I have a 2000 Nissan Xterra and the 2 blower fuses keep blowing causing the the heat not to work. When I went to switch out the fuses the first time the motor and heat worked right away but only for a minute or so when the fuses blew again. What would cause this to happen, is the blowor motor bad or could some other heating/cooling componen broken? Thanks,

You have a problem with the motor circuit drawing more amperage than the fuse will allow. it could be the motor itself, or something that is keep the motor from turning freely. otherwise it's a wiring problem. i would suggest unplugging the motor, and then turning on the fan. hopefully, if there is some short to ground, which sounds unlikely, the fuse will blow. otherwise i suggest replacing the blower motor. good luck!