Remove the forth HVAC housing-to-chassis nut using a 7/16 socket. The one above the engine was removed in this pic.
Remove The nut holding the plastic drain duct using 7/16 wrench. This is located about 1-foot below the fourth nut and difficult to reach. After removing the drain duct, you will see hidden fifth nut holding HVAC unit (arrow).
The drain duct can be removed by pulling it down.
The drain duct. You can see the hole holding the duct to the fire wall.
Remove the fifth HVAC holding nut using 7/16 wrench. Be patient!
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