Audi Audi A4 2001-2004 HVAC Specifications
Detailed technical specifications and operational guide for the HVAC system in the 2001-2004 Audi A4. Learn about system components, diagnostics, and maintenance for optimal climate control performance.
HVAC Specifications Overview Specifications
This document provides a detailed overview of the HVAC (Heating, Ventilation, and Air Conditioning) system specifications for the 2001-2004 Audi A4. It includes technical details, components, and operational guidelines to help users understand, maintain, and repair the system. Use this guide to identify key components, troubleshoot issues, and perform routine maintenance. The document is organized into major sections for easy navigation, with subsections containing detailed technical points.
How to Use
To search for specific information, use the search functionality by typing keywords related to the HVAC system, such as 'compressor,' 'heater core,' or 'blower motor.' This will help you quickly locate relevant sections and details.
Navigate through the document by selecting major sections from the table of contents. Each section is divided into subsections with detailed technical points. Use the quick reference section for key specifications at a glance.
Key Specifications
Compressor Type
A6 variable displacement
Refrigerant Type
R-134a
Blower Motor Power
40W
Heating Capacity
2.5 liters/min
Cabin Air Filter
CHARCOAL type
Available Specifications
System Overview
This section provides an overview of the HVAC system in the 2001-2004 Audi A4, including its components and functionality. It explains how the system operates and integrates with other vehicle systems.
System Overview
This section provides an overview of the HVAC system in the 2001-2004 Audi A4, including its components and functionality. It explains how the system operates and integrates with other vehicle systems.
System Components
- Compressor: Type A6 (variable displacement)
- Condenser: Tube-and-fin design with integrated dryer
- Evaporator: Parallel-flow type with expansion valve
- Heater Core: Dual-zone compatible
- Blower Motor: Dual-speed with resistor pack
- Ducting: Multi-zone air distribution system
System Operation
- Automatic climate control (optional)
- Manual climate control (base model)
- Recirculation mode for reduced dust intake
- Defrost mode for windshield clearing
- Air conditioning switch with LED indicator
- Cabin air filter ( CHARCOAL )
Heating System
This section details the heating system components, their specifications, and operational characteristics. It includes information on the heater core, controls, and associated sensors.
Heating System
This section details the heating system components, their specifications, and operational characteristics. It includes information on the heater core, controls, and associated sensors.
Heater Core Specifications
- Type: Tube-and-fin with serpentine design
- Size: 200mm x 100mm x 25mm
- Flow Rate: 2.5 liters per minute
- Pressure Rating: Up to 2 bar
- Connection Type: Quick-connect fittings
Heating Controls
- Temperature blend door actuator
- Heater control valve (water flow regulation)
- Dual-zone temperature control (optional)
- Cabin temperature sensor
- Heater fan switch (variable speed)
Air Conditioning System
This section covers the air conditioning system, including compressor, condenser, evaporator, and control components. It provides technical specifications and operational details.
Air Conditioning System
This section covers the air conditioning system, including compressor, condenser, evaporator, and control components. It provides technical specifications and operational details.
Compressor Specifications
- Type: A6 variable displacement compressor
- Displacement: 125cc
- Clutch Type: Electromagnetic
- Oil Type: PAG 46
- Operating Pressure: 1.8 bar (low), 12 bar (high)
- Power Consumption: 5-7 amps
Refrigerant System
- Refrigerant Type: R-134a
- Refrigerant Capacity: 500g
- Condenser Fan: Dual-speed with shroud
- Expansion Valve: Capillary tube type
- Low Pressure Switch: 1.8 bar cutoff
- High Pressure Switch: 24 bar cutoff
Ventilation and Airflow
This section explains the ventilation and airflow components, including the blower motor, ducting, and air filters. It provides specifications and maintenance recommendations.
Ventilation and Airflow
This section explains the ventilation and airflow components, including the blower motor, ducting, and air filters. It provides specifications and maintenance recommendations.
