You will need to remove the locking wire connector first. With water temperature sensors you may also have partially or fully drain the coolant and remove with the appropriate wrench.
This depends on the year but purchase a haynes manual from an auto parts store, along with the sensor. Locate the sensor, remove lead, replace sensor, and attach lead.
A must have matching sensor with the maker brand of your Hyundai Santa Fe v-6. 1. Remove locking wire connector. 2. Partially or fully drain the coolant/remove with correct wrench. 3. Put new one in turning it with an open end wrench. 4. User manual for a schematic. 5. Consult licensed mechanic if you're a novice and needs help.
you'll need to cut the wire and install a deep socket to break the old one loose. Then,you'll need to install the new turning it with an open end wrench