Nissan Repair: Heater in my car does not work????, heater core, thermostat

Question
Hi Von, The heater in my car does not work, it doesnt blow warm/hot air. It works sometimes but not for long.
Can you please help me???     Thanks      -Jay M

Answer
Jay,

First, check and make sure the hoses are not plugged and remove one and blow through the heater core to make sure it is not plugged up.  If it is not then check the temperature and if it is running cold replace the thermostat.  Lastly, check the blend doors under the dash to make sure they are working so the door that isolates the heater core is working properly.