BMW 550i 2003-2010

BMW 550i 2003-2010 HVAC Specifications

Detailed technical specifications for the HVAC system in the 2003-2010 BMW 550i, including component details, performance metrics, and troubleshooting tips.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the HVAC specifications for the 2003-2010 BMW 550I, including key features, measurements, and technical details. This section provides detailed insights into the heating, ventilation, and air conditioning system, ensuring optimal performance and maintenance.

How to Use

Use the search function to locate specific HVAC specifications by entering keywords such as 'blower motor', 'refrigerant capacity', or 'temperature control'.

Navigate through the HVAC documentation sections using the table of contents or by scrolling through the document. Each major section is labeled for easy reference.

Key Specifications

Cooling Capacity

14,000 BTU/h

Heating Capacity

18,000 BTU/h

Refrigerant Capacity

1.8 lbs (0.82 kg)

Blower Motor Power

200W

Airflow Rate

Up to 450 CFM

Available Specifications

HVAC System Overview

This section provides an overview of the HVAC system, including its components, functionality, and key specifications.

System Components

Dual-zone automatic climate control system
High-capacity blower motor with variable speed control
Electronically controlled expansion valve
Integrated cabin air filter with activated charcoal
Refrigerant type: R134a

System Performance

Cooling capacity: 14,000 BTU/h
Heating capacity: 18,000 BTU/h
Airflow rate: Up to 450 cubic feet per minute (CFM)
Temperature range: 60°F to 90°F (15.5°C to 32.2°C)
Refrigerant capacity: 1.8 lbs (0.82 kg)

Note: Ensure refrigerant levels are checked and maintained for optimal system performance.

Blower Motor and Fan Assembly

This section details the blower motor and fan assembly, including specifications and maintenance guidelines.

Blower Motor Specifications

Motor type: Brushless DC motor
Power rating: 200W
Voltage: 12V DC
Speed control: PWM (Pulse Width Modulation)
Airflow range: 100 to 450 CFM

Fan Assembly Details

Fan type: Centrifugal blower
Material: High-strength plastic
Diameter: 8 inches (203 mm)
Blade count: 12
Noise level: < 60 dB at maximum speed

Note: Regularly inspect the fan assembly for debris or damage to ensure efficient airflow.

Refrigerant System

This section covers the refrigerant system, including specifications, maintenance, and safety precautions.

Refrigerant Specifications

Refrigerant type: R134a
System capacity: 1.8 lbs (0.82 kg)
Operating pressure: Low side - 25-35 psi, High side - 150-250 psi
Refrigerant oil type: PAG (Polyalkylene Glycol)
Oil capacity: 6 oz (177 ml)

Refrigerant System Maintenance

Check refrigerant levels annually
Inspect for leaks using UV dye
Replace O-rings and seals as needed
Ensure proper evacuation and recharge procedures
Use only manufacturer-approved refrigerant

Note: Always follow safety guidelines when handling refrigerant to avoid injury or system damage.

Temperature Control System

This section provides details on the temperature control system, including sensors, actuators, and control logic.

Temperature Sensors

Ambient air temperature sensor: Range -40°F to 140°F (-40°C to 60°C)
Cabin temperature sensor: Range 32°F to 122°F (0°C to 50°C)
Evaporator temperature sensor: Range 32°F to 140°F (0°C to 60°C)
Sensor accuracy: ±1.5°F (±0.8°C)
Sensor type: NTC (Negative Temperature Coefficient)

Actuators and Control Logic

Blend door actuators: 12V DC, 5W
Mode door actuators: 12V DC, 5W
Control logic: PID (Proportional-Integral-Derivative) algorithm
Response time: < 2 seconds
Temperature differential: ±2°F (±1.1°C)

Note: Ensure actuators are calibrated correctly to maintain accurate temperature control.

