1993 BMW 740I A/C & Heater Service (ONLINE REPAIR MANUALS)

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A/C & HEATER SERVICE PROCEDURES FOR 1993 BMW 740I AUTOMOBILES

Air Conditioner and Heater Service Includes module configuration procedures, general service, maintenance, automatic temperature control, compressor services, electric cooling fans, vacuum diagrams, specifications, and manual air conditioning and heater diagnostics and replacement procedures for domestic and imported 1993 BMW 740I cars and light trucks from 1990+

Imported Cars & Light Trucks & Vans -> 1993-95 -> System Inspection -> Compressor -> Condenser -> Evaporator -> Receiver/Drier -> Refrigerant Line Restrictions -> Thermostatic Expansion Valve
Vehicle: 1993 BMW 740I 4.0 V8 GAS

While a detailed diagnostic procedure for all air conditioning systems would be impractical due to the many variations in construction and operation, there are three fundamental components of a total diagnosis:

  • Refrigerant systems must have an adequate, but not excessive charge.
  • Determination must be made whether the refrigerant system is governed by a cycling clutch compressor or by valves which control evaporator pressure.
  • The air distribution system (blower motor, switches, vacuum lines and air ducts) must be operational before checking the refrigera...

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A/C & HEATER SERVICE PROCEDURES FOR 1993 BMW 740I AUTOMOBILES

Air Conditioner and Heater Service Includes module configuration procedures, general service, maintenance, automatic temperature control, compressor services, electric cooling fans, vacuum diagrams, specifications, and manual air conditioning and heater diagnostics and replacement procedures for domestic and imported 1993 BMW 740I cars and light trucks from 1990+

Imported Cars & Light Trucks & Vans -> 1993-95 -> Evacuating System -> Using Charging Station -> With Vacuum Pump
Vehicle: 1993 BMW 740I 4.0 V8 GAS

With Vacuum Pump

Vacuum pumps suitable for removing air and moisture from A/C systems are commercially available. A specification for system pump down used here is 28-291/2 inches vacuum. This reading can be attained at or near sea level only. For each 1000 feet of altitude this operation is performed, the reading will be 1 inch vacuum higher. For example, at 5000 feet elevation, only 23-241/2 inches of vacuum can be obtained. The system refrigerant must be completely recovered before it can be evacuated. Damage to the vacuum pump will result if pressurized refrige...

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A/C & HEATER SERVICE PROCEDURES FOR 1993 BMW 740I AUTOMOBILES

Air Conditioner and Heater Service Includes module configuration procedures, general service, maintenance, automatic temperature control, compressor services, electric cooling fans, vacuum diagrams, specifications, and manual air conditioning and heater diagnostics and replacement procedures for domestic and imported 1993 BMW 740I cars and light trucks from 1990+

BMW -> Component Replacement & Adjustment -> CONTROL ASSEMBLY, REPLACE -> 525 & 535
Vehicle: 1993 BMW 740I 4.0 V8 GAS

525 & 535

  • Disconnect battery ground cable and remove console as outlined in "Evaporator Core, Replace" pr...

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A/C & HEATER SERVICE PROCEDURES FOR 1993 BMW 740I AUTOMOBILES

Air Conditioner and Heater Service Includes module configuration procedures, general service, maintenance, automatic temperature control, compressor services, electric cooling fans, vacuum diagrams, specifications, and manual air conditioning and heater diagnostics and replacement procedures for domestic and imported 1993 BMW 740I cars and light trucks from 1990+

BMW -> Automatic Temperature Control System Diagnosis & Testing -> A/C SYSTEM DIAGNOSIS & TESTING -> 3 SERIES -> 5 SERIES -> Trouble Code 01-Right Temperature Control Wheel -> Trouble Code 04-Right Heater Sensor -> Trouble Code 07-Evaporator Sensor -> Trouble Code 10-Outside Sensor -> Trouble Code 13-Interior Sensor -> Trouble Code 16-Interior Sensor Blower -> Trouble Code 25-Left Temperature Control Wheel -> Trouble Code 28-Left Heater Sensor -> Trouble Code 31-Air Flow Control Wheel -> Trouble Code 34-Mixing Air Control Wheel -> Trouble Code 38-Auxiliary Water Pump Relay -> Trouble Code 40-Left Water Valve -> Trouble Code 44-A/C Compressor Signal Or Auxiliary Fan Relay -> Trouble Code 44-A/C Relay/Auxiliary Fan Relay -> Trouble Code 46-Right Water Valve -> Trouble Code 47-A/C Signal To DME Control Unit -> Trouble Code 48-Rear Window Defroster -> Trouble Code 48-Rear Window Defroster Relay -> Trouble Code 52-Fresh Air Flap Motor -> Trouble Code 55-Air Recirculation Flap Motor -> Trouble Code 56-AUC Signal -> Trouble Code 61-Mixing Air Flap Motor -> Trouble Code 92-Terminal 50 On Longer Than 3 Minutes -> Trouble Code 94-Independent Heating/Independent Ventilation
Vehicle: 1993 BMW 740I 4.0 V8 GAS

3 SERIES

The automatic climate control unit is capable of detecting system malfunctions and storing a related trouble code. These trouble codes may be read from control unit memory using the BMW service tester, or equivalent. Follow manufacturer's instructions to display trouble codes.

The display "current defect" indicates that the malfunction currently exists. If a "current defect" applies to the temperature sensors or control wheels, a substitute value provided by the control unit is used. The substitute value is replaced by the current value when t...

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A/C & HEATER SERVICE PROCEDURES FOR 1993 BMW 740I AUTOMOBILES

Air Conditioner and Heater Service Includes module configuration procedures, general service, maintenance, automatic temperature control, compressor services, electric cooling fans, vacuum diagrams, specifications, and manual air conditioning and heater diagnostics and replacement procedures for domestic and imported 1993 BMW 740I cars and light trucks from 1990+

Electrical Symbol & Wire Color Code Identification -> Electrical Symbol Identification -> Imported Vehicles
Vehicle: 1993 BMW 740I 4.0 V8 GAS

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A/C & HEATER SERVICE PROCEDURES FOR 1993 BMW 740I AUTOMOBILES

Air Conditioner and Heater Service Includes module configuration procedures, general service, maintenance, automatic temperature control, compressor services, electric cooling fans, vacuum diagrams, specifications, and manual air conditioning and heater diagnostics and replacement procedures for domestic and imported 1993 BMW 740I cars and light trucks from 1990+

BMW -> Wiring Diagrams -> Temperature Controls
Vehicle: 1993 BMW 740I 4.0 V8 GAS

[[table data]]

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