Question about 1999 Ford Taurus

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Cooling fans only run when gear is in park

The cooling fans are only running if parking gear is selected in the steering column shifter. While driving, they never turn on, but pull into a space, park the car, pop the hood and go out to check, they turn on. What could this be? I've replaced the pigtail and sensor, and the fans turn on now, but only while in park. Please help, this is killing me. The engine is obviously getting too hot because the coolant begins to steam before it overflows from underneath the radiator cap. The first time this happened, I came back back from the store and saw the pubble under the car, checked the cap, and it was loose. Just got home, and the cap is tight, but the coolant rises rapidly and starts to spill from under the radiator cap with steam escaping along the sides. Have recently noticed a small pool of coolant on the lower corner lip of the expansion (recovery) tank with a trail of coolant running around the edge that seperates the upermost black portion from the lower black portion. Any help would be greatly appreciated.

Engine info: 3.0L V6 Vulcan 12 OHV

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  • Joseph Weisenberger
    Joseph Weisenberger Jun 27, 2009

    Radiator cap is only three weeks old

  • carl May 11, 2010

    wow I would have to check the wiring diagrams on that might be a bad ground but I know this might sound crazy try putting a new radiator cap on it

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  • Ford Master
  • 14,027 Answers

Looking at a wiring diagram I see two relay's that control the cooling fans (has two ) High speed cooling fan relay , low speed cooling fan relay . Both relays are controlled by the PCM - engine computer . Your best bet , have it checked for DTC'S - diagnostic trouble codes . Could have control circuit problems .There are videos on youtube test relay controlled circuits . How to test at the relay base (where relay plugs into ) Test power an grounds an control . Do you know how the cooling fans work ? Coolant temp. sensor inputs temp to PCM . When coolant temp reach's 200 to 220 , the PCM will energize the relay's low speed then high if temp fails to come down . Can check this data on a good scan tool . Can even turn the fans on with a good scan tool .

Posted on Mar 05, 2017

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Posted on Jan 02, 2017

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roniecon
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SOURCE: Car running hot, fans operate only in park

also check for ground to engine to body/////

Posted on Jun 29, 2009

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