17 00... Instructions for working on cooling system.
| WARNING | Danger of scalding! Work on the cooling system should only be carried out when the engine has cooled down. |
| CAUTION | When working on the oil, coolant or fuel circuit, you must protect the alternator against contamination. Cover alternator with suitable materials. Failure to comply with this procedure may result in an alternator malfunction. |
| CAUTION | 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. |
Recycling
Catch and dispose of drained coolant.
Observe country-specific waste-disposal regulations.
Instructions for disassembly/assembly of coolant hose fast-release couplings
Disassembly of fast-release coupling
Withdraw lock (1/2), disconnect hose.
Scheme 1
Installation
Scheme 2
- Check O-rings (1).
- Do not coat O-rings (1) with antiseize agent.
Assembly of fast-release coupling
Press in lock (1) before installing fast-release coupling.
Push on hose.
Fast-release coupling must audibly snap into place.
Scheme 3
17 00 005 Draining off and topping up coolant (M54)
| WARNING | Danger of scalding! Only carry out work on the cooling system after the engine has cooled down! |
Recycling
Catch and dispose of drained coolant.
Observe country-specific waste-disposal regulations.
Necessary preliminary tasks
- E85: Remove radiator cover . See «Removing Radiator Cover»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__removing-radiator-cover) .
- Remove engine underbody protection.
Note. All illustrations feature the E85.
Note. Follow instructions for working on cooling system.
Draining coolant
Open cap (1) on coolant expansion tank.
Scheme 4
Open drain plug (1) on radiator at bottom.
Drain, catch and dispose off coolant.
Open drain plug (2) on coolant expansion tank at bottom.
Drain, catch and dispose off coolant.
Installation
Replace sealing ring.
Tightening torque, see 17 11 2AZ in COOLING SYSTEM - TIGHTENING TORQUES .
Scheme 5
Open drain plug (1) on engine block.
Drain, catch and dispose off coolant.
Installation
Replace sealing ring.
Tightening torque, see 11 11 5AZ in ENGINE - TIGHTENING TORQUES .
Scheme 6
Adding coolant
Open vent screw (1).
Scheme 7
Before filling
- Switch ignition on.
- Set heater control to maximum temperature.
- Set fan to low setting. This opens the heating valves.
Perform filling operation slowly.
Close vent screw when bubble-free coolant emerges. Fill coolant expansion tank to max. cold fill level. Marking (2) is then on a level with upper edge of coolant expansion tank.
Note. Use only recommended coolant.
Vent cooling system and check for leaks. See 17 00 039 Venting Cooling System And Checking For Leaks (M54 / M56) .
Scheme 8
17 00 009 Checking cooling system for leaks (M54)
Special tools required
- 17 0 101
- 17 0 105
- 17 0 106
| WARNING | Danger of scalding! Only perform this work after engine has cooled down. |
Note. Illustrations feature the E85.
Checking pressure drop in cooling system
Open cap on coolant expansion tank. Fit special tools 17 0 101 / 17 0 105.
Build up gauge pressure of 1.5 bar, wait approx. 2 minutes.
Cooling system is impervious to leaks if pressure drop is max. 0.1 bar.
Scheme 9
Checking pressure relief valve in cap
Screw cap (1) onto special tool 17 0 106.
Build up pressure with special tool (hand pump) 17 0 101; observe pressure gauge to ascertain when opening pressure is achieved.
Compare opening pressure of pressure relief valve. See COOLING SYSTEM - TIGHTENING TORQUES .
Scheme 10
17 00 039 Venting cooling system and checking for leaks (M54 / M56)
| WARNING | Danger of scalding! Only perform these tasks on an engine that has cooled down. |
Necessary preliminary tasks
- E85: Remove radiator cover . See «Removing Radiator Cover»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__removing-radiator-cover) .
Draining coolant
The procedure is described in the section Draining and adding coolant. See 17 00 005 Draining Off And Topping Up Coolant (M54) .
Note. Use only recommended coolant.
Adding coolant
To ensure the cooling system is properly vented, it is absolutely essential to follow the steps below
Scheme 11
Scheme 12
- Open cap (1) on coolant expansion tank.
- Open vent screw (2).
- Switch on ignition.
- Set heater control to maximum temperature.
- Set fan to lower speed (so that heater valves open).
- Fill with coolant slowly.
- Close vent screw (2) when bubble-free coolant emerges.
