Thread: Heater blows cold when set to hot and blows hot when set to cold??????

Hi, I have a 2006 GT with the dual auto climate control. Recently I noticed that it was not blowing hot air. So I checked the following:

1. The coolant level: looked good
2. The hoses entering and exiting the heater core. : Both were hot..
3. I checked the actuator that controls the heater flap and it seem to be operating properly.

So I tried to adjust the temperature up to 90 degrees and it continued to blow cool air with the car at running temperature. So I set the temperature to 60 degrees and it start blowing hot air?? If I then turn the AC on it will start blowing cold? What would make it work in reverse. When I set the temp to 60 it blows the air out of the front vents (Hot) if I set it to 90 it blow cold air down on the floor. So it seems to be sending the air to the right place, just the opposite temperature?

Any help would be appreciated?

Thanks!

Hi, thank you for the advice. I appreciate your help. I think you are correct about pulling the heat from the Engine as now it only blows cold no matter the setting. I put in a new blend actuator just to make sure that the original one wasn't the issue and it had no positive effect. The actuator is definitely working. I physically moved the blend door by turning the knob with the actuator removed and it didn't seem to matter if it was open or closed as it still was pulling cold air. I double checked the hoses going in to the heater core and again both are hot. Is there another actuator that would effect the air flow through the core?

Update. . I had an air pocket in the heater core. Flushed the system and now everything is working great.

Ironically both hoses were hot, I think both hoses were getting hot but not actually flowing through the core. When I disconnected the hoses, I actually filled up the core as it was nearly empty. For what ever reason the coolant would get hot on both lines. The coolant flush seemed to be the final trick. Thank you again for the help.