Air not blowing from dash vents, only defrost and floor

MDACRUNGE

MEMBER
2011 FORD EXPEDITION
5.4L
V8
4WD
AUTOMATIC
175,000 MILES

New A/C compressor and components were self-installed two years ago, professionally evacuated and recharged.

A/C was working fine last summer until a wire got hot and shorted under the hood and had to be replaced by the dealer.

During the winter the front vents were not blowing any air and was only getting heat and cold from defrost and floor. Rear was working fine, both hot and cold.

Now this summer, all air blows warm (maybe need a recharge as I don't hear the compressor trying to cycle and its less than two years old). Front vents don't work at all, the defrost and floor and rear still blows but not cold.

Not sure if I have a fuse issue, blend door actuator problem or electric control switch. Maybe even a combo of issues. It's my wife's car and she wants A/C, go figure.

Any easy suggestions before I take it in to a dealer for a diagnosis and possible repair?

Monday, July 1st, 2019 AT 1:10 PM

1 Reply

ASEMASTER6371

MECHANIC
52,796 POSTS

Good afternoon,

Do you have a set of gauges to check the high and low side to check the pressures?

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Also, yes, there is an actuator for the dash vents.

https://www.2carpros.com/articles/low-or-no-air-flow-from-vents

Roy

Removal and Installation

NOTE: The defrost/panel/floor mode door actuator can be accessed from underneath the LH side of the instrument panel.

1. Disconnect the defrost/panel/floor door mode door actuator electrical connector.

2. Remove the 2 defrost/panel/floor door mode door actuator screws.

3. Remove the defrost/panel/floor door mode door actuator.

4. NOTICE: The ignition key must be off when replacing the actuator. Energizing the actuator before installation will cause the part to become positioned incorrectly and proper orientation will be lost. Incorrect actuator operation will result.

To install, reverse the removal procedure.

5. NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. To carry out calibration, carry out the following steps.

Remove Smart Junction Box (SJB) fuse 15 for at least one minute.

6. NOTE: When the ignition switch is switched to the ON position, the HVAC module will initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.

Reinstall SJB fuse 15. Turn the ignition switch to the ON position and wait 30 seconds before verifying correct mode door actuator operation.

Image (Click to make bigger)