Vacuum Leak

[gbaileyo7]

When i am driving with Max AC on and i put the engine under a load the blower switches by its self from "vent or Max AC" to defrost and once i let off the accelerator it goes back. What the heck is that?

 

[Devin]

Does the EATC confirm that?

 

[gbaileyo7]

It says that its still on Max AC but it blows out of the defrost when the engine is under a load.

 

[Devin]

Have you tried unplugging the supply (between the heater core tubes) and driving like that to see if the behavior changes?

 

[gbaileyo7]

What does it supply? Vacuum? To answer your question, no i haven't.