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Get cold air rather than heat from vents

Padelford

Member
Supporting Member
Jul 1, 2017
636
618
Seattle
we’ve just driven from Seattle to Ohio along I-90, and we’ve experienced cabin heating problems when the battery is 50% or less. We get no heat from the vents even with the temps set at HI. External temps have been in the 20’s to low 30’s.

Range mode is OFF. Firmware is 2018.12. We don’t have the cold weather package.

However, if the vehicle is charged to 90% or more, we get plenty of heat from the vents with temps set at 70 - 75 deg.

I called the Tesla tech assistance folks, and they didn’t have any idea why this is happening. Is anyone else experiencing this lack of heat problem?
 
Wow, that would be a cold drive. I was going to suggest trying range mode off until I saw you mention it. Just out of curiosity, have you tried restarting the MCU with the ole 2 thumbs salute on the steering wheel?

That’s a good suggestion. I’ve had to reboot the MCU at least once in this trip, but I didn’t notice if that fixed the lack-of-heat problem.
 
And make sure the fan speed is not too high. Too much cold outside air can overwhelm the heating element.

This is not just the rear zone, right? That seems like a known problem.

Otherwise it seems like the battery level dependence needs a trip to the SvC to figure out, if it's repeatable after a reset.
 
And make sure the fan speed is not too high. Too much cold outside air can overwhelm the heating element.

This is not just the rear zone, right? That seems like a known problem.

Otherwise it seems like the battery level dependence needs a trip to the SvC to figure out, if it's repeatable after a reset.

This is the front zone.