Hi,
I have a 2002 Nissan Sentra GXE and just today i noticed the heater would not generate the usual heat it normally does. It's a lot cooler. When the car is idle, when either parking or waiting at a stop light, the heat coming out of the vents is much cooler. Once I give it some gas and rev the engine, the heater gets warm again.
Can someone confirm that this is a thermostat problem? Also, I just flushed the coolant this morning. I noticed this problem after I flushed the coolant.
Thanks in advance! VN