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 MANUALSACURA19983.5RL SPECIAL EDITIONREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 16 (A/C-HEATER SYSTEM)TESTINGENGINE COOLANT TEMPERATURE (ECT) SENSOR
1998 Acura 3.5RL Special Edition
Engine Coolant Temperature (ECT) Sensor
1998 Acura 3.5RL Special EditionSECTION Engine Coolant Temperature (ECT) Sensor
WARNING: This page is about a different car, the 1998 Acura 2.5TL. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Remove climate control unit and disconnect 20-pin connector. Disconnect ECT sensor connector. Check for continuity in Red/White wire between climate control unit connector and ECT sensor connector. If continuity does not exist, repair open Red/White wire between climate control unit and ECT sensor.
- If continuity exists, check for loose wires or poor connections at climate control unit 20-pin connector and ECT sensor connector. If connections are okay, substitute known-good climate control unit and recheck. If symptom goes away with known-good climate control unit, replace original climate control unit.
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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.