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Air Conditioning/Heater on 2002 Ford Ranger

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When at idle, either parked are at a stop, AC/Heater seems to cause excessive drag on engine. Not really noticable while driving. Air/heat still seems to work fine otherwise. Could this be my compressor seizing up/failing?
(1) Answer
Your AC will drag on your engine especially at idle. How much is too much - hard to say. A good inspection - visual and observing the operation is a good idea. Something as simple as a throttle body cleaning or replacing an idle air control valve to control idle better may be necessary.