Check the condition and connections of all cooling system hoses and heater hoses. Replace any swollen or deteriorated hoses.
The coolant level should be filled between MAX and MIN marks on the side of the coolant reservoir when the engine is cool.
If the coolant level is low, add enough specified coolant to provide protection against freezing and corrosion. Bring the level to MAX, but do not overfill. If frequent additions are required, we recommend that the system be inspected by an authorized Kia dealer.
Kia Niro (DE HEV) Owners Manual: Brake fluid
Checking the brake fluid level
Check the fluid level in the reservoir periodically. The fluid level should be
between MAX and MIN marks on the side of the reservoir.
Before removing the reservoir cap and adding brake fluid, clean the area around
the reservoir cap thoroughly to prevent brake ...
Kia Niro 2017 (DE HEV) Service Manual: Engine Room Under Cover Repair procedures
Removal
Engine room under cover.
1.
Remove the engine room under cover (A).
Tightening torque :
3.9 - 5.9 N·m (0.4 - 0.6 kgf·m, 2.9 - 4.3 lb·ft)
2.
Install in the reverse order of removal.
...