Derbi Rambla 250 Manual page 225

Cooling system
Check
1) Visually check that the thermostat is not dam-
aged.
2) Fill a metal container with approx. 1 litre of wa-
ter.
Immerse the thermostat, and keep it in the centre
of the container.
Immerse the multimeter thermometer probe, and
keep it close to the thermostat.
Heat up the container using the thermal gun.
Check the temperature when the thermostat starts
to open:
Heat to obtain the thermostat full opening
3) Replace the thermostat if it is not working prop-
erly.
CAUTION
MAKE SURE NEITHER THE THERMOSTAT NOR THE
THERMOMETER TOUCHES THE CONTAINER FOR A COR-
RECT TEST PERFORMANCE.
Specific tooling
020331Y Digital multimeter
020151Y Heat gun
Characteristic
Thermostat check: Opening start temperature
69.5 ÷ 72.5 °C
COOL SYS - 225