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i've already started removing my broken ac.
i've got the lines off and the compressor unhooked. there is a large black box mounted to the firewall on passenger side, if i remove that will it effect the operation of my heater?
Yes, the black box on the passenger's side of your firewall contains the heater core and AC evaporator. If you remove everything you'll no longer have a heater core.
I would say yes just seal there the evap coil lines come out so air only goes inside the truck.
I think DaveF said the 87-92? trucks with out AC will have a box you can use to replace yours.
Thing is your firewall has 3 larger holes and non AC trucks only have 2.
Some of the smaller holes are moved also but they are not a big deal they say.
The newer trucks the fire walls are all AC and the box changes to make it non AC and why it will bolt to your fire wall.
No I have not dont this just going by what I seen posted.
Me I wanted AC in my non AC truck so I graphed in half of the AC fire wall into my truck for factory AC.
non AC
Dave ----
That big black box (under the hood) houses the AC evaporator and is also the duct between the fan and heater core. On factory AC trucks, the heater core is inside the cab. If you were to remove that box, all airflow from the fan would simply dump under the hood and never reach the heater core or cab.
You could safely remove the evaporator from inside the box but it might not gain much for you. The evaporator face typically collects debris that eventually forms a hard mud and restricts airflow. (All airflow passes through the evaporator even if the AC is off or not working.)
The case is easy enough to open. Undo the fasteners around the perimeter. One fastener passes through the firewall and is accessed from inside the cab, above the passenger’s feet. With the case open and lines removed, the evaporator pops out. You’d have to plug the holes for the lines.
so on an old *** truck like mine, i may improve heater and defrost flow by removing the box, taking out the evaporator core and simply using the box as a duct line for the blower motor
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