My heating just stopped working as I was driving what can be wrong with it

Check your coolant level after the engine has cooled and check radiator reservoir also . Its best to check with the engine cold because it more of a precise level then with the engine at operating temp. Plus you take a chance a getting burned really bad checking the antifreeze with the engine at operating temp also. On the side of the reservoir is a max fill line somewhere about half way down and with the engine cold,that's where the antifreeze level should be when its full. The reason the max line isn't at the top is because of expansion when the engine temp rises. Good luck and stay safe and keep us posted!