what would be the temp in a car parked in the sun, when the outside temp is 86 degrees farenheit?

That partly depends upon the color of the inside of the car but on average the inside temperature would be about 114 F if the outside air temp was 86F. This figure was taken from an actual test with the windows closed.

It really depends on how much sunlight there is and how strong the sun is and how long it's been parked there. There is no definite answer but I would say between 110 and 120 degrees. If it's mostly cloudy out then it wouldn't be much more than the air temp. Some of the more hotter days would make it go up to 150 inside the car.

Depends on things like the color the car, and if all the windows are rolled up, and how long it has sat in the sun. I would guess 105 - 115 F, but it could be more.