my 1955 cooling fan will not work unless i wire it direct ( PLEASE HELP )

Hi Bowser, It sounds like you have a bad temperature sensor. Without the temperature sensor tells the fan when to turn on and when to turn off. Hope this helps!

i agree with dvigano other than the switchs name its a thermal switch

It could be the temperature sensor,relay, pcm.with a gm scanner youcould check the readings of temp sensor,you can also comand fans on with scanner.if they dont go on with scanner you could have a bad pcm or a open in that circuit

if you are talking 55chevy lei it run.