Car over heats then cools no heating in car

Hello there:
This problem normally is caused by a couple of things that you can check
First start the vehical and open the radiator cap and look to see if you can see the water inside the radiator moving around if not you might have a clogged radiator or the water pump is bad
now when the car is getting hot try to hold and squeese the top radiator hose to see if it is hard and you cant squeeze it than this will tell you that the thermostat is not opening up and letting the water thru to cool the engine or that it is only letting some of the water thru in any case i would replace the thermostat first and then follow the other troubleshooting steps that i have provided ok and you should be ok after making the needed repairs.
Hope this has been very helpful for you
Best regards Michael

First thing you need to do is check coolant level when engine is cool. Take rad cap off, and start engine with HEATER ON (not defrost) and let it run until up to normal operating temperature, and keep adding coolant as needed to top up rad. Wait until rad fan comes on 2 or 3 times before you put rad cap back on, or at least wait until you see coolant flow through rad increase, indicating thermostat has opened, 2 or 2 times, then put cap back on, top up coolant return bottle, and run it for a while, but watch level in return bottle, and top up as needed. If it keeps going down, start investigating for a leak in cooling system, which I would do anyway, if I find it is low. If thermostat hasn't been changed in a while, now would be a good time to do it as well. Let me know how you make out.

Pull thermostat,check thermostat in boiling water w/candy thermometer to see if thermostatopens @ correct temp,if thermo works,check heater core/water passages for blockage....