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I, too have the same issue! No heat whatsoever with any settings. Sucks especially when the outside of the windshield fogs and there’s no heat. It’s going into the service center tomorrow for that and some other issues.
Had the exact issue after glass shop replaced my windshield. Tesla service couldn't figure it out and had to escalate it. I took the car home, checked the rearview mirror and noticed it was a bit lose, plugged it back in and the next day my heater started working again.