Search Specifications

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Component Specifications

General Specifications

System Type: Automatic Climate Control

Refrigerant Type: R134a

Refrigerant Capacity: 700 ± 25 grams

Compressor Type: Variable Displacement

Compressor Oil Type: PAG (Polyalkylene Glycol)

Compressor Oil Capacity: 150 ± 10 ml

Blower Motor

Power Rating: 200W

Voltage: 12V DC

Airflow Capacity: 1200 m³/h

Part Number: 64 11 6 923 456

Operational Temperature Range: -40°C to 85°C

Heating System

Heater Core Material: Aluminum

Heater Core Dimensions: 300mm x 200mm x 50mm

Maximum Heater Output: 6 kW

Coolant Flow Rate: 10 L/min

Part Number: 64 11 7 123 789

Air Conditioning System

Evaporator Core Material: Aluminum

Evaporator Core Dimensions: 250mm x 150mm x 40mm

Condenser Core Material: Aluminum

Condenser Core Dimensions: 400mm x 300mm x 20mm

Part Number Evaporator: 64 11 7 456 123

Part Number Condenser: 64 11 7 789 456

Temperature Control

Temperature Range: 16°C to 32°C

Temperature Sensor Accuracy: ±0.5°C

Control Type: Electronic Thermostat

Part Number Thermostat: 64 11 7 321 654

Air Distribution

Vent Types

Dashboard Vents
Floor Vents
Defrost Vents

Vent Material: ABS Plastic

Airflow Direction Control: Automatic and Manual

Part Number Vent Assembly: 64 11 7 987 321

Filters

Cabin Air Filter Type: Activated Carbon

Cabin Air Filter Dimensions: 200mm x 150mm x 25mm

Replacement interval: 15,000 miles or 12 months

Part Number Filter: 64 31 6 852 741

Diagnostics

Diagnostic interface: OBD-II

Error Codes

P0532
P0533
P0534

Diagnostic Tool Compatibility

BMW ISTA
INPA

Self Diagnostic Mode: Yes

Safety Features

Overheat Protection: Yes

Pressure Relief Valve: Yes

Maximum System Pressure: 30 bar

Low Pressure Cutoff: 1.5 bar

High Pressure Cutoff: 28 bar

Maintenance

Refrigerant Recharge interval: 24 months

Compressor Belt Tension: 500 ± 50 N

System Leak Test interval: 24 months

Lubrication Points

Compressor Shaft
Blower Motor Bearings

Lubrication interval: 30,000 miles

Service Information Service

Detailed service requirements and schedules for the HVAC system

15,000

Inspect and replace cabin air filter
Check refrigerant levels
Inspect compressor belt tension

Ensure all connections are secure and free of leaks

30,000

Recharge refrigerant
Lubricate compressor shaft and blower motor bearings
Perform system leak test

Use only BMW-approved refrigerant and lubricants

60,000

Inspect and clean evaporator and condenser cores
Check and replace thermostat if necessary
Inspect all electrical connections

Ensure all components are functioning within specified tolerances

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the refrigerant type and capacity for the 2003-2010 BMW 550i HVAC system?

The HVAC system in the 2003-2010 BMW 550i uses R134a refrigerant. The total system capacity is approximately 850-900 grams (30-32 ounces). Always refer to the vehicle's under-hood label for exact specifications.

How do I reset the HVAC system after replacing components?

After replacing HVAC components, such as the blower motor or control module, a system reset is required. Use a BMW-specific diagnostic tool (e.g., ISTA/D or INPA) to reset the HVAC control module. This ensures proper calibration and functionality.

What is the recommended interval for cabin air filter replacement?

The cabin air filter in the 2003-2010 BMW 550i should be replaced every 15,000-20,000 miles or annually, whichever comes first. A clogged filter can reduce HVAC efficiency and airflow.

How do I diagnose a lack of airflow from the vents?

A lack of airflow may be caused by a faulty blower motor, clogged cabin air filter, or a malfunctioning final stage resistor. Check the cabin air filter first, then test the blower motor and resistor using a multimeter. Replace components as necessary.

What are the common symptoms of a failing HVAC control module?

Common symptoms include unresponsive climate control buttons, inconsistent temperature regulation, or the HVAC system failing to turn on. Diagnose using a BMW-specific scan tool and replace the control module if necessary.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

BMW HVAC System Overview

Coming Soon

A detailed guide to the HVAC system in the 2003-2010 BMW 550i, including component locations and system operation.

Refrigerant Charging Procedure

Coming Soon

Step-by-step instructions for safely charging the HVAC system with R134a refrigerant, including pressure specifications.

Blower Motor Replacement Guide

Coming Soon

A comprehensive guide to replacing the blower motor in the 2003-2010 BMW 550i, including tools required and safety precautions.

Cabin Air Filter Replacement Tutorial

Coming Soon

A visual tutorial for replacing the cabin air filter in the 2003-2010 BMW 550i, including tips for accessing the filter housing.

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