Should I start my air conditioning w/re-circulating air then switch to fresh air after car gets cool?
No, it is always best to use the outside air at first, this removes the stale air that present inside the vehicle and also removes any hydrocarbons that tend to build up in a hot car, then if the air from the vent is still not cold enough you can switch to recirculating the internal air as it cools. I always leave my system on fresh air, in my area it just does not get really hot enough outside to warrant using recirculating air.
Thanks. Problem is in my area it sometimes gets very hot & I need to cool things down as quickly as possible. But I never thought about the hydrocarbons. I guess it's a judgement call.
Then think of it this way, outside air is usually cooler than inside air on a hot day even if it is 120 degrees, so it make sense to pull in the cooler air at start up to flush out the hot as fast as possible.
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