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 MANUALSFORD2021MUSTANG ECOBOOST PREMIUM, 2D CONVERTIBLE, 2.3L ENG VIN D, STANDARD TRANSREPAIR AND DIAGNOSISENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE COOLING - 2.3L ECOBOOST (231KW/314PS)/2.3L ECOBOOST (257KW/350PS) - MI4DIAGNOSIS AND TESTINGENGINE COOLINGSYMPTOM CHART
2021 Ford Mustang EcoBoost Premium, 2D Convertible, 2.3L Eng VIN D, Standard Trans
Symptom Chart
2021 Ford Mustang EcoBoost Premium, 2D Convertible, 2.3L Eng VIN D, Standard TransSECTION Symptom Chart
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
| Condition | Possible Sources | Actions |
|---|---|---|
| Loss of coolant | Refer to the Pinpoint Test | GO to Pinpoint Test A |
| The engine overheats. | Refer to the Pinpoint Test | GO to Pinpoint Test B |
| The engine does not reach normal operating temperature. | Refer to the Pinpoint Test | GO to Pinpoint Test C |
| The block heater does not operate correctly. | Block heater power cable Block heater |
CHECK continuity in all 3 power cable circuits. If any circuit measures more than 5 ohms, INSTALL a new power cable. CHECK the resistance of the block heater. If the resistance does not measure between 30 and 40 ohms, INSTALL a new block heater. REFER to: Block Heater . |
| The electric cooling fan is inoperative in one or more speeds or does not operate correctly. | Wiring Relays Fuses Cooling fan motor Cooling fan resistor |
Refer to ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID) . |
| The electric cooling fan stays on all the time. | Wiring Relays |
Refer to ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID) . |
| Noisy electric cooling fan operation. | Foreign material contamination Fan motor |
REMOVE the foreign material from the cooling fan and shroud. TEST the system for normal operation. If still noisy, INSTALL a new cooling fan assembly. REFER to: Cooling Fan Motor and Shroud . |
| Fan blade detached from fan motor | INSTALL a new cooling fan assembly. REFER to: Cooling Fan Motor and Shroud . |
RENDER: 1.0x
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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.