After the car is warmed up I have no heat at idle.While driving the heat is normal.As soon as I come to a stop no heat at all.It goes cold.The car has never overheated.It still runs like normal.Ive seen alot of people with the same problem but no fix was posted.Suggestions??Engine temps are always normal.

03 civic ex

 

Please search next time.

The following are common issues with "no heat" from the heater:
1. low coolant
2. worn thermostat
3. heatercore blockage
4. headgasket leak