I took a heater core out of an ford truck and a dash fan out of another old truck and made a heater for my Mustang. mounted it betreen my legs with the fan blowing on the door. worked great, but the trick to keep from fogging up is to have outside air feed your heater, mine came from a crack below the door. Most cars and trucks feed the heating system through a vents. unless you want the sauna effect. cracking a window might work too. I hooked up to the existing fitting on the block for stock heater, you can mount a gate valve on one of the hoses to regulate heat and I piggy backed wiring to to the fuse block with a toggle switch and in line fuse. I took it out in the spring and installed it when it got cold.scott