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How do you disconnect aux heater and ac unit on 1990 ford e-150van?
Slaterock69
There are valves for both the hot water lines and the AC lines to disconnect it from the main system.
Go under the vehicle, on the drivers side, and trace the lines from the heater-ac unit, to the shut off valves.
Close all valves completely ( turn them the opposite way ), then the rear system is inoperative.
Now you can remove the unit or leave it inoperative.
If you want the aux fan to be inoperative, you must disconnect that wire, which should be at the Aux unit.
Tape the end of the connector to prevent it from shorting out. Joedi
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∙ 16y ago
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