Started last summer. I can run ac/ heat blower fan on speed 1, 2, 3 all day long with no problems, but when I move to high speed it blows hvac fuse under driver seat. Sometimes it will run for 30 min before it blows and sometimes might be 5 min. I have replaced blower motor, blower motor resister hoping to resolve the issue but still blows fuse. I have tried a 30amp fuse (i know not recommended for 20amp cir)trying to figure if a dead short or thinking it could be my old blower motor drawing too many amps. Blows that too just as quick! I am an electrician by trade, and have put clamp meter on to check draw of motor. Even old motor was not over drawing. Any thoughts? Most internet searches I found deal with running on high speed only resistor issues but cant find any for my problem.
have the same problem?
Wednesday, May 30th, 2012 AT 9:54 PM