The fan on my right GRT HXr EFIS has been making a racket on startup for years. GRT says that the fan is a Sunon MC25101V2-000U-A99. That fan is no longer manufactured, but I found the MF25101V2-1000U-A99 which is. Turns out it moves a bit more air and uses a bit less current than the one it replaced. So, win-win!
Removal of the EFIS for surgery.
The fan is not designed to be field replaced. You need to take apart the back of the EFIS to access the fan.
And its wires are soldered on the reverse side of a circuit board.
Rather than trying to fuss with desoldering those wires, I just cut them
and spliced in the new fan with a few layers of heat shrink tubing for
additional insulation.
Then the wires are tucked back in and the EFIS is reassembled.
Success.
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