Yes, portable car heaters do work, but it is best to look at reviews of different kinds before purchasing them. Make sure to check whether it is simply a car heater or a car defrost/defogger.
no, you will have too order them online,
Most car heaters do not exceed 300 watts.
Yes, there is the option of a portable fridge that is specifically done for car use. Therefore this portable fridge is usually called a car fridge. This fridge uses a 12 Volt power supply.
Portable car heaters can be purchased from a variety of different retailers including car and auto stores (such as Canadian Tire), online through retailers such as Amazon or Ebay, or second-hand from retailers that sell used car parts.
Heaters work best set on floor allowing the hot air to rise through the car and heat more air.
You need a car stereo that it will connect to.
Yes, portable navigation systems can be used in any car. They are not programmed for specific cars they are programmed for the roads. It doesn't matter what car you have a GPS in it will work the same as if it was in another car.
yes, most 115 volt devices will work with any voltage from 100 to 130 volts with no problem.
SHORT TO GROUND
The portable model has a base that allows you to play the radio both in the car and at home.
Portable GPS units work anywhere, in any car or handheld. A factory installed GPS unit generally cannot be moved to another car.