It should run from the heater housing assembly up to the dash vent. As far as your 4wd light........ I have an 87 that I've had about a year now and the light never has worked. I have checked the bulb, the connections, and the wiring and all I can figure out is that its the vacuum operated switch located below the battery tray. The only place to get it is at the dealer, so I gave up. Never even checked on a price for it.
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