Weak heat causes?

[E.T.]

I've noticed that my heat isn't really hot. It's only luke warm. If I turn the fan up to 3 or 4, it seems to blow even cooler. A couple years ago, I had this problem and the flushed the system, which seemed to help a little. Over the summer, I had a new radiator and thermostat put in. I checked the coolant today and it's full. Any ideas as to what could be causing this?

 

[JLRockies]

Sounds like a thermostat stuck open.


Kooler than Mudd.

 

[Porkchop]

Plugged heater core is a good guess pull the lines and flush the heater core real good. That's were I would start. check vacuum line along the fire wall under the hood. If these don't work you may have to be pulling the dash apart but that's a hole new ball game so keep it simple first.

 

[Billwill]

I've noticed that my heat isn't really hot. It's only luke warm. If I turn the fan up to 3 or 4, it seems to blow even cooler. A couple years ago, I had this problem and the flushed the system, which seemed to help a little. Over the summer, I had a new radiator and thermostat put in. I checked the coolant today and it's full. Any ideas as to what could be causing this?

Did you refill with Orange HOAT anti-freeze?

If not then your heater core will be clogged up by now.

Have you bled out all air pockets?