CLASSIC AND DREADED HVAC PROBLEMS

[FordMafia]

Hi all I was looking for some help with this issue. Ive read many, many posts and watched a lot of youtube videos and still couldnt figure out a solution.
I'll try to lay the problem out as clearly as possible:
Ive replaced both front (behind the radio, it's not the drivers side one as there is no noise from there) and rear blend door actuators... they still click. I know it's these as I placed my hand on em and ran the ac. I also recalibrated the ac by removing fuses 15 and 46 while car is off for 1 min at least then plug back in and turn on car. Still no luck. I also noticed at this time that the rear vents will blow cold air when the ac is on but will not blow anything if I turn on heat... I tried this by controlling from front and controlling from back.
If anything the knocking sound is louder now because the new motors have all their splines intact lol.
I did take the opportunity to fix the solder on the radio while it was out and at least that went right for me lol.
I'm not sure where to go from here and any advice would be appreciated.
For reference I'm in a 2010 Expedition Eddie Bauer

 

[FordMafia]

Before anyone says to search the forum I have searched all over this specific one and google and couldn't find anything to advise me after doing all the above. So I made an account and here we are.

 

[Lorlainie]

I am having the same issues.

 

[Brons2]

I pulled the negative battery cable when I replaced mine, was disconnected for a number of hours, didn't have a problem when I reconnected.

 

[Fastcar]

I pulled the negative battery cable when I replaced mine, was disconnected for a number of hours, didn't have a problem when I reconnected.

That would be my suggestion as well. These things hold voltage forever. A battery disconnect should be telling imo

 

[FordMafia]

@Fastcar @Brons2 appreciate the suggestions. I'll have some time to try that on Friday or Saturday. Fingers crossed it works.
You think 2 hours should be good? I will definitely update with results unless @Lorlainie beats me to it.

 

[Fastcar]

@Fastcar @Brons2 appreciate the suggestions. I'll have some time to try that on Friday or Saturday. Fingers crossed it works.
You think 2 hours should be good? I will definitely update with results unless @Lorlainie beats me to it.

Yup, it should be enuff.

 

[FordMafia]

@Fastcar @Brons2 @Lorlainie no luck unfortunately. I first did a fuse reset (plugged em back in right after) and then unplugged the battery for maybe 4 or 5 hours and then when I came back I hooked everything up and turned ignition to on position without starting for maybe a min before starting and heard that classic knocking. These are brand new actuators front and back and the front one I sent back and got replaced because I thought it was faulty for knocking. I had all the panels out so I could make sure once again where the noise was coming from and it's definitely these.

 

[Fastcar]

WAG only. Could be a relay telegraphing. The rear blowing cold but no hot is more of a concern to me and points to something more. Gotta get a schematic for this puppy or you'll drive yourself nuts with this.

 

[FordMafia]

Oh it's already starting to drive me nuts lol. I did notice that on the rear controls that are for the back passengers there is a mode setting that's also around the temp setting knob. You can see what I mean on the link I include for a spare control for rear. I never noticed that before so I can't really determine if that's what's happening. But it makes sense in the sense that heat rises, but also no sense bc why wouldn't you want as much hot air as possible when it's cold.

2007-2014 FORD EXPEDITION REAR TEMPERATURE CONTROL SWITCH OEM 259677 | eBay

Find many great new & used options and get the best deals for 2007-2014 FORD EXPEDITION REAR TEMPERATURE CONTROL SWITCH OEM 259677 at the best online prices at eBay! Free shipping for many products!

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[FordMafia]

@Fastcar turns out all my actuators went bad besides front mode which is why I'm still hearing the knocking. I made a new post with a breakdown of all the actuators there are to my knowledge. Might as well get at the mode door in front also before I need it and it doesn't work

 

[GlennSullivan]

I just had all 5 actuators (3 front and 2 rear) replaced on my 2011. The one behind the radio was the second time in 3 years, the other 2 in front I did as a pre-emptive measure. 1 of the rears was starting to make noise, so I did both, again pre-emptive.

 

[Wangle]

I had this problem several years ago on my 2018. The dealer wanted to replace all of the actuators. My profession is a service technician on office machines, so I had a discussion with the service tech. The odds of all of the actuators/blend doors failing at the same time is beyond logic. They replaced one anyway. Problem persisted. I insisted the problem was likely with the HVAC control module. I told them if that wasn’t it then it was likely a short somewhere, and God help us all! That was replaced, and no problems since.

 

[Allen Halstead]

2017 Limited. Had loud clacking from top of dast. Replaced top actuator. Then still clacking from driver side floor. On that one I could reach up & touch it while clacking. Replaced it too. No more noise but air now comes out from correct places but front footwells get cold air with both side temps on Hi. Then battery died. So had battery out overnight. Have tried the “pull fuse(s)” procedure, still no joy. Bought Forscan connecter & full software license. Showed errors so rebooted all 3 actuators. Twice…. Still no heat in footwells. Sigh….
Any suggestions appreciated. Note: Forscan offered reboot but no mention of recalibrate. Not sure if same or not…