i have an 02 explorer. it wouldnt switch into 4 wheel high or low. so i went under the hood and checked the two fuses for the 4x4.(#17 & 18) i took them out and they looked fine. so i put them back in. i started my car and the four wheel drive worked it went into four high and low. but the next day it didnt work again. so i took out the fuses and put them back in and it worked agian. but now it wont work. anyone know what could be causing this to happen ????????also sometimes i turn the car on and its stuck in 4x4 low and wont come out of it.????? also maybe twice a month my o/d light starts blinking. so i turn off the car and start it up again and its fine.