should blower fan work with key on???

My 94 Passport 2.6 is acting up intermittent starting/running if it does start it runs smooth but if you rev it a few times it will start running rough then die out, but while I am trying to figure things out I noticed the blower does not come on with the key on until it starts up. Is there any engine controls on the same curcuit as the blower? or has anyone had the same problems???

any feedback would be apreciated

do a search for blower here. There is a relay that you can replace to solve this problem