Troubleshooting - BMW k 1200 rs Repair Manual

Troubleshooting

Coolant overheat warning light comes on.
Check coolant in expansion tank. Is coolant
level too low?
no
Check thermostat. Thermostat does not open.
Is the left radiator warmer than the right, and
the coolant pipe to the water pump hot?
no
Test the water pump. Is water pump faulty?
Fan motor does not cut in.
Check fuse F7. Fuse blown?
no
Check fan relay. Fan relay defective?
no
Check electrical circuit. Poor contact/break in
circuit?
no
Check fan motor. Fan motor defective?
no
Check thermostat. Thermostat does not open.
Is the left radiator warmer than the right, and
the coolant pipe to the water pump hot?
17.12
yes
Add coolant.
yes
Replace thermostat.
yes
Repair/replace water pump.
yes
Replace fuse
yes
Replace fan relay.
yes
Make good contact/eliminate break in circuit.
yes
Repair/replace fan motor.
yes
Replace thermostat.