It’s already 97* in Phoenix today and I was sweating on just a short drive. I have the Vintage Air heater with Ball vents pointed towards the seats. Even with turning the vents off, it was still pushing air through. I found the duct inside the engine bay didn't have a door and allows the squirrel cage to run with the engine heat passing through.

So I made a 3-D printed cover to block off the opening. Hopefully this will work for a few weeks while I find a vynil cover from work that snaps on and off easier.

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