Does anyone have any experience with those portable interior cab heaters that plug into the lighter? My 1992 F150 work truck has lost its heat and its going to cost $400 to do all thats needed to get it to work again. Its not just the thermostat. I just put a new tranny in it so trying not to spend anymore on this oldie but goodie.

I see many reasonably priced 12V heaters that plug into the lighter and wondered if anyone has ever tried to use them? I just need 'some' warmth on my hands/feet. I am a contractor and the heat has not worked well for two years but usually I work close to home so its not been an issue but its gotten very cold here in Northern Virginia all of a sudden and my work is taking me an hour away and I am freezing!

Help would be appreciated.

Thanks
Norman