How to change the thermostat on a Kia Sephia, 2001? I sudennly noticed the temperature rose to almost the Hot mark so I immediately wound down the windows and turned up the fan full blast and cranked up the heat to max and switched the vents on. I noticed the gauge dropping and then rose again. This happened about 5 times before I made it home. Now I wish to attempt to change it. I can hear the fan running so I know that it is not the fan. Now where is the location of the thermostat?

it is located on the engine (block - in the front).

Make sure the engine is completely cool prior to working on the engine. Then place the drain pan underneath the radiator. Open the petcock at the base and let out approximately 1 gallon of coolant.

Unbolt the thermostat housing from the front of the engine using the 3/8-inch ratchet and socket. Coolant will pour out at this point, so be ready for it and aim the hose toward the drain pan if possible. Remove the thermostat and the thermostat gasket.

Clean all of the mating surfaces on the engine and thermostat housing using the gasket scraper. Then install a replacement thermostat in the housing, with the thermostat orienting the same way as the original. Then install the gasket and the thermostat housing on top of it. Bolt it in place using the 3/8-inch ratchet and socket.

Open the radiator cap and fill the radiator with the 50-50 pre-diluted coolant. Turn on the car and let it run for 15 minutes while the interior heat is set on the "high" position. Allow the car to cool for an hour, then add any additional coolant needed