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 DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANEL - ELECTRONICTESTINGDIAGNOSTIC TESTINGTEST S
1988 Ford Aerostar Van Passenger, Automatic
Test S
1988 Ford Aerostar Van Passenger, AutomaticSECTION Test S
- Ensure cooling cluster operation is okay. Run engine at normal operating temperature. Stop engine. Remove temperature sender wiring connector. Measure and record temperature sender resistance. If resistance is 1200-6000 ohms, go to step 2). If resistance is not between 1200 and 6000 ohms, replace temperature sender and recheck cluster operation.
- Reconnect temperature sender wiring. Turn ignition to "RUN" or "ACC" position. Compare number of bar segments, with engine coolant temperature.TEMPERATURE GAUGE BAR SEGMENTS
Coolant Temp. °F (°C) No. Of Bar Segments Lit 0-120 (-17.8-48.9) 1 120-150 (48.9-65.6) 2 150-180 (65.6-82.2) 3 180-230 (82.2-110.0) 4 230-240 (110.0-115.6) 5 240-250 (115.6-121.1) 6 250-260 (121.1-126.6) 7 260-270 (126.6-132.2) 8 - If display checks okay, system is operating properly. If number of bar segments lit does not correspond with engine temperature, remove EIC. Measure resistance between pin 14C (circuit 397) and 11C. See Figure . Resistance should not vary more than 10 ohms from reading in step 1).
- If resistance varies more than 10 ohms, check for poor connection and/or corrosion at temperature sender or in sender wiring. If resistance does not vary more than 10 ohms from reading in step 1), replace tach/multigauge module and recheck cluster operation.
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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.