Any thoughts on what to check when I can't adjust airflow(hot or cold) by turning the control. The air only comes out at window...

 

Go read the FAQs in the HVAC section. Is there an echo in here????

Please do NOT start new threads for the same thing....

 

If I new where the HVAC section was I would surely read it.

I was trying to refrase the first ? as I don't know how to delete it.

Sorry to cause a problem..........

 

No problem here. Just go to the top of this page and click on FAQ and then type in what you are looking for.

 

Jterr- the air is directed to the defrost, dash or floor by vacuum cylinders. If things dont change, you probalby do not have good vacuum. Normally you wil end up with defrost only when you loose vacuum. Read the related posts and look for vacuum leaks under the hood on the small vacuum hoses in front of glove box and motor at the firewall.

 

My 97' Expedition I had did the same exact thing. It ended up being a cracked vacuum line near the battery. Them lines get brittle when they get old.

 

Thanks Guys,
Found the culprit as y'all said. Fixed and all is well.....