Fan periodically running at high rpm on 2006 Ford Explorer

Periodically while driving, the fan will rev at high rpms (almost same speed as my engine rpms as accelerating), but temp is normal. This type of thing usually begins after I come to a stop, then when I accelerate, the fan starts reving high (faster i go, faster fan runs). The first time it happens, car runs really hot to the point my temp light comes on and temp gauge is all the way at the top (in the red)for about 5 seconds. Then runs normal temp after that but fan does rev high (I sound like a jet taking off). Is this my thermostat or something different?

by in Aurora, IL on August 24, 2009
7 answers 1 comment
ANSWER by on September 21, 2009
Hi, Did you find out what was causing this problem? Was the fan bad or the coolant thermostat? Thanks!
ANSWER by on September 23, 2009
I have this same problem , have you found a solution to it yet??? I took it to a tranny shop and everything checked out fine with the Transmission. ...
ANSWER by on October 05, 2009
YES I KNOW WHAT IT IS. I kept wondering what was wrong and it kept getting worse. I finally took it to the dealership and lo and behold the raditor is busted! Radiators are not covered under extended warranties! (Found this out the hard way)So with that said I have to buy a new radiator and a thermostat. GEEZ!
COMMENT by on June 04, 2010
I had this exact same problem that Bernnz pointed out. Took it to the deal, transmission checked out. Then a month later my radiator failed (not covered by warranty, $1200 fix). What I want to know is if the transmission fan problem "caused" the radiator to fail as it caused the car to run really hot.
ANSWER by on June 05, 2010
I had this same problem. My radiator had a small crack so the fan would kick in because the radiator wasn't cooling the motor
ANSWER by on June 18, 2010
I have had the same problem twice in the past 2 years! Replaced my radiator both times. Still revs up real high, temp gauge shoots up, and the fan comes on. However, dealership can't find anything wrong. I'm thinking it's just a Ford thing...?
ANSWER by on June 18, 2010
It was also the radiator here. Figured it out after replacing the fan motor which had gone bad because it was constantly running. I ended up "repairing" it with a bottle of BARS LEAKS and it's held for 9 months so far. I know it's only a temp fix but its been running fine since......Definitely a Ford problem, something with the mounting i believe.
ANSWER by on August 05, 2014
I had this same problem and Apple Valley Ford was able to repair it. Following is the work completed on the service ticket: "Insp under vehicle found the water pump leaking. Coolant low. Suspect the low coolant causing cooling fan to engage and become louder randomly. Replaced water pump assembly. Filled and purged cooling system. Retested. No noises." After completing this work, the fan noises went away - it did not require replacement of the radiator.