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Discussion Starter · #1 ·
We purchased the 2009 sport trac last night from family friends and noticed on our way home with it, when I switched the vent control from the front facing vents to defrost(it was humid and windshield fogging up) the air didn't switch from the front facing vents to defrost vents on top of dash. So I switched it to just the floor vents and same thing. AC(or air) only comes out of the regular front vents only. AC and heat both do work though. Is this something my son(he's almost 17) can diy or do we need to take it in? What is the possible cause? Thanks!
 

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How cold is the air. Given that it's a 2009, it could be low on charge. If you are not getting the return line down to 45°F, you're not pulling much moisture and it can have a reverse effect when trying to defog the windshield.

The return line (compressor suction) will be the thicker one going from the firewall to the compressor.
 
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