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.
2021 BMW M2 Standard TransFACTORY OEM SERVICE PROCEDURE
HVAC testing specifications
64 51 HEATING AND AIR-CONDITIONING UNIT (EVAPORATOR), SWITCHING ELEMENTS SPECIFICATION
| Resistance as a function of temperature | Β°C/kΞ© | -5/11.4... 11.9 0/8.8... 9.2 5/6.8... 7.2 10/5.3... 5.6 15/4.2... 4.5 20/3.3... 3.6 25/2.6... 2.9 30/2.1... 2.3 35/1.7... 1.9 |
64 51 HEATING AND AIR-CONDITIONING UNIT (EXPANSION VALVE), SWITCHING ELEMENTS SPECIFICATION
| Inlet pressure (excess pressure) | bar | 14 |
| Outlet pressure (excess pressure) | bar | 1.8 |
| Leak test with detector at excess pressure | bar | 1... 2 |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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