- Pour coolant into coolant expansion tank up to max. cold fill level. Marking (2) is then on a level with upper edge of coolant expansion tank.
- Close coolant expansion tank
- Allow engine to warm up until thermostat opens
Checking coolant level
| CAUTION | Check coolant level at a maximum coolant temperature of 30°C. |
Note. If ambient temperature exceeds 30°C, allow engine to cool down at least to ambient temperature.
Open cap carefully.
Fluid level is O.K. when top edge of coolant expansion tank is between both markings (1 and 2) on float needle.
Minimum cold fill level
- Upper edge of coolant expansion tank is level with marking (1).
Maximum cold fill level
- Upper edge of coolant expansion tank is level with marking (2).
If necessary, top up coolant.
Note. Tank mark indicates the fluid level at approx. 20°C.
Check cooling system for leaks. See 17 00 009 Checking Cooling System For Leaks (M54) .
Scheme 13
Special tools required
- 17 0 101
- 17 0 105
- 17 0 106
| WARNING | Danger of scalding! Only perform this work after engine has cooled down. |
Note. Illustrations feature the E85.
Checking pressure drop in cooling system
Open cap on coolant expansion tank. Fit special tools 17 0 101 / 17 0 105.
Build up gauge pressure of 1.5 bar, wait approx. 2 minutes.
Cooling system is impervious to leaks if pressure drop is max. 0.1 bar.
Scheme 14
Checking pressure relief valve in cap
Screw cap (1) onto special tool 17 0 106.
Build up pressure with special tool (hand pump) 17 0 101; observe pressure gauge to ascertain when opening pressure is achieved.
Compare opening pressure of pressure relief valve. See COOLING SYSTEM - TECHNICAL DATA .
Scheme 15
Removing Radiator Cover
Removing radiator cover
Note. Do not release screws (1). (They are bonded to the cover (2)).
Release screws along line.
Removing radiator cover (2).
Scheme 16
17 11 000 Removing and installing radiator (M54)
| WARNING | Danger of scalding! Only perform this work after engine has cooled down. |
Note. Follow instructions for working on cooling system.
Necessary preliminary tasks
- Remove radiator cover. See «Removing Radiator Cover»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__removing-radiator-cover) .
- Remove fan cowl. See «17 11 031 Removing And Installing/Replacing Fan Cowl»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__17-11-031-removing-and-installingreplacing) .
- Drain off and top up coolant. See BMW Operating Fluids .
- If fitted: Remove heat exchanger for automatic transmission fluid. See «17 22 010 Removing And Installing/Replacing Heat Exchanger For Automatic Transmission»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__17-22-010-removing-and-installingreplacing) .
- Remove coolant expansion tank. See «17 11 100 Removing And Installing/Replacing Coolant Expansion Tank (M54)»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__17-11-100-removing-and-installingreplacing) .
- Unlock coolant hoses and detach.
Lift radiator out of mountings.
Scheme 17
17 11 031 Removing and installing/replacing fan cowl
Necessary preliminary tasks
- Switch off ignition.
- Remove radiator cover. See «Removing Radiator Cover»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__removing-radiator-cover) .
Lift out expansion rivet (1).
Release screw (2).
Unlock and detach plug connections (3).
Remove fan cowl (4) towards top.
Note. Convert AUC sensor when replacing fan cowl.
Scheme 18
17 11 100 Removing and installing/replacing coolant expansion tank (M54)
| WARNING | Danger of scalding! Only perform this work after engine has cooled down. |
Necessary preliminary tasks
- Follow instructions for working on cooling system . See «17 00... Instructions For Working On Cooling System.»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__17-00-instructions-for-working-on)
- E85: Remove radiator cover See «Removing Radiator Cover»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__removing-radiator-cover) .
- Remove fan cowl . See «17 11 031 Removing And Installing/Replacing Fan Cowl»(/bmw/z4/e85e86-2002-2005/remont/cooling-system-mechanical/#cooling-system-repair__17-11-031-removing-and-installingreplacing) .
- Draining coolant . See BMW Operating Fluids .
Unfasten plug connection (1) and disconnect.
Withdraw lock (2).
Scheme 19
Pull locks (1 and 2) upwards and detach coolant hose from radiator/coolant expansion tank.
Scheme 20
Pull lock (1) upwards and detach coolant hose from coolant expansion tank.
Scheme 21
Illustration with radiator removed.
