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 MANUALSFORD1988AEROSTAR VAN PASSENGER, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMEEC-IV CEC SYSTEMQUICK TESTTEST B5 - ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1988 Ford Aerostar Van Passenger, Automatic
Test B5 - Engine Coolant Temperature (ECT) Sensor
1988 Ford Aerostar Van Passenger, AutomaticSECTION Test B5 - Engine Coolant Temperature (ECT) Sensor
NOTE:
Perform this test when directed to by a Code 21, 51, or 61 during QUICK TEST procedure. For purposes of this test, a "warmed up" engine has a coolant temperature of 50-240°F (10-116°C) for KOEO SELF-TEST and 180-240°F (82-116°C) for ENGINE RUNNING (KOER) SELF-TEST. The test procedure will be invalid outside these ranges.
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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.