I realize there was a similar question asked a few weeks ago by doing a search, but I'm stuck. My problem is my fan switch on my dash, whether on low or high, will not allow the fan to blow air out. I replaced the blower motor a while back, and just replaced the fan switch last week but still nothing. I know I have heat because I can feel it coming out the vent, but I can't get the fan to blow it out. I went and bought a relay, but can't seem to find where the relay goes. There is no relay near my blower motor (that I can see). I'm stuck. Does anyone know where the relay is or what could be the problem? My blazer is an 89 with a 350. Thanks.