How to fix car blowing hot air when AC is on. It's actually a really simple process to refill your car or van air conditioning. Just buy a can of freon and a gauge to connect everything. Squeeze the trigger until the can is empty and your AC should be blowing cold air. I did find out that my system was so low that the small can wasn't enough and i should have bought a second can to get the car to blow really cold air.
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