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Having a heater issue and can’t find a solution. Hope someone else has gone down this rabbit hole and can give me some direction.

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Hoping someone’s had this same heater issue as me with my Model S. I can’t figure out what’s wrong

I have a 2017 Tesla Model S 75D and it’s producing no cabin or defrost heat.
Thankfully the heated seats and steering wheel work great or I’d be freezing. But it’s a bit hard to drive with a fogged up windshield.

Here’s what I’ve done so far and I’m hoping someone else might have experienced this same issue/rabbit hole. If you can’t point me in the right direction that would be awesome.

First started by doing a factory screen then car reset. No fix.
Checked the 10v heater fuse. All good.

Then I got a bit more expensive and replaced the PTC heater core, although the one I had didn’t have any issues.

I’ve had the DCDC fuses checked and they have no issues either.

No codes are popping up giving me any errors with the heater or generally any problem.

Got it in service mode from Tesla service and no codes came up this was either.

At this point I’m thinking it might be the HVAC controller, but I’d rather not just keeping buying parts and come up with no solution.

All vents blow air, the A/C does work.

At this point I’m at a loss and hoping for anything.

Thank you