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 MANUALSBMW2004320I (E46) (CANADA) L6-2.2L M54REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONTEMPERATURE CONTROLMICROSWITCH, COLD SETTING (HEATER CONTROL)
2004 BMW 320i (E46) (CANADA) L6-2.2L M54
Microswitch, Cold Setting (Heater Control)
2004 BMW 320i (E46) (CANADA) L6-2.2L M54SECTION Microswitch, Cold Setting (Heater Control)
Temperature Control
Temperature control
The temperature of the heating controls is regulated exclusively by a mechanical mixing flap. This flap allows the through-flowing air (depending on the flap angle) to flow through the heat exchanger or past it.
6-cylinder models only:
If the rotary switch for the setpoint temperature is set to max. COLD, a microswitch switches on the water valve thus keeping the water circuit closed. The heat exchanger is then completely separated from the cooling circuit.
Diesel models only:
In the event of a high heat requirement, the auxiliary heater is activated by means of a microswitch in the recirculated-air/rear-window defroster double switch.
RENDER: 1.0x
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.