98' Coolant fans not working??

I have a 98 transport and for some reasone my coolant fan's are not working at all..

what Ive done...

.. replaced relays in fuse box under hood
.. checked all fuses under hood that pertain to the cool fan
.. replaced thermostate
.. replaced the censore on the thermostate housing (guessin its a temp sensor)
.. replaced the air sensor on the intake before the fuel body (small round sensor)

and Im still stumped.. I have since ran a wire from the fan to a switch inside that I temporarly mounted on the side of the dash.. buts it needs to be fixed

any help would be greatly appreciated..

thanks in advance!

Remember they only come on based on engine temp of approximately 222 degrees F, or by the ac high side pressures.

Remember they only come on based on engine temp of approximately 222 degrees F

or higher!!!

yeah Ive let it warm up so much that it started to boil over....
and still nothing..

any other switches or sensors Im missing?

what would you do next? shop?

Are you shure you replaced the right relay for the fan,and didn't get it
mixed up with another relay??