RPM difference with A/C

Will

New member
Apr 30, 2008
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Mt. Pleasant, IA
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Anyone else notice a difference in the RPMs when the A/C is on compared to when it is off? I've noticed it alot the last couple days now that I have had to use it.

70mph is 2K on the tach except when the A/C is on,then it's about 67-68mph. If I wait til the truck is up to speed and then kick the A/C on I won't notice it til the next time I restart the truck and get back up to cruising speed.