01-25-2017, 07:06 PM
I would guess that you will find the engine heat core in that box. Is there engine coolant hoses hooked up to it? My '93 has an air inlet for the dash hvac in the floor near the passenger seat. The air goes in there and then circulates through the engine A/C evaporator, then through the heater core , then through those 3" air hoses to the dash vents.
1993 Newell (316) 45' 8V92,towing an Imperial open trailer or RnR custom built enclosed trailer. FMCA#232958 '67 Airstream Overlander 27' '67GTO,'76TransAm,'52Chevy panel, 2000 Corvette "Lingenfelter"modified, '23 Grand Cherokee.