Heater and defroster don't work well

Connie this sounds like your thermostat in the engine is stuck open not letting the water stay in the engine block to heat up. The fix is to replace the thermostat with a new one that will allow the water to stay in the block to warm up. The typical symptoms of a stuck open thermostat is that the air will blow somewhat warm but never hot in the winter time, but it will take a few miles for the air to warm up at all. I would check with the dealership and find out what degree thermostat to replace it with. I run a 180 degree in the summer and a 195 degree thermostat in the winter just to have hot heat in the winter. I hope this helps