Last week I was driving my '86 K5 Blazer home from having Thanksgiving in West Texas. It was a bit cold outside, so I had the heater and fan motor blowing on the second to slowest speed. After running a couple hours I started smelling the distinct smell of hot plastic, and I noticed the fan stopped blowing. I know the smell of melting plastic very well, and that's what I was smelling. I immediately turned the fan off, and I rolled the windows down to vent out the toxic stench. The next day I turned the fan motor on for about 1 to 2 seconds to test. The fan seemed to run fine, but I immediate turned it off again before I burned anything up.
I have never had any vent or fan issues to date with the exception of replacing the fan motor about 3 years ago with an Autozone rebuild. I guess I am most concerned about the hot plastic smell, and I'm scared to death that the wiring might be damaged. Last thing I need is to melt the fan circuit wiring and/or burn the truck down. A normal person would expect a fuse to pop before a large load to build up on a fan circuit, so I'm confused where the hot plastic smell would come from. Does anyone have any words to wisdom or troubleshooting pointers you could pass along to me?
I have never had any vent or fan issues to date with the exception of replacing the fan motor about 3 years ago with an Autozone rebuild. I guess I am most concerned about the hot plastic smell, and I'm scared to death that the wiring might be damaged. Last thing I need is to melt the fan circuit wiring and/or burn the truck down. A normal person would expect a fuse to pop before a large load to build up on a fan circuit, so I'm confused where the hot plastic smell would come from. Does anyone have any words to wisdom or troubleshooting pointers you could pass along to me?
