2003 Isuzu Rodeo Question Fan

The fan on my rodeo works only sometimes. I get in the car in the morning and turn the fan to high and works fine and then I hit the A/C switch everything fine. Later I get in the car and fan does not come on at all but when I do turn it to high with no air blowing and hit the A/C switch I hear a click but still nothing. I have replaced elec fan fuse and the high and low fan fuses as well as the two small blower fuses and nothing. Can you please help have pregnant wife and needs this fixed soon its really hot outside.