Question about Mercury Cougar

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My low coolant light stays on although water level is okay. I have a 1997 Mercury Cougar.

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  • Master
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Hi the problem you are having is with the low level sensor this is located in the coolant filler cap and all you need to do is get this replaced, they are not expensive to buy and it will solve your problem.

first check the wires are not loose or shorting give them a good wiggle and see if the warning light goes off also get someone to press the switch by hand and see if that turns the light off or not.

let me know if you need further assistance ok

plz rate this solution as i have a whole page of unrated posts, thanks

Posted on Sep 15, 2010

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  • Mercury Master
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Need to replace the coolant sensor.

Removal & Installation

  1. Drain the engine cooling system slightly.
  2. Disconnect the negative battery cable.
  3. Detach the wiring connection from the sensor.
  4. Remove the coolant temperature sensor from the intake manifold.
  5. Clean the sensor area of any debris.

To install:

  1. Install a new sensor into the intake manifold. Tighten the 6-14 ft. lbs. (8-19 Nm).
  2. Attach the sensor wiring to the unit.
  3. Connect the negative battery cable.
  4. Fill the engine cooling system with a 50/50 coolant water mixture.
  5. Start the engine and top off the cooling system.

Removal & Installation

The coolant temperature sending unit is located on the, left side rear of the head on inline engines, and on the front of the intake manifold on V6 and V8 engines. Disconnect the sensor wire and unscrew the sending unit, quickly thread the new unit into place (this will cause very little coolant fluid loss) tighten until the fluid stops leaking; to about 6-10 ft. lbs. (8-14 Nm). Connect the sensor wire and check for normal operation.

Posted on Sep 15, 2010

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Posted on Jan 02, 2017

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