There is also fan speed to consider - Saab 9000 Bulletin Board - Saabnet.com
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There is also fan speed to consider
Posted by Kappy (more from Kappy) on Tue, 12 Aug 2003 21:36:06
In Reply to: Re: A/C cooldown time, Kappy, Tue, 12 Aug 2003 21:28:02
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The harder the blower motor is going, the more air that is getting pulled across the evaporator which reduces the cooling for the air by volume. This means that when the blower motor is going at full speed, the vent temp will be higher than when the blower motor drops to it's lowest speed.
After you have been driving for an hour, much of the heat will have been sucked out and this reduces the cooling demand on the AC system. Consequently, the ACC slows the blower motor down and you see a lower vent temp. In this way, you can sometimes get a lower vent temp with the ACC set to 72 than set to 62.
posted by 24.50.58...
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