When you turn the temperature to hot the air blows out the vent panel, turn the temperature on cold and the air blows out the defroster

Tiny
KENNETH KAHREN
  • MEMBER
  • 1999 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 166,626 MILES
Air flow is strong out defroster and weak out the vent panels.
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Tuesday, December 17th, 2019 AT 7:05 PM

1 Reply

Tiny
SCGRANTURISMO
  • EXPERT
Hello,

This sounds to me like you have the mode electrical connector and the temperature electrical connectors switched or the wires have a short between circuits. In the diagrams down below I have included the instructions for the removal and installation of the Heating Ventilation and Air Conditioning [HVAC] control unit and the electrical HVAC components in the diagrams down below. I have also included guides for shorts between electrical circuits, shorts to power, and shorts to grounds for you as well. You will need to use a Digital Multi Meter [DMM] to use these guides, so here is a link below explaining how to use one, if needed below:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Tuesday, December 17th, 2019 AT 11:15 PM

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