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My main A/C vibrated like a SOB. They investigated and snugged up the 4 bolts.
Take inside cover off (whole thing, not just filter access) and check/torque down the bolts. I was amazed how just a tiny bit loose and it vibrated that much. Just a tweak and it was good to go.
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Eddy
2019 GMC Sierra 2500HD 6.0L
2020 Cougar 32BHS
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