Gray Vacuum Hose 97 Grand Am

HVAC diverter knob does nothing.. - GrandAmGT.com Forum

When I have the A / C on, everything else works except for derivative control. Temp work, the fan speeds up the work. But no matter what I do with the third button, the air reaches the vents still face (seems slightly less dash above those too) .. Is this a problem in the HVAC unit or is the problem of a relay or something else? Not a big deal now, but if I have to defrost or warm in the winter my feet, it will be a problem then .. If there is a vacuum leak in one of these lines, the controls do not work properly, if at all. Check lines and connections for cracks or signs they get dry and old.The main line power vacuum is a gray plastic tube that runs through the wiring harness in the engine compartment and connects to the intake manifold next to the upper pressure regulator fuel. Make sure the line is connected and not cracked or broken. He sees a lot of heat and can be damaged once it is old. Once it goes in the main beam is completed every son and passes through one of the large rubber grommets in the heat (greater than I think it is?) Wall, then back under the dashboard and comes on the harness somewhere behind the dashboard. It's not easy to see.If you really really want to find all this, you will have to remove many of the interior trim and some parts inside the engine compartment, and unpack a LOT of wire loom.

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