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Home >> BMW >> 2012 >> 335xi Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Cooling System - Repair - E92 >> Checking Cooling System >> 17 00... Instructions for repair work on cooling system

17 00... Instructions for repair work on cooling system

WARNING: Risk of scalding. Only carry out repair work on the cooling system after the engine has cooled down.
IMPORTANT: Wear protective gloves and safety goggles.
IMPORTANT: Lifetime 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.

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 cooling 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 disconnect tools such as HAZET brand tools (see chart).
HAZET number: Designation
4590-1 Disconnect-pliers, length (mm): 150
4590-2 Disconnect-pliers, length (mm): 180
4590-3 Disconnect-pliers, length (mm): 253
4590/2 Disconnect-plier set
4590/3 Disconnect-plier set
Fig 1: Identifying Hazet Brand Tools
G09847364Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 3: Loosening Spring Strap With Pliers
G09847366Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 4: Unlocking Spring Strap With Release Tool
G09847367Courtesy 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
Fig 5: Locating Hose Clamp Mounting Screw
G09847368Courtesy of BMW OF NORTH AMERICA, INC.

Instructions for dismantling/assembly of coolant hose quick-release couplings 

Dismantling of quick-release coupling 

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

Fig 6: Pulling Out Lock
G09847369Courtesy of BMW OF NORTH AMERICA, INC.

Installation note 

Check O-rings (1).

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

Fig 7: Identifying O-Rings
G09847370Courtesy 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.

Fig 8: Pressing Quick-Release Coupling Lock
G09847371Courtesy of BMW OF NORTH AMERICA, INC.
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