The heater is not working in the car it only blows cold air even when the engine is hot. Could this be something simple or is it a garage repair job?
I don’t know the car, but likely it is the blend door. On some cars it is vacuum driven so any vacuum problem can cause the problem. Find a vacuum hose map and start checking for cracked or disconnected hoses. It may also be electric controlled or mechanically controlled. Other than that you could have a bad heater hose or even a bad thermostat.