Does the engine need to be on for heat?
Does the engine need to be on for heat? A: Yes, but indirectly. Gas is required to run the engine which produces heat. Using the heater does not affect fuel efficiency as opposed to the air conditioner, as the heated outdoor air is simply being redirected and moved into the cabin. Q: Why Is My Car Heater Not Getting Warm? Why is my Dodge Ram not blowing hot air? If they are both hot the truck should be blowing hot air. You would have a problem with the temp blend door inside the dash. If the hose coming out is...