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 SPECIFICCOLD-START INTERLOCK
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Cold-Start Interlock
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Cold-Start Interlock
Blower interlock circuit - Graph:
Blower interlock circuit - Graph
Flap interlocking - Graph:
Flap interlocking - Graph
Operation
The cold-start interlock acts on the blower and the flaps.
When the car is started with the engine cold, the cold-start inhibit circuit prevents drafts of cold air from being discharged to the car's interior. The interlock function take effect only in the preselected settings RECIRCULATED AIR HEATING TOP/BOTTOM, AUTOMATIC HEATING and AIR CONDITIONING, and then only when the control unit lever is advanced beyond 66%. A percentage scale is marked on the control unit and is visible after detaching the lower facia trim. The cold-start inhibiting circuit cutout according to regulator setting is designed to ensure that the cooling action none the less starts immediately if the car's interior is very warm.
The coolant temperature signal is derived from the coolant thermometer.
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.