Factory installed Magnadyne 300 watt inverter

Is this what it looks like?

I can't even find this brand online. Likely it's cheap and should be replaced just on general principles.

JAMECOELECTRONICS.COM

Has a ton of different fans. Convert inch measurements to millimeters online. Take the ma milliamp power off the label of the original fan then go for a brushless ball bearing replacement fan. Get a pair of RED butt connectors for the tiny fan wires and pay attention that you don't connect the wires backward and have the fan spin backwards. Simple job. Easy & inexpensive.

just replace the fan
use a computer fan and bolt in or use wire ties
what ever it takes hold it in place

Just pull it out and find a new fan.
Otherwise I recommend Go Power 300 watt sine wave.
Or does it need an ignition cut off circuit for a front tv?

WD40. IF that doesn't work, replace.