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2021 Corolla Apex SE 6MT
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As Invader said, wind chill (like humidex, in summer) only apply to warm-blooded creatures, not inanimate objects. It’s a more or less successful attempt to elaborate a perception scale. For convenience it’s designed to mimic temperature as it is expressed in numbers but, as many don't notice, not “ ° ” , as it’s rather a number on a scale.
Right, I was just trying to give as much info as possible to help give as much insight into the issue people are having.
 

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I wonder if the coolant reservoir change done in the '21 models have anything to do with it.
323913
 

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I don't believe that reservoir location has much to do with it... There is no circulation until the coolant warms up and thermostat opens... In the sub -15C that we had since January, my HB did take its time to warm up... Thankfully I have heated seats and steering wheel!
 
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So....
Hate to compare a crappy Ford to our Corollas....but I had a very similar issue with a 2016 Escape, now that ya'll bring up the reservoir-thingy.

My work-assigned Escape wouldn't heat up at all unless driven a super long time. Turned out that 1.6EB has a coolant leak issue, and the resevoir is ever so slightly below the heater core. The reservoir showed slightly below "MIN" mark even after vehicle was fully warmed up, so I added water to it. Literally an 8 ounce paper cup worth of water is all it took and the heater began working again.
 

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Mine took around 5 minutes to get to the normal operating temperature at around 22C, driven at 60km/h this morning.
 
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