It is definitely the A/C compressor, also called a "blower", I am 95% sure. It is supposed to do that whenever its need for either cool air (A/C) or to remove moisture from the air.
I will see if mine comes on for main vents + legs tomorrow when I drive it to my realtor's office to look at more houses, and get back to you.
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5.9L 360ci Magnum V8
Single 3" Flowmaster Super 44 Exhaust w/ Magnaflow Catalytic Converter
Volant Cold Air Intake Kit
Fastman 52mm Throttle Body
Modified Intake Manifold w/ Hughes Plenum Reinforcement Kit
SCT XCalibrator 2 Tuning by Hemifever
Awaiting Install: 3.92 gearing all around & Auburn LSD in rear axle
