Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1990COUGAR/XR7 V6-232 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
1990 Mercury Cougar/XR7 V6-232 3.8L
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
1990 Mercury Cougar/XR7 V6-232 3.8LSECTION Description and Operation
Fig. 4 Engine coolant temperature sensor:
The ECT, Fig. 8, sensor detects the temperature of engine coolant and supplies information to the ECA assembly. The ECT sensor is threaded into the heater outlet fitting on the engine. For engine control applications, the ECT signal is used to modify ignition timing, EGR flow and air/fuel mixture. On models with an electronic instrument cluster, the ECT output is used to control the coolant temperature indicator.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.