A/C and heater are not working in the front?

Tiny
JESUS J CORENA
  • MEMBER
  • 2010 LINCOLN NAVIGATOR
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
My wife's car recently lost its A/C in the front as well as heating. The back works perfectly fine. I checked fuses and relays all seem to be ok. She does remember a slight knocking noise a few weeks back. I replaced the HVAC A/C Heater Blend Door Actuator (the one right behind the stereo lol) and still no luck. Any advice as to what steps to go through next?

Not sure if it has anything to do with this, but I know triple A recently replaced the car battery and within a month or so the brake lights, ABS, and the advantrac started to flash here and there very minimal. Now those lights are just solid. I went to AutoZone and they ran that check light device and they said there's no codes, to check my battery.
Wednesday, August 23rd, 2023 AT 6:04 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
You might want to try resetting the system, this guide can help:

https://www.2carpros.com/articles/step-by-step-guide-to-reset-your-cars-hvac-system-an-essential-for-every

If this doesn't work here is the location of the mode blend door actuator which sounds bad, it has installation instructions as well. Check out the images (below). Please let us know how it goes.
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Thursday, August 24th, 2023 AT 11:33 AM

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