Car has 2 fans ,passenger side just replaced. replaced ac pump w/ pulley. 1999 ford taurus fans do not come on is this because temp gauge does not register
To find out about the CTS (the sensor the above clarification request is referring to), try disconnecting the wiring harness. It's right behind the thermostat housing and upper radiator hose. If your fans kick on while the engine is running, it's probably an issue with your PCM (computer).
I've been having a similar problem with my 1999 Taurus (OHV). Try checking the wiring harness for voltage. You should have five volts on one side (connect the negative terminal of your voltmeter to a good ground and test the terminals with the positive lead). The gray/red wire should have five volts, the light green/red wire should carry nearly nothing. You can also check the terminals on the sensor itself with an Ohm-meter. It should be around 14.000 ohms when cold, then the resistance (ohms) should go down as the engine warms. Hope this helps you to whittle down where the issue is.
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Have you tried replacing the temperature sending unit? I think it's close to the air filter assembly. It has two wires going to it and two posts that are threaded into a smaller box. Hope this helps.
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