Not the greatest design.
A worn blower motor drawing excessive current will also cause issues!
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Blower resistor & harness: https://amzn.to/3VaH3Lm
Blower motor: https://amzn.to/3Vrsany
Chapters:
0:00 Intro
1:42 Old unit temps
4:44 Replacement
11:08 New unit temps