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Home >> BMW >> 2021 >> M3 Base, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Cooling System -- Repair M3 (G80) >> 17 00 Coolant >> Notes for working on the cooling system (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)

Notes for working on the cooling system (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS)

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 (see Fluid Capacities tab for the selected vehicle).

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)
G06853582Courtesy 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

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

  1. Release tool
  2. Pliers (bent version)
  3. Pliers (straight version)
G09995942Courtesy 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)

G13822179Courtesy 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
G10140236Courtesy 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

G13822182Courtesy 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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