12 antifreeze/corrosion inhibitor, BMW part number 83 19 2 468 442

Observe the 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 below).
G06853582Courtesy of BMW OF NORTH AMERICA, INC.
HAZET number: Description
4590-1 Length of disconnect pliers (mm):
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

Set of special tools 17 2 050 for removing and installing the spring holder clamps for coolant hoses.

G04796512Courtesy of BMW OF NORTH AMERICA, INC.

Loosen spring strap (1) with the pliers (2).

G04796513Courtesy of BMW OF NORTH AMERICA, INC.

Unlock spring strap (1) with the release tool (2).

G04796514Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Tightening torque for hose clamps
WAF 5 1.0 - 1.5 Nm
WAF 6 2.5 - 3.5 Nm
G04725824Courtesy of BMW OF NORTH AMERICA, INC.

Notes for disassembly/assembly of coolant hose quick-release couplings: 

Dismantling of quick-release coupling

Pull out lock (1) and (2). Detach hose.

G04725825Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Check O-rings (1).

Do not coat O-rings (1) with lubricant.

G04725826Courtesy of BMW OF NORTH AMERICA, INC.

Assembly of quick-release coupling

Press in lock (1) before installing quick-release coupling.

Push on hose.

Quick-release couplings must clearly snap audibly into place.

G04725827Courtesy of BMW OF NORTH AMERICA, INC.
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