A/C stuck in Defrost?

[SuperDave456]

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?

Thanks!

 

[JHZR2]

Vacuum actuator?

 

[punisher]

Defrost is default in case of a vac leak. The most common vac problem is the fresh/recirc vac line connector in the passenger footwell. Ck to make sure it isn't knocked off.

 

[01rangerxl]

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).

 

[Rand]

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?

 

[bdcardinal]

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.