Purty

 

Nice job. It's very gratifying to decode the settings and for some of us that don't have F150s it's the only way to add upgraded components. Now you can feel smug every time you adjust the temperature in your truck.

 

Thanks, Don. Just standing on the shoulders of giants, with a big, smug, sheeit-eating grin on my face.

I took the truck out for an hour this morning. The HVAC module operated flawlessly. I still need to test the PTC heater function. I'll do that this weekend.

 

Don,

Do you buy chance have a shot of the part number label for the module you are using? I bought one that I tried in a previous 2024 F250 7.3 Platinum, it did not work after writing back the asbuilts. I knew there was probably more programming it needed, but traded the truck off for a 2024 F350 6.7 HO. Before I try it again in the new truck I would be curious if there are any known limitation in the model of the HVAC control I have. Here is mine now:

 

@RayoVac Not Don here, but I think I might have the answers you're looking for.

The part number on the back of the module I'm using is ML3T-18C612-DF, which I believe means it is one revision newer than yours, but the same actual part. Going off the photo you provided, it appears you have the module with heated steering wheel button, heated seat buttons, cooled seat buttons, and a rear defrost button. If you have the LCD readouts in the ***** you have the same module as I: ML3Z-19980-K (Ford's P/N).

No known limitations as of yet, but so far as I can tell, I'm the first one to successfully pull off this swap into a Super Duty... at least the first who has posted about it anywhere. My big post a couple posts back gives all the details of what I did to program it. I know it's a long read, but it's worth it (I think).

-Dustin

 

Damn, sorry, I thought you were Dan... duh. I read the whole post... and have also poured over Livinitups master sheet, but I was not chasing down the HVAC controls, I was after Trying to figure out WalkAway Lock at the time. I for one am very appreciative of all your effort this, glad I did not toss my module. And yes, it has the same exact buttons and layout as my 2024 Platinum has, just with the LCD in the ***** which is of course why we all want this to work

 

No worries... Don was giving me a lot of encouragement and I mentioned him quite a few times... I got confused at one point too, and accidentally PM'd Don when I meant to PM the OP.

I didn't realize we could program Walk Away lock on these trucks. I wouldn't do it, myself. We have it on my wife's Mach-E and it drives me nuts because I can never just walk to the garage without my phone/key and open the car door. And yes I know we can disable it... she just won't let me.

 

I had the walk away and for that matter walk up, lock/unlock on a BMW I had before the truck. I really like that feature. So I enabled Walk Away lock, works great. You just can't mess with the setting in the locks page in the truck or it messes it up. Now if walk-up unlock worked, that would be perfect, but I still have to touch the handle.

 

Tested this morning and can confirm (EDIT: I THINK) the Rapid Heat Supplemental Cab Heater (PCT supplemental heater) is working with this module.

I don't see any reason to go back to the stock module at this point, except for warranty purposes. It'll live on the shelf as a spare.

EDIT: Additional info in following post.

 

Since I made my post earlier, and had some coffee, the following has bothered me more and more.

During my test, the PTC relays PIDs in BCMC (left) and HVAC (right) never showed as turning "ON" in FORScan:



I never tested these PIDs with the stock module HVAC installed, so I don't know for a fact that FORScan reads them correctly. That said, this morning during my test, I was getting temperatures at the vents a good 20-25 degrees warmer than the engine coolant temp (and it was probably even warmer, because I was using an IR thermometer which doesn't do well reading air temp). This is how I decided that the electric cab heater was indeed working.
....Is this enough to claim the Rapid Heat electric heater is working? What do you guys think???

For my OCD's sake... has anyone here ever monitored these PIDs during supplemental heater operation on a 2023+ truck with the stock HVAC module and confirmed they actually come "ON" when the supplemental cab heater is operating?

 

Do the same test using the graphing function (oscilloscope icon). Maybe you are missing a change of state. My electric heat is noticeable on very cold says because heat is produced within one minute of start up. If you get this result then you have what you need...fast heat.

 

Thanks, Don. Will do... I had wondered about that, but just assumed the relay would show "ON" if they were on. But if they are latching relays, the change of state like you said may be too quick to see on the dashboard. I did also notice the other day when playing around with it, that oftentimes things like button presses do not show at all on the dashboard... only the oscilloscope. So I guess what I'm trying to say is, "great idea, why didn't I think of that?"

I hope to have some more concrete answers by the end of this week... We're looking at a nice drop in low temperatures here in 2-3 days... should give me much better testing conditions than what I had this morning.

 

This project, occupying my every waking thought the last ten days, stirred a half-crazy idea in my mind about an hour ago: What if I could make the truck think it's cold outside?


Ah, yes... the old "bag of ice cubes zip-tied to the outside air temperature sensor" trick.

Back in the truck, it's now a simulated, slightly-frosty 27F outside, with my handy-dandy meat thermometer registering a comfortable 69F in the vents:


Connect FORScan, go to the PID oscilloscope screen, start the truck, and set the HVAC to 'HI', dash vent output, fan speed 2, and wait a few seconds...

One by one, the PTC relays in the BCMC module switch from OFF to..... OFF? Funny labeling, there, FORScan. I guess that's why I didn't see anything the other day. Good call, @Don Ridley !

Most importantly, though, onward comes the beautiful, electrically-heated air:

It just kept getting warmer and warmer, and my last reading was 105F with engine coolant temp at 80F.

I turned the HVAC control down to 'LO', waited a bit, then back to 'HI.' The PCT heater relays switch off, then back on, one by one:


The other PTC readouts, PTC_HEAT_RL#1, #2, and #3, shown in my screenshot in post #40, never gave me any readings. This makes sense as they are HVAC module readouts, but the HVAC module on our trucks doesn't contain the PTC relays... the BCMC module does (source: Service Manual).

Anyhow, I'm completely happy with these results and am calling this mod a success.

If anyone else out there is looking to add temperature-readout LCD ***** to your 2023+ Super Duty, feel free to PM me... I'm happy to help you through it.

And to the OP, @ngiovas , sorry to have so thoroughly hijacked your thread, but I think the answers we both were looking for are here, now.

 

Actually, thanks for hijacking my thread! I learned a lot from it. Your work will be a huge help to the super duty community.

Nick

 

@dspa So after all this, are the AsBuilt changes (and attached TXT) you shared in post #29 for your 23-24, all we need to do? Or did you find other line items that need modification. I understand there is no correlation or sense made of the plain english settings, and messing with those will only break things. But given I have a 24 Platinum 6.7 with Supplemental Heater, I would assume my needed changes should be the same as what you have done. Does that sound about right?