If I’m correct, you remove the panel on the left side of the drivers footwell, there is a little flap with a T20 screw behind it. Ones that panel has been removed, you should be able to see the motor about 6” up. It’s either held in by simple clips or by a 6/7mm screw.
I’m having a similar issue where my temp is only going to about 20 degrees and won’t go hotter. I’ve changed all the flap motors and flushed the heater core but no luck for me yet.
Hopefully a new motor fixes your issue
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