Re: A/C cycling every 45 seconds = headlight dimming - Saab 9000 Bulletin Board - Saabnet.com
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Re: A/C cycling every 45 seconds = headlight dimming
Posted by BobS (more from BobS) on Sat, 14 Aug 2010 17:00:42
In Reply to: A/C cycling every 45 seconds, rob 94 aero, Sat, 14 Aug 2010 15:58:36
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Under light load the A/C can cycle every 15 seconds, or run consciously under heavy load. Low charge can also cause it cycle less often.
The voltage drop and resulting headlight dimming are caused by energizing the front radiator fan, and to a lesser extent the A/C clutch. The fan DC motor is like a short (< 1 ohm) the instant it is energized, causing a dip in the circuit voltage. As the motor picks up speed, back EMF reduces the current draw.
I can't imagine these cars doing this dimming thing when new, or at least so noticeably. Is larger clutch gaps, worn motors, and deteriorating wiring connections contributing to this dimming dance?
posted by 71.38.2...
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