It's a bad connection where the wire plugs into the fan, near the floor on my 13 model. For a possible temp fix, unplug and return about 10 times. Tacoma world has many posts on this common problem.
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5.5qts gets the level midway between the marks, I use 6qts and it fills to top mark. Have the trans cooler and use the larger filter.
I like having more than the minimum amount.
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Carandtruckremotes.com has those instructions, as well as fobs. I used the instructions to delete all as I had a third and gave it away. Then with phone on lap, went through the steps and reprogrammed the 2 I kept. I have a 13 model.
There's a guy on Tacoma World forum sells nice shades, with Toyota truck logo.
https://www.tacomaworld.com/threads/tacoma-sun-shade-toyota-trucks-logo.396790/
If you search tw, you'll find some install a small unifilter on the intake of the fan, keeps large bugs etc from hitting the fan breaking the tiny fins. From what I've read 2012 was the worst with problems, I have a 2013 with no issues. Did install filter.