I have a 2004 Mustang,The a/c is cold but blows through the defrost vents all the time no matter what position the switch is in,any help,please email me at email@example.com,thx in advance
Sorry, I don't do personal e-mail correspondence. Your vehicle has a vacuum concern. Either the vacuum line from the manifold to the vacuum tee is broken, the vacuum check valve is malfunctioning or the vacuum reservoir leaks. The other malfunction could be at the control head or a vacuum connection under the dash. Under the hood, it's the vacuum line that runs through the firewall on the right side near the heater hose connections.
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