Hello im a noob with accords and cars!

I seem to be having troubles with my heating system. I would have my car heated up to about 3/8 on the indicator, start my heater, it would blow warm air, but then would stop and continue to blow cold.
Is it the thermostat, or the heating core. I've considered my coolant but my temperature is reaching nominal levels, 3/8 of the way up.

Thank you.

 

the thermostat should be ok. make sure your cooling system is full. It is possible that the heater core is restricted but check the coolant level first.

 

OK so I've topped off my coolant and its set to the minimum set point on the reservoir, I started the car up let it run for a bit and there was still no heat coming through to my vents. Still blowing cold air, and my temperature gauge is still reading 3/8, worst thing i can think of is the heating core is messed up. Thinking of taking it in for a look, but wheres the fun in that.

 

try bleeding air out the system next