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 CONDITIONINGTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWAIR DISTRIBUTION PROGRAMS
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Air Distribution Programs
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Air Distribution Programs
Air distribution program AIR CONDITIONING FULLY OPEN
Position of Control Unit Lever Flap Functions
0 - 100% Compressor on
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 8% Recirculating air flaps open
0 - 100% Footwell flap open
0 - 8% Fresh air flaps closed
0 - 22% Defroster flaps closed
0 - 100% Ventilation flaps open
Air distribution program AUTOMATIC AIR CONDITIONING
Position of Control Unit Lever Flap Functions
0 - 100% Compressor on
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 8% Recirculating air flaps open
40 - 100% Footwell flap open
0 - 8% Fresh air flaps closed
22 - 46% Defroster flaps half-open
46 - 100% Defroster flaps fully open
0 - 46% Ventilation flaps fully open
46 - 80% Ventilation flaps half-open
80 - 100% Ventilation flaps closed
Air distribution program AUTOMATIC HEATING
Position of Control Unit Lever Flap Functions
0 - 100% Compressor off
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 100% Recirculating air flaps closed
0 - 100% Footwell flap open
0 - 80% Defroster flaps half-open
80 - 100% Defroster flaps fully open
0 - 100% Ventilation flaps closed
Air distribution program HEATING UP/DOWN
Set airflow selector wheel to ( [] [] [] ).
Press program preselector button for HEATING UP/DOWN.
Run engine at idle speed (must be at normal operating temperature).
Position of Control Unit Lever Flap Functions
0 - 100% Compressor off
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 100% Recirculating air flaps closed
0 - 100% Footwell flap open
0 - 80% Defroster flap half-open
80 - 100% Defroster flaps fully open
0 - 100% Ventilation flaps closed
Air distribution program RECIRCULATING AIR
Position of Control Unit Lever Flap Functions
0 - 100% Compressor control on
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 100% Recirculating air flaps open
0 - 100% Fresh air flaps closed
22 - 46% Defroster flaps half-open
46 - 100% Defroster flaps fully open
0 - 46% Ventilation flaps fully open
46 - 80% Ventilation flaps half-open
80 - 100% Ventilation flaps closed
Air distribution program REAR SEAT AREA
The rear seat area outlets can be opened and closed manually, independently of the various programs (apart from DEFROST).
Air distribution program DEFROST
When the DEFROST program is preselected, the control unit must adjust automatically to 100% heat output.
- If there is a malfunction, check the linked sensor circuit. If this is in proper working order, renew the program switch or the control unit.
Position of Control Unit Lever Flap Functions
0 - 100% Compressor on
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 8% Recirculating air flaps open
0 - 100% Footwell flap open
0 - 8% Fresh air flaps closed
0 - 22% Defroster flaps closed
0 - 100% Ventilation flaps open
Air distribution program AUTOMATIC AIR CONDITIONING
Position of Control Unit Lever Flap Functions
0 - 100% Compressor on
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 8% Recirculating air flaps open
40 - 100% Footwell flap open
0 - 8% Fresh air flaps closed
22 - 46% Defroster flaps half-open
46 - 100% Defroster flaps fully open
0 - 46% Ventilation flaps fully open
46 - 80% Ventilation flaps half-open
80 - 100% Ventilation flaps closed
Air distribution program AUTOMATIC HEATING
Position of Control Unit Lever Flap Functions
0 - 100% Compressor off
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 100% Recirculating air flaps closed
0 - 100% Footwell flap open
0 - 80% Defroster flaps half-open
80 - 100% Defroster flaps fully open
0 - 100% Ventilation flaps closed
Air distribution program HEATING UP/DOWN
Set airflow selector wheel to ( [] [] [] ).
Press program preselector button for HEATING UP/DOWN.
Run engine at idle speed (must be at normal operating temperature).
Position of Control Unit Lever Flap Functions
0 - 100% Compressor off
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 100% Recirculating air flaps closed
0 - 100% Footwell flap open
0 - 80% Defroster flap half-open
80 - 100% Defroster flaps fully open
0 - 100% Ventilation flaps closed
Air distribution program RECIRCULATING AIR
Position of Control Unit Lever Flap Functions
0 - 100% Compressor control on
0 - 66% Cold-start interlock off
18 - 100% Water valve open
0 - 100% Recirculating air flaps open
0 - 100% Fresh air flaps closed
22 - 46% Defroster flaps half-open
46 - 100% Defroster flaps fully open
0 - 46% Ventilation flaps fully open
46 - 80% Ventilation flaps half-open
80 - 100% Ventilation flaps closed
Air distribution program REAR SEAT AREA
The rear seat area outlets can be opened and closed manually, independently of the various programs (apart from DEFROST).
Air distribution program DEFROST
When the DEFROST program is preselected, the control unit must adjust automatically to 100% heat output.
- If there is a malfunction, check the linked sensor circuit. If this is in proper working order, renew the program switch or the control unit.
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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.