my heater fan just started acting up i would have to slam my passenger side door to get it to turn on for a while and it would make a weird nosie and the speed of the fan was slow. and now the fan does not turn on at all do i need to replace the blower motoror am i looking at something different

oh and its a 98 si

any info would be great
thanks

 

chcek the grounds, thats what mine was. It was a ground near my passenger firewall/fender. Also relays under the hood and the fusebox under the dash.