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)RELAY & WATER VALVE SWITCHING
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Relay & Water Valve Switching
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Relay & Water Valve Switching
Operation
All relays and water valves are switched by applying ground to the corresponding output of the control unit. Due to the design of the inner circuitry of the control unit, it is not possible to differentiate between a short to negative and a break. The diagnostic procedure for the control unit only covers the control circuit of the relays.
RENDER: 1.0x
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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.