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Kenny Z.
Kenny Z., Ford Senior Master Tech
Category: Ford
Satisfied Customers: 5443
Experience:  Auto Trans, Drivability and Electrical Specialist
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When I turn my AC on Air does not come out of the vents it

Customer Question

When I turn my AC on Air does not come out of the vents it comes out of defroster. When I turn the climate control to heat it still blows cool coming out of defroster. This is on a 2007 Mustang GT
Submitted: 1 year ago.
Category: Ford
Expert:  Kenny Z. replied 1 year ago.

Hello, my name is***** and thanks for your question.

It sounds to me like you lost the control head. Check fuses 10 and 12 in the interior fuse box, make sure they have power on both sides with the key in the run position. If both fuses have power than replace the control head.

There would have to be 3 bad actuators or multiple bad wires for this symptom to occur as you described. I bet the fresh air mode is not working either.

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Customer: replied 1 year ago.
What are you calling control head?
I have power at both fuses both sides.
It work fine yesterday.
Expert:  Kenny Z. replied 1 year ago.

The control head is the unit with the climate control controls (knobs) on it. It is all one assembly. You can try disconnecting the battery and touching the terminals together, this will cause a complete hard reset of the control head.

Customer: replied 1 year ago.
I pulled both terminals off the battery touch them together my heater is working.
All air is still coming out of defroster and floor.
Expert:  Kenny Z. replied 1 year ago.

Can you tell if the fresh air/recirc door is working when on max a/c?

Customer: replied 1 year ago.
How would i tell that.
Expert:  Kenny Z. replied 1 year ago.

If you have the blower on high and the a/c in any position other than max then change it to max you should a significant change in the airflow sound if it is switching.

Customer: replied 1 year ago.
that is working fine.
Expert:  Kenny Z. replied 1 year ago.

Does the recirc button light up in he max position and go out when you press it

Customer: replied 1 year ago.
Expert:  Kenny Z. replied 1 year ago.

Do any other modes work or is defrost in every position? (there is always a little bleed to floor when in defrost)

Expert:  Kenny Z. replied 1 year ago.

This is your next step:

HVAC Module Cold Boot Process

The purpose of the cold boot process is to allow the HVAC module to reinitialize and calibrate the actuators. To carry out the cold boot process, follow the steps below.

  • Turn the ignition switch to the OFF position.
  • Disconnect the HVAC module electrical connectors.
  • Inspect the module connectors for:
    • corrosion.
    • pushed-out pins.
    • incorrectly seated connector.
  • Wait one minute.
  • Connect the HVAC module electrical connectors.
  • Turn the ignition switch to the ON position.
  • Select any position except OFF on the HVAC module.

The HVAC module will now initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.

Customer: replied 1 year ago.
Where is the hvac module?
Expert:  Kenny Z. replied 1 year ago.

Its all one unit, the knobs are attached to it. To access console has to come out and center finish panel.

Customer: replied 1 year ago.
Cool ill try it.
Expert:  Kenny Z. replied 1 year ago.

OK

Customer: replied 1 year ago.
I did the recalibration and still does not work still coming out of the defroster
Expert:  Kenny Z. replied 1 year ago.

It still sounds like the module is bad, need to perform pinpoint test at link below to confirm.

https://www.dropbox.com/s/oazt4y8jlmv7eqe/climate.pdf?dl=0

Customer: replied 1 year ago.
I decided to replace the acculator that supplies the vent/ defroster is working fine now.
Expert:  Kenny Z. replied 1 year ago.

That's good news, at least it was the easy one.