1954 3100, converted to 12 volt- heater fan was not just wondering if anybody can recognize it before I pull it out to see what is wrong

https://goo.gl/photos/eaKQtVRrR3GuDxux7

https://goo.gl/photos/fmn1TnanR3ZBpwTE7



The fan directly behind the box, picture taken from floor looking up

https://goo.gl/photos/RZsqepkHfM6zPwqy9


1954 Std Cab 3100 w/ 2 spare Engines
IL
1954 three window 3100