how do you know if the axle on your car is broken?
You r low on coolant is why you dont have any heater and that why its running hot wile your stoped (thermostat and low coolant ) and the coolant leak is the (RIGHT REAR CORNER OF THE INTAKE MANIFOLD GASKET LEAKING ) and it is about $600.00, Just for the coolant leak and that will fix the running hot and no heater .good luck.
Could just refill your coolant first
depending on the style of axle assembly either the broke axle and wheel assy will exit and leave the car sitting on 3 wheels, if the ales have a bearing retainer the axle will stay in but it'll just free wheel, you could just jack up the one wheel assy and the wheel would spin in either direction.