Overheating fans shut off when they get to full speed

Good evening.

The fans may be working normally. They do not need to be on all the time. They are only commanded on at a certain temperature and when they lower the temperature, they will turn off.

Does it still overheat?

If you turn on the AC, they should stay on all the times.

Roy

The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure) to determine engine cooling fan needs.

For variable speed electric fan(s):

Edge/MKX, Taurus/Taurus X/Sable, Fusion/Milan/MKZ, Crown Victoria/Grand Marquis, Town Car: FCV Duty Cycle Output From PCM (Negative Duty Cycle)
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The PCM controls the fan speed and operation using a duty cycle output on the fan control variable (FCV) circuit. The fan controller (located at or integral to the engine cooling fan assembly) receives the FCV command and operates the cooling fan at the speed requested (by varying the power applied to the fan motor).

For relay controlled fans:

2.0L Focus (With A/C): PCM FC Output State For Cooling Fan Speeds
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2.3L Escape: PCM FC Output State For Cooling Fan Speeds
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The PCM controls the fan operation through the fan control (FC) (single speed fan applications), low fan control (LFC), medium fan control (MFC), and high fan control (HFC) outputs. Some applications will have the xFC circuit wired-to 2 separate-relays.

For 3-speed fans, although the PCM output circuits are called low, medium, and high fan control (FC), cooling fan speed is controlled by a combination of these outputs. Refer to the table.

Did you reply? I got an email but nothing came through.

Roy