Quote:
Originally Posted by Jamesp
Warm the car up and pull the plastic battery cover in the Frunk - check the two rubber lines behind the battery - if both good and hot then heater core functioning. If not bleed the air out of the cooling system.
If both hot, a mechanical failure in the mixing valve / door is likely.
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It most likely depends on bad mixing valves. Find the exchanger valve (hot/cold) and check if it moves as long as you increase/decrease temperature. If the valve's arm moves smoothly but no warm/hot air comes out from the grids, take it down and replace it. You can even try to repair it if you have will and skill.