Re: 1953-54 AC
Posted by HH56 On 2016/11/27 13:28:31
It used predominately recirculated air. The outside vents were connected to return air plenums by a two or three inch duct while the main blower supply was from recirculated air delivered thru large 6 x 9 vent openings and even larger plenums which spanned the top of evaporator box.
Here are a couple of photo of the package shelf and plenums. The shelf photo was posted by Let the ride Decide and the other is from the service manual. On the shelf, the two center oval screened openings are returns while the louvered outside ducts deliver the cold air. The small knobs operate mechanisms similar to the windshield wiper switch to move a cable and operate flapper valves to admit or shut off air from the outside vents. One knob for each side. On the plenum photo, note the return air (and outside air) is admitted to the evaporator top (a plenum is on each end) and is pulled thru the evaporator coil by the blowers and sent out after it is cooled. There is also a thermostat under one of the plenums to measure the incoming air and control the bypass valve accordingly. Unlike other years, the desired temperature was adjustable by the driver.
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Here are a couple of photo of the package shelf and plenums. The shelf photo was posted by Let the ride Decide and the other is from the service manual. On the shelf, the two center oval screened openings are returns while the louvered outside ducts deliver the cold air. The small knobs operate mechanisms similar to the windshield wiper switch to move a cable and operate flapper valves to admit or shut off air from the outside vents. One knob for each side. On the plenum photo, note the return air (and outside air) is admitted to the evaporator top (a plenum is on each end) and is pulled thru the evaporator coil by the blowers and sent out after it is cooled. There is also a thermostat under one of the plenums to measure the incoming air and control the bypass valve accordingly. Unlike other years, the desired temperature was adjustable by the driver.
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