BMW AG Motorcycle (K1100LT, K1100RS). Manual - part 18

17.5

Changing coolant

Draining coolant

•

Remove fuel tank.

•

Release cap (1) on filler neck. 

•

 [RS] 

Remove lower section of fairing 

•

Release screw plug (2) on water pump

 [RS] 

, or 

water temperature sensor

 [LT].

•

Note gasket.

X 

Tightening torque:

Drain plug, temperature sensor

...................... 9 Nm

Filling with coolant

•

Fill with coolant up to lower edge of filler neck (1).

Coolant:

Concentration (down to – 28 °C)
Antifreeze 

......................................................40 %

Water

..............................................................60 %

Capacity

.....................................3.0 l (0.66 Imp.gal)

Quantity in expansion tank

.......0.4 l (0.088 Imp.gal)

•

Crank engine with starter while kneading hose 
between water pump and filler neck

•

Assemble motorcycle.

LT170010

1

3

2

LT170020

1

17.6

Removing and installing thermostat

•

Remove fuel tank.

•

Remove right side section of fairing.

•

Remove radiator cowling.

•

Remove cover (1).

•

Pull out thermostat (2).

Checking thermostat

•

Heat up thermostat in water bath.

•

Check start of opening and fully open setting.

Opening temperature:

Start of opening

..............................................85 °C

Fully open

.................................................... 105 °C

•

Install in the reverse order of removal.

X 

Tightening torque:

Cover

............................................................. 3 Nm

•

Top up coolant in the corresponding concentra-
tion.

LT170030

1

2

17.7

Removing and installing radiator

•

Remove fuel tank.

•

[RS] 

Remove bottom section of fairing 

•

Remove left/right side fairing.

•

Remove radiator cowling.

•

Remove air line (1).

•

Release connections (2,3,4) of the coolant hos-
es.

•

Disconnect plug connection (5) for fan motor.

•

Release hose connection (6) and mounting (7) for 
radiator.

•

Install in the reverse order of removal.

X 

Tightening torque:

Radiator

......................................................... 9 Nm

LT170040

5

4

3

2

LT170050

1

LT170060

7

6

17.8

Removing and installing fan

•

Remove radiator.

•

Remove rubber ring (1) and spacer bush (2).

•

Release retaining bolts (3, 4).

•

Install in the reverse order of removal.

LT170070

4

1

3

2

17.9

Removing and installing coolant 
hoses

•

Remove fuel tank.

•

[RS] 

Remove bottom section of fairing 

.

•

Remove left/right side fairings.

•

Remove corresponding coolant hose.

•

Remove radiator in order to release connections 
on coolant filler neck (1).

L

 Note:

Before screwing back in, clean the thread of micro-
encapsulated screw (2) and secure it with 

Loctite 243.

X 

Tightening torques:

Coolant filler neck to cylinder head (2)

........... 9 Nm

Temperature sensor to coolant filler neck (3)

30 Nm

LT170080

3

2

1

17.10

Checking cooling system

Checking cap for filler neck

•

Remove fuel tank.

•

Connect adapter (1), BMW No. 17 0 003, to  
pump, BMW No. 17 0 500. 

•

Screw cap onto screw coupling (2), 
BMW No. 17 0 004, and connect to pump.

•

Pressure test cap.

Pressure relief valve opens at

.. 1.5 bar (21.756 psi)

Checking coolant system for leaks

•

Screw pump, BMW No. 17 0 500, with adapter 
and screw coupling to filler neck.

•

Apply pressure to cooling system; pressure must 
remain unchanged for at least 10 minutes.

Test pressure

.............................. 1 bar (14.504 psi)

•

Install in the reverse order of removal.

17 0 004

LT170090

17 0 003

17 0 500

17.11

Troubleshooting

Coolant temperature warning lamp lights 
up.

no

Check coolant in expansion tank.
Is coolant level too low?

yes

Top up coolant.

no

Check thermostat.
Is thermostat defective?

yes

Replace thermostat.

no

Check water pump.
Is water pump defective?

yes

Repair/renew water pump.

Fan motor does not switch on.

no

Check fuse F7.
Is fuse defective?

yes

Renew fuse.

no

Check fan relay.
Is fan relay defective?

yes

Replace fan relay.

no

Check power circuit.
Does circuit have poor contact/break?

yes

Make contact/repair break.

no

Check fan motor.
Is fan motor defective?

yes

Repair/renew fan motor.

no

Check thermostat.
Thermostat does not open?

yes

Replace thermostat.

17.12

Übermäßiger Kühlmittelverlust.

no

Check coolant circuit.
Has coolant circuit a break?

yes

Repair break.