As I accumulate the components for an A/C retro fit, I have acted on the heater bypass with quite satisfactory results. Then recently, on a day trip with heat and some highway miles, I was able to fully appreciate the value of the vent window being opened all the way inward to direct cooler air into the cabin, and offer some respite from the heat of the day. No birds or fowl of any kind were otherwise directed into this moving vehicle, some larger insects however were introduced. On the upside, masses of cooler air was channelled into the interior and it really helped. Newer cars may have their "climate control" but we have the luxury of adjustable vent windows! Mike