If you have A/C then the temperature flap isn't cable-controlled.
I had a similar fault on a Polo which I traced to the V68 temperature flap control motor, which is mounted on the passenger side of the blower box. The motor and/or the potentiometer were sticky, and so it would intermittently blow very hot air.
It's a bit tricky to get to but can be replaced without removing the dash if you have nimble enough fingers and a bit of patience! The part was about £80 from a main dealer.
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