Hi. I have an 88 olds cutlass cierra and the fan hasn't worked for about a year now. I put up with it last winter but I don't want to do another year. It will produce heat but of course the heat only comes out when I get going about 30 mph or so. Is there a fuse that controls this because I couldn't find one. What else could be the problem and how do I fix it or do I need to take it to a repair shop. thanks for the help.