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 MANUALSBMW2009M3 4D SEDAN, AUTOMATIC DCTREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE MANAGEMENT SYSTEM -- OVERVIEWCOOLING SYSTEM
2009 BMW M3 4D Sedan, Automatic DCT
Cooling System Circuit Diagram
2009 BMW M3 4D Sedan, Automatic DCTSECTION Cooling System
INDEX EXPLANATION REFERENCE CHART
| Index | Explanation |
|---|---|
| 1 | Electric fan (850 W) |
| 2 | Coolant level switch |
| 3 | Coolant temperature sensor |
| 4 | Control valve in the air conditioning |
| 5 | Coolant pressure sensor |
| 6 | MSS60 Engine control system |
| 7 | Junction box |
| 8 | Electric fan relay |
| 9 | High-current circuit breakers |
| 10 | IHKA |
| 11 | Instrument cluster |
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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.