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 MANUALSFORD2018TRANSIT-150 XLT, 3.5L ENG VIN GREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE COOLING - 3.5L ECOBOOST (235KW/320PS)DIAGNOSIS AND TESTINGENGINE COOLINGSYMPTOM CHART
2018 Ford Transit-150 XLT, 3.5L Eng VIN G
Symptom Chart
2018 Ford Transit-150 XLT, 3.5L Eng VIN GSECTION 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 - Symptom Charts (Except Diesel & Hybrid) |
| The electric cooling fan stays on all the time. | Wiring Relays |
Refer to Engine Controls - Symptom Charts (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.