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My 2001 lincoln ls is overheating mainly when i turn the a/c on, yes the fan is running an little of the hydraulic was gone, do i need to replace the coolant temp sensor if so laction of it

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With coolant temp sensor check also the water pump, test the hydraulic fan by checking if it changes speed and works under different conditions, check coolant lines and replace fluid, and have the thermostat tested.

If problem comes on only with the AC on, then I do not think that the problem can be the temp sensor. Bleeding coolant liquid is quite complex in this car (the LS has two heater cores and double A/C evaporator core, two coolant control valves, thermostat, radiator, two cooling system air bleeders, cooling system bypass hoses, and an hydraulic cooling fan).
Fluid can be replaced filling cooling fluid first from the tube with an allen key on the cap, located over the thermostat . Fill the reservoir let enfine run ten minutes, then refill both again if needed. You may need to bleed air after this.
Have the job done at the dealer. If that does not fix the problem, then you may have a faulty hydraulic pump or a faulty fan. The fan works using steering fluid and generally runs at higher speed when AC is on or when engine is hot.

Here a forum on the same problem.

Posted on Jul 22, 2010

  • cruels Jul 22, 2010

    i have already change out the thermostat aweek ago, also where in the temp sensor location at. i also hearing the fan changing when i turn the a/c on. Again the hydraulic was low but refill that already.



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