Toyota Hilux Owner's Manual page 489

Add engine coolant if necessary. (→P. 504)
5
Water can be used in an emergency if engine coolant is unavailable.
1GR-FE engine
1GD-FTV and 2GD-FTV
engines
Start the engine to check that the radiator cooling fan operates and
6
to check for coolant leaks from the radiator or hoses.
If the fan is not operating:
7
Stop the engine immediately and contact your Toyota dealer.
If the fan is operating:
Have the vehicle inspected at the nearest Toyota dealer.
8-2. Steps to take in an emergency
2TR-FE engine
487
8