Question about 2003 Mercury Grand Marquis

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Okay install new sensor but i forgot to tell you that fan goes not come when you turn on the a/c also

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  • lfjrepairspe May 20, 2011

    where is this cooling fan module lok for it cont found it

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  • Mercury Master
  • 19,396 Answers

Re: "fan goes not come when you turn on the a/c also".

If fan DOES NOT turn on when AC is on. Test the fan motor to see if it is working, If there is voltage to fan and fan does not work, then fan motor is gone. If there is no voltage, replace ECT sensor. Test also the engine cooling fan module. This is not a computer, but simply the an switch/adapter connected to the cooling fan, with connectors for low and high speed.

If fan DOES turns on when AC is on. That happens when the fault is either thermostat or the fan control module (a simple device connected to PCM). This system is computer controlled. When the AC is ON, the PCM will use the input from the AC and this can override ECT sensor.

Replace the ECT sensor first.

Here diagrams :


okay install new sensor  but i forgot to tell you - ginko_160.gif


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Posted on May 20, 2011

  • Ginko
    Ginko May 20, 2011

    The fan control should built in with the fan. I do not have it as separate parts in the 2003 models mounting 4.9 L (302 cu in) 5.0 Windsor V8. The part is shown only in wiring diagram. The fan for 2003 is sold including built in fan controller. Here the fan with fan control. the control is little more than a connector with four plugs.

    Here ECT sensor.

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