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soo a friends 03 f-150 w/ the 4.6 has noticed the a/c compressor clutch engaging while heater is on. clutch engages for about 3 seconds or soo and kicks back out consistently but only w/ the heater on.
a/c dose function property when using a/c functions...
It is normal for the compressor to cycle when the defroster is on. This allows the vehicle to be dehumidified, to remove moisture from the interior. I suspect your friend is using the defroster, not just the heat.
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