Toro 25430A Operator's Manual page 57

1. Filler neck
2. Funnel
C. Close the vent valve.
D. Operate the engine for 5 minutes or until the
coolant temperature gauge in the instrument
cluster indicates 82°C (180°F), then stop the
engine.
CAUTION
The water is hot and can cause burns.
Stay away from the discharge end of the
coolant drain hose.
E. Open the drain valve (Figure 78) and drain the
water into a drain pan.
F. If the water drained from the radiator is dirty,
perform steps 2-A through 2-E until the water
drained from the radiator is clean.
G. Close the drain valve.
Filling the System with Coolant
Important: Fill the cooling system properly to prevent
air locks in the cooling passages. Failing to vent the
cooling system properly can damage it.
Note: Use a mixture of 50% ethylene glycol and 50% water
in the machine. The lowest ambient operating temperature
for this mixture is above -37°C (-34° F). If the ambient
temperature is lower, adjust the mixture. Use a mixture of
ethylene glycol and water in the machine all year.
1. Remove the radiator cap (Figure 76 and Figure 77).
2. Open the vent valve (Figure 76).
3. Fill the cooling radiator with the specified coolant
mixture until the fluid level is up to the top of the filler
neck (Figure 82).
Note: The coolant capacity of both the engine and
the radiator is 17.2 L (18.2 US qt).
Figure 81
3. Clean water
1. Coolant level (at the
bottom of the filler neck)
2. Filler neck
4. Close the vent valve.
5. Install the radiator cap.
6. Install the nose panel; refer to Installing the Nose Panel
(page 37).
7. Fill the coolant reservoir with coolant up to the Full
mark.
8. Install the coolant reservoir cap.
9. Start the engine and run it at half throttle for 5 minutes.
10. Stop the engine and remove the key.
11. Wait 30 minutes, then check the fluid level in the
coolant reservoir. If it is low, add coolant.
12. Install the side panels; refer to Installing the Side Panels
(page 36).
57
Figure 82
3. Coolant (a mixture of 50%
ethylene glycol and 50%
water)