2012 3500HD Heat not blowing very hot

[bad*news*cj5]

My 2012 3500HD heat has not been blowing very hot any more. What do you think is the problem?

 

[CasterTroy]

Flush the heater core. If that doesn't work it may be the blend door sticking

 

[Ron]

Blend door.
Needs programmed reset. Ongoing gm problem in these years

 

[shawn]

Is the engine actually reaching temp?

If it is, run the hvac recalibration routine.

 

[jeepinmatt]

The tri-linear dislostiphicator has probably become unaligned with the malfeasant renegrometer.

 

[Infamous1]

How is it that the only bullshit answer in a tech thread gets likes?

Like was said, make sure engine is reaching temp and then verify both heater core lines are hot then suspect blend doors.

 

[jeepinmatt]

How is it that the only bullshit answer in a tech thread gets likes?

Like was said, make sure engine is reaching temp and then verify both heater core lines are hot then suspect blend doors.

Happy now?

Maybe people like a good laugh. I guess I could have just restated what was already said, but that also didn't seem productive. Sorry about your feeling.