I started having a problem with the heat working. I could hear the air coming out but it was cold. I pulled the button off and noticed the bolt was lose so I tightened it and it worked fine. As time went on i had to tighten it more often and then eventually I had to tighten it and apply pressure. Being broke I wedged a penny on the side of the dial (to permenantly apply pressure) and it worked (sometimes). Now when I turn the heat on nothing happens unless it is as high as it can go and it gives a VERY loud rrrrrrrrrrrrrrrrr noise. Like the fan is running high speed but I get little or no heat not to mention how annoying the sound is. Winter is here and I have three children and have to have heat... what do I do?