When the wipers no longer clean adequately, the blades may be worn or cracked, and require replacement.
CAUTION
To prevent damage to the wiper arms or other components, do not attempt to move the wipers manually.
CAUTION
The use of a non-specified wiper blade could result in wiper malfunction and failure.
Kia Niro 2017 (DE HEV) Service Manual: Drive Shafts and Boots Repair procedures
Inspection
1.
Check the drive shaft boots for loose clamps, cracks, grease leaks, kinks
or damage.
...
Kia Niro (DE HEV) Owners Manual: Driving on grades
Reduce speed and shift to a lower gear before you start down a long or steep
downgrade. If you don’t shift down, you might have to use your brakes so much that
they would get hot and no longer operate efficiently.
On a long uphill grade, shift down and reduce your speed to around 70 km/h (45 ...