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 MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONENGINE CONTROL SYSTEM OUTPUTSELECTRICALLY HEATED THERMOSTAT CONTROL
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Electrically Heated Thermostat Control
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Electrically Heated Thermostat Control
M62 engine equipped E38 and E39 vehicles utilize an electrically heated thermostat to raise the engine's operating temperature in the part load operating range to improve fuel economy.
Control of the heated thermostat is an output function of the M5.2 module. The map controlled thermostat operates under the following parameters:
- Engine load
- Engine speed
- Vehicle speed
- Coolant temperature
- Intake air temperature
During part load running, the operating temperature of the engine is raised to approximately 110 °C, based on all operating parameters.
When operating at higher loads the thermostat heater is switched ON. The added heat of the element causes the thermostat to open earlier than it would have from the water temperature alone.
The heater is also switched on with excessive temperatures (> 113 °C).
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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.