Pull coolant expansion tank upwards slightly out of carrier plate and pull out lower connection piece. Then tilt expansion tank to rear and remove.
Installation
Check sealing rings. Do not under any circumstances coat sealing rings with antiseize agent before installation.
Retaining lug must engage in opening on carrier plate.
Scheme 22
17 21 500 Flushing oil cooler with lines (automatic transmission)
Special tools required
- 17 2 018
- 17 2 019
Note. Carry out the work steps listed when: Fitting a new or replacement transmission Flushing can only be carried out with the automatic transmission removed.
Procedure
Automatic transmission removed.
Connect appropriate adapters to oil lines exiting from automatic transmission.
Connect the connecting line 17 2 019 from the oil collection unit with the quick-release coupling.
Connect drain line 17 2 018 using quick-release coupling.
Feed open end of drain line into a suitable collection container.
Using oil collection unit, flush approx. 1 liter of transmission fluid through oil lines and oil cooler.
Reposition quick-release couplings.
Flush oil lines/oil cooler in opposite direction with approx. 1 liter of transmission fluid.
Disconnect quick-release couplings, remove adapters.
Note. Dispose of flushing oil properly; do not under any circumstances reuse it.
Arrangement of flushing device for transmissions A5S 310Z, A5S 560Z, A5S 360R/390R, A4S 200R, A5S 325Z, GA6HP26Z
Scheme 23
Arrangement of flushing device for transmission A4S 310R
Scheme 24
Scheme 25
Scheme 26
Special tools required
- 17 2 018
- 17 2 019
Note. Carry out the work steps listed when: Fitting a new or replacement transmission Flushing can only be carried out with the automatic transmission removed.
Procedure
Automatic transmission removed.
Connect appropriate adapters to oil lines exiting from automatic transmission.
Connect the connecting line 17 2 019 from the oil collection unit with the quick-release coupling.
Connect drain line 17 2 018 using quick-release coupling.
Feed open end of drain line into a suitable collection container.
Using oil collection unit, flush approx. 1 liter of transmission fluid through oil lines and oil cooler.
Reposition quick-release couplings.
Flush oil lines/oil cooler in opposite direction with approx. 1 liter of transmission fluid.
Disconnect quick-release couplings, remove adapters.
Note. Dispose of flushing oil properly; do not under any circumstances reuse it.
Arrangement of flushing device for transmissions A5S 310Z, A5S 560Z, A5S 360R/390R, A4S 200R, A5S 325Z, GA6HP26Z
Scheme 27
Arrangement of flushing device for transmission A4S 310R
Scheme 28
Arrangement of flushing device for transmission A4S 300J
Scheme 29
Scheme 30
17 22 010 Removing and installing/replacing heat exchanger for automatic transmission
Special tools required
- 17 0 030
Necessary preliminary tasks
- After completing this operation, check fluid level in automatic transmission. See «LUBRICATION»(/bmw/z4/e85e86-2002-2005/remont/manual-trans/#on-vehicle-servicing) .
- Drain off and top up coolant. See BMW Operating Fluids
Recycling
Catch and dispose of escaping transmission fluid.
Observe country-specific waste-disposal regulations.
Illustrations show E46.
Unlock lines (1 and 2) with special tool 17 0 030 and detach.
Catch and dispose of escaping transmission fluid.
Scheme 31
Illustrations show E46.
Pull lock (1) upwards and detach heat exchanger towards rear.
Installation
Press lock (1) downwards before pushing on heat exchanger.
The lock must snap audibly into place when the heat exchanger is forced on.
Scheme 32
Check sealing rings (1), replace if necessary.
Scheme 33
See also:
• COOLING SYSTEM - TIGHTENING TORQUES
• ENGINE - TIGHTENING TORQUES
• COOLING SYSTEM - TECHNICAL DATA
• LUBRICATION
• Removing Radiator Cover
• 17 00 039 Venting Cooling System And Checking For Leaks (M54 / M56)
• 17 00 005 Draining Off And Topping Up Coolant (M54)
• 17 00 009 Checking Cooling System For Leaks (M54)
• 17 11 031 Removing And Installing/Replacing Fan Cowl
• 17 22 010 Removing And Installing/Replacing Heat Exchanger For Automatic Transmission
• 17 11 100 Removing And Installing/Replacing Coolant Expansion Tank (M54)
• 17 00... Instructions For Working On Cooling System.