Check the battery as follows:
Battery exterior
Make sure that the battery terminals are not corroded and that there are no loose connections, cracks, or loose clamps.

Brake fluid
Before rechargingOn-vehicle inspection
1. INSPECT COOLING SYSTEM FOR LEAKS
(a) Remove the radiator cap.
CAUTION:
Do not remove the radiator cap while the engine and radiator
are still hot. Pressurized, hot engine coolant and steam
may be released and cause serious burns.
(b) Fill the radiator with coolant and attach a radiator ...