Linhai HY740STL 2018 Service Manual page 202

CHAPTER 8 ELECTRICAL
5. Fan motor(inspection 1)
Connect the battery to the fan motor.
Battery (+) lead→Green/Blue terminal

Battery (-) lead→Green ground 
Check the fan motor operation
Fan motor (inspection 2)
Turn the main switch to off.
⚫Remove the thermo switch lead from
thermo switch.
⚫Connect jumper lead to thermo switch
leads.
⚫Turn the main switch to on
6. Thermo switch
Remove the thermo switch from the
radiator.
⚫Connect the pocket tester (ΩX1) to the
thermo switch.
⚫Immerse the thermo switch in the
water 
⚫Check the thermo switch for continuity.
NOTE:
Measure temperatures while heating the
coolant with the temperature gauge
WARNING
⚫Handle the thermo switch with special
care.
Never subject it to strong shocks or
allow it to be dropped. Should it be
dropped, it must be replaced.
⚫Do not touch the thermo switch to the
bottom of the heated vessel.
88±3℃Thermo switch "ON"
80 ℃Thermo switch "OFF"
M550 SERVICE MANUAL 16.0
DOES NOT MOVE
Replace fan motor
DOES NOT MOVE
The wiring circuit from battery to
fan motor is faulty. Repair
OUT OF SPECIFICATION
Replace the thermo switch
CHAPTER 7 ELECTRICAL CTRICAL PAGE 8- 20