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This KEY wording here is : "..on a HOT day".
Aux fan is just that....an aux added fan to AID the system with increased air-flow when the sensors detect a "Higher than normal Thermal Load".
A/c is used in winters to aid in clearing windshield of humidity, but you will never see a low fan when it is doing so... b/c you have NO High Thermal Load.
Car travelling down the road at 45 MPH, a/c On , no aux low fan.. b/c it is not needed... NO high thermal load b/c travelling vehicle has plenty of airflow to keep condenser pressure in check. But come to a stop light or slow traffic and On comes fan..b/c of rise in Thermal load and Sensor Demand for more air-flow..
So, the word HOT here is the trick, coupled with low airflow..
Do not expect to see your low fan activated on a cool day just b/c your a/c is ON..it only comes on with Thermal Load Demand .. it is ONLY an aux airflow aid device.. mostly activated at idle, car at rest, hot conditions...and it is actually possible in cooler climates to never come on .
Last edited by Arthur Dalton; 07-12-2007 at 01:02 PM.
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07-12-2007, 11:51 AM
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