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 DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONCLIMATE CONTROL SYSTEMS, SYSTEM SPECIFICIHKA (AUTOMATIC CLIMATE CONTROL SYSTEM)COLD-START INTERLOCK
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Cold-Start Interlock
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Cold-Start Interlock
Purpose and Operation
In order to avoid unpleasant draft during the warm-up phase (up to 30°C (86°F) left heater sensor temperature), the blower is switched to minimum, the air distribution flaps to defrost program and the compressor/[1][2]auxiliary fan and auxiliary water pump switch to "OFF". The cold start interlock is reset to "ON" after ignition "OFF" -> "ON" and heater sensor temperature 30°C (86°F).
In order to avoid unpleasant draft during the warm-up phase (up to 30°C (86°F) left heater sensor temperature), the blower is switched to minimum, the air distribution flaps to defrost program and the compressor/[1][2]auxiliary fan and auxiliary water pump switch to "OFF". The cold start interlock is reset to "ON" after ignition "OFF" -> "ON" and heater sensor temperature 30°C (86°F).
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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.