when I was a Volvo dealer we had a problem with an electric fan once....Volvos use electrics...customer comes in ,saying that thge car suddenly overheats...the car would over heat pretty quick too..very unusual...and it got hotter and hotter...

we were stading around it , the mechanic ,the service mgr and I, checking the engine running..see the temps going up, checked with a heat gun...until I felt something...stuck my hand down in front of the radiator...the fan was blowing the wrong way!!
someone had worked on it at another shop, plugged in the wires wrong so instead of pulling cool air in, it was blowing hot air from the engine out thru the radiator...LOL