I'd pull the radiator fan relay, use a testlite on the circuits. One voltage terminal is battery voltage, hot all the time. There may be a second hot terminal, that is relay control voltage comes from the pcm. That circuit shouldn't be hot unless there is a fan request.
Check the coolant temp sensor. Have the trouble-codes checked, some of the national brand autostores will check codes for free.
Wednesday, December 2nd, 2009 AT 9:22 AM