The engine cooling fans are not working - could it be the engine coolant temperature sensor ECT or a fuse in your Ford Taurus - Mercury Sable?

Answer 1

If neither one is working at any speed (they have hi and low settings), that would almost rule out a fuse problem.

The engine coolant temperature sensor (ECT) would be my #1 suspect.

Luckily they're not expensive (about $15), and it looks like it is not hard to get at, based on the illustrations in the free online Autozone Repair Guide.

NOTE: The ECT does not feed the dashboard temperature gauge - that's a separate sensor right next door to the ECT.

Where is it?On both the 12 valve Vulcan and 24 valve Duratec DOHC, a rough description of the location: follow the upper radiator hose to the engine. Look for a round, sparkplug-like thing screwed into the cooling hoses/manifolds.

This sensor will have a 2 wire connector - if you see one with only a single wire, that's the temp sensor for the gauge - but you're very close.
From a semi-related question:

The coolant temperature sensor is located directly adjacent to the thermostat housing. The thermostat housing is what the upper radiator hose (toward the right side of the engine compartment) connects to. You do not have to replace the reservoir to replace this part, but leaky coolant reservoirs are a common problem on this model. What about a Fuse?All fuses and relays are in the engine compartment power distribution box

• 1986-1995: #"D"
• 1996-1997: #9
• 1998-1999: #9, 31
• 2000-2003: #9, 24, 32
• 2004-2007: #4, 5, 9, 10,
  - "Fan Relay": #24, 32
• 2008: 7

For diagrams, refer to the model year Owners Manual (See "Related Questions" below)
On 1995 I believe it is inside an electronics box located on the front cross member just above and to the right of the cooling fan. The box is not user-servicable. Normally you have to replace it. On 1999's the box is located between the battery and the fender.
Could be a bad temperature sensor
Usually located at the rear of the radiator about 1/3 down from the top
1995

One of them is located on the driver side of the engine below the air intake hose on the upper heater hose connection next to the engine.