I've got a serious problem.
My A/C is stuck in Defrost.
2002 Ford Taurus, 200,600 miles.
It blows cold, but today when I jumped in it was stuck.
Anyone know how to unstick this one?
I know its on the passengers side front... but where?
Something is loose/disconnected in the vacuum control system. It defaults to defrost if something is amiss.
When this happened on my '95 Explorer, it was a vacuum line that became disconnected from the vacuum reservoir (plastic sphere under the hood).
usually 99% of the time stuck in defrost is a vacuum leak.
Start there, was any work done recently, in the underhood area, any accidents/road trash, any interior work done.. such as aftermarket stereo?
Broken vacuum line. The system is designed to default to defrost when there is a lack of vacuum. Find the vacuum manifold and trace the hard line to the firewall and there will be a break in it somewhere.