'03 No Heat

[Ducksrus]

Have an '03 where the heat does not come on. Both lines to the heater block are hot, coolant level is fine, T-stat appears to be working properly. A/C works & responds according to the set temp & in all positions of mode control. Do have a humming sound from right side of console that was thinking maybe this is some type of actuator issue & a diverter is not opening for the heat; however, not sure.
Probably time for coolant change, but do not think that is part of the issue & heat was working last winter.
Thoughts?

 

[AuSeeker]

Have an '03 where the heat does not come on. Both lines to the heater block are hot, coolant level is fine, T-stat appears to be working properly. A/C works & responds according to the set temp & in all positions of mode control. Do have a humming sound from right side of console that was thinking maybe this is some type of actuator issue & a diverter is not opening for the heat; however, not sure.
Probably time for coolant change, but do not think that is part of the issue & heat was working last winter.
Thoughts?

Very possible that the "Blend" door actuator is not working correctly and stuck in the AC position.

 

[Ducksrus]

Pulled some panels off & found a small motor on side of HVAC unit where the humming sound originates. Not sure that is the issue, but have pic/video of what is going on & will try to find a parts diagram & replace the part, I think. Not much room under there & do not see much of how the motor is mounted.
Thanks