Q: Can I drive my car with a broken coolant reservoir

Hi there. You sure can drive your vehicle with a broken reservoir bottle. However, if the cooling system runs low and the bottle cannot provide the needed coolant to keep it at operating levels, then the engine could begin to show the signs. The signs of low coolant will be: engine overheating, air conditioner not working, loss of power, internal engine damage, external engine component damage, radiator damage, thermostat damage, etc... As you can see, one small problem can eventually snowball into many and/or much larger problems. I suggest having the bottle replaced and the coolant level inspected to avoid future concerns. Your Mechanic has several available technicians that can assist you with a reservoir bottle replacement and coolant level inspection.