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There are fuses inside the car and under the hood. Check owners manual and investigate possible fuse blown. Ac,blower motor, dash, ac clutch, ac relay, blower relay. Always disconnect battery when working with anything electrical. Saves headaches
Have your battery checked. A weak battery (Sorentos all have lousy stock batteries) may allow electrical spikes to blow lamps. Also make sure your battery cables are tight.
Note: The stock battery on 2003 and 2004 Sorentos V-6 models is a group 24. The group 34 battery is a better choice with more CCA and reserve capacity bit may require minor modifications to the battery tray or hold-down clamp.
Make sure you're using good quality headlamp bulbs. Auto-parts stores with lamps behind the counter are often higher quality than blister-pak lamps from Wally-World.