Fan switch glowing red??

[agnes the dog]

Hi, hope you aren't getting tired of these questions, but this one is concerning. I leaned into my truck today at just the right angle to see that the switch that controls the heater fan speed was glowing red at the back (inside the dash). It only did this on the middle speeds - not high or off. It looked like an old electric heater element. To me, it looked very hot. I didn't leave it on long enough to find out. I assume that this is not right. Anyone ever see this before?
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