Sym GTS 250 Service Manual page 139

12. Cooling System
Preceding page
E. Keep eng. 3000~4000 rpm
and inspect cooling fan was
operating after the
temperature gauge over 3
checks?
Y
F. Confirm the cooling fan was
convulsion?
Y
Meter unusual
If circuit connects reverse
cooling fan will forward,
correct and check again.
To this chapter contents
E-1. Measure thermal switch to
N
confirm voltage be
changed (12¡ ÷ 0V)?
E-2. Connect cooling fan
terminals with battery
(12V) directly to inspect
its operation?
E-3. Keep eng. 3000~4000
rpm and inspect coolant
flow into reserve tank
after the temperature
gauge over 3 checks?
E-4. Remove thermostat from
holder then heats it by
water directly to check its
operation?
For bleed the air bubbles
completely, open radiator cap
and start engine while engine
is cool then press water hose
softly by hand to bleeding.
Turn the throttle repeatedly
until the coolant surface
becomes stable.
N
Y
N
Y
Y
N
Y
Notice the water hose
can't any unsuitable
bend or twist and
bleed the air bubbles
completely.
Replace thermal switch
Replace cooling fan
Replace thermostat
Refill with coolant then
check again
12-4