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.
Notes for service technicians: Guard
If the temperature of the coolant or of the engine oil becomes excessive during engine operation, certain functions in the vehicle are influenced in such a way that the engine cooling has more energy available.
The measures are divided into 2 operating modes:
- Guard
- Coolant temperature between 117 °C and 124 °C
- Engine oil temperature between 150 °C and 157 °C.
Measure: power reduction of the climate control (up to 100 %) and of the engine.
- Emergency
- Coolant temperature between 125 °C and 129 °C
- Engine oil temperature between 158 °C and 163 °C.
Measure: power reduction of the engine (up to approx. 90%).
NO RELATED
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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.