my guess Is blown headgasket
this could be multiple reasons, however 2003 and 2004 sorento are prone to a coolant reservoir failure. This typically begins on the bottom side of the reservoir. Change it or else!
Your heater core has failed.
The 2003 Kia Sorento has 24 valves.
The 2003 Kia Sorento has a V6 engine.
where is the pcv valve on a 2003 kia sorento
The 2003 Kia Sorento is a gas-powered vehicle.
The 2003 Kia Sorento has a 4-speed automatic.
If its a diesel Sorento, it doesn't.
The 2003 Kia Sorento has double overhead cam (DOHC).
The 2003 Kia Sorento has a 28.4 degrees angle of approach.
The 2003 Kia Sorento is 14 ft. 11.8 in. (179.8 in.) long.
The 2003 Kia Sorento's turning circle is 36.4 ft..