This almost sounds like the temperature in your Forester has come within 5 degrees of the setting and is going from high fan to low fan. Our does that on days when the sun is beating down and warming the coach up. It runs for a few seconds on low and goes back to high. I usually set the fan from auto to high until the outside temperature starts to go down and that solves the issue.
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2016 Forester 3011DS
2017 Toyota Corolla SE toad
PREVIOUS: 2015 Flagstaff 832IKBS
99 Terry 31G
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