Early OEM Front Heater Difference? (1 Viewer)

Drake2

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Oct 11, 2017
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Wisconsin
I have a few early front heaters and noticed a difference in the heat output opening. One opening is wide open and the other has a grid or air separator. Was there a specific application for either one? Maybe one is earlier than the other?

20210404_230845.jpg
 

tahoe40/45

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Aug 20, 2007
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1,123
Location
N. California
I had two FJ45 LV's ( 66 and 67) with the heater with the reverse louvers and the four way separators. My FJ45 LWB ( 65) has the regular louvers and the non separated opening.

Maybe just a upgrade to heater boxes on newer models???
 

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