Follow up: posted by doug8867 on May 30, 2024 at 06:17 PM
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I had that happen on my old Acura except the alternator was only about a year old. Crappy reman. Everything would be fine but on a hot day or when I was pushing it a little harder on the highway my radio would start to drop out and pop every so often and the HVAC fan would speed up and slow down. Let it cool off or idle and it was good again. Drove me crazy for a bit until I thought to bring the data link out with me to watch the voltage and it was spiking in waves to 19v. New alternator solved the issue until the car got smooshed in Atlanta traffic.