Review on ACDelco 15-71991 – High-Performance Original Equipment Conditioning Solution by Kenny Sarma
Exact Replacement in GM Box:
Original GM in GM Box. It's a self-destructing device, and if you're having fan issues, that's most likely the problem. As soon as the fan stops (this thing fails at low speed), the "cooling" for this thing stops, and then the next position heats up and so on. My old one looks like new. Checked and found defective diodes.
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