88' 90 5cyl Radiator Fan Problem

["DALE BAXTER, DIR ENROLLMENT MANAGEMENT AND RESEARCH"<BAXTER@PPCC.CCCOES.EDU>]

Need your advice...here'e the symptoms:
  Radiator fan runs whenever the ignition is on
  New thermo switch in the radiator had no effect
  Fan runs even when disconnected from the radiator
  Fan will shut off and come on at high temp if the 1st speed relay is
      out but comes on for about 10 seconds and shuts off
  Goes on and off with the AC switch as it should when the above relay is out
  Switching relays has no effect

Any ideas???

Thanks...
Dale Baxter
88 90
87 5ksq
86 5kcs