Air Conditioning and Coolant

Why is the air conditioner cooler while driving?

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2004-07-01 13:33:49
2004-07-01 13:33:49

There are two reasons. First the engine is running faster. The AC works by compressing the coolant gas (which heats it up), letting it cool outside the car, then letting it expand (which makes it cool) and letting it absorb heat from inside the car. The compression of the gas takes a lot of force, and that force is coming from your engine itself. Running the engine at a higher RPM gives more available energy to push that "heat cycle" along. The second reason is this: The coolent, once it is compressed and hot, must give up it's heat to the outside air. (There is nowhere else to give it!) The coolent goes through coils to help this, but it's just like any other hot object--it will cool faster if there is air blowing over it. The motion of the car helps provide this aitflow. This is why you AC works best when the car is running. It will work even better when the air is below zero--although you probably won't need it then. :)

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