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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONCLIMATE CONTROL SYSTEMS, SYSTEM SPECIFICFLAP INTERLOCKING
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Flap Interlocking
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Flap Interlocking
Flap interlocking - Graph:
Operation
At coolant temperatures below 53°C (127°F), the solenoid valves which actuate the vacuum plungers are isolated, so that the DEFROST flap position is automatically obtained. At coolant temperatures above 53°C (127°F), the vacuum plunger inhibit circuit is no longer effective, so that the air outlets open in accordance with the preselected program and the position of the control unit lever.
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.