Blower Motor Specifications
- Type: Dual-speed with resistor pack
- Power Rating: 40W
- Airflow Rate: 200 CFM (max)
- Operating Voltage: 12V DC
- Connection Type: 3-pin connector
- Duty Cycle: Continuous operation
Air Ducting System
- Material: Polypropylene and polyurethane
- Design: Multi-zone distribution
- Features: Dampers for airflow control
- Inlets: Fresh air and recirculation modes
- Outlets: Dashboard vents, floor vents, and rear vents
- Sealing: Foam gaskets for air tightness
Controls and Sensors
This section details the electronic controls and sensors used in the HVAC system, including control modules, temperature sensors, and switches.
Controls and Sensors
This section details the electronic controls and sensors used in the HVAC system, including control modules, temperature sensors, and switches.
Control Modules
- Climate Control Module (CCM)
- Temperature control logic
- Blower motor speed control
- Air mix actuator control
- Cabin temperature sensing
- Defrost mode logic
Sensors and Switches
- Cabin temperature sensor
- Evaporator temperature sensor
- Sunlight sensor (auto dimming)
- Rain sensor (optional)
- AC switch with LED indicator
- Recirculation switch
Search Specifications
Search by specification name, value, or description
Type to search through torque specifications. Results will appear below as you type.
Component Specifications
Overview
- Type
- Manual Climate Control System
- Configuration
- Single-zone manual climate control
- Compressor Type
- Axial piston-type compressor
- Control Module
- Climatronic control module
- Refrigerant
- R-134a
Dimensions
- Evaporator Size
- 12.0 x 8.0 x 6.0 inches (305 x 203 x 152 mm)
- Condenser Size
- 24.0 x 12.0 x 1.0 inches (610 x 305 x 25 mm)
- Heater Core Size
- 8.0 x 4.0 x 4.0 inches (203 x 102 x 102 mm)
- Blower Motor Diameter
- 4.5 inches (114 mm)
- Duct Length
- Up to 60.0 inches (1524 mm)
- VentOutlet Diameter
- 2.5 inches (64 mm)
- System Weight
- Approx. 40.0 lbs (18.0 kg)
Materials
- Evaporator Coil
- Aluminum tube with aluminum fins
- Condenser Coil
- Aluminum tube with aluminum fins
- Heater Core
- Aluminum tube with copper fins
- Ducts
- Polypropylene with insulation
- Blower Motor Housing
- Polyamide (Nylon)
Features
- Airflow Modes
-
- Face vents
- Floor vents
- Defrost mode
- Temperature Control
-
- Manual temperature adjustment
- Dual-zone capability
- Heater and AC modes
- Air Quality Features
-
- Recirculation mode
- Cabin air filter
- Pollent filter
- System Controls
-
- Manual knobs for temperature and fan speed
- Slide controls for air distribution
- LCD display for temperature settings
- Diagnostics
-
- Self-test function
- Error code display
- System status monitoring
- integration
-
- Integration with vehicle electrical system
- Compatibility with optional rear seat heating
Safety Features
- Overheat Protection
- Temperature sensor with cutoff
- Pressure Relief
- Pressure relief valve on compressor
- System Protection
- Fault detection and system shutdown
Comfort Features
- Air Distribution
- Multi-directional vent outlets
- Temperature Precision
- Electronic temperature control
- Humidity Control
- Automatic humidity sensing
- Noise Reduction
- Insulated ducts and silent blower operation
Accessories
- installation Kits
-
- Mounting brackets
- Connectors and hoses
- Electrical connectors
- Maintenance Kits
-
- Cabin air filter
- Refrigerant recharge kit
- Compressor oil
- Upgrade Kits
-
- Digital climate control retrofit
- Rear seat heating kit
- Air quality sensor upgrade
Maintenance
- Service interval
- Every 12 months or 15,000 miles
- Service Items
-
- Cabin air filter replacement
- Refrigerant level check
- Compressor belt inspection
- Duct and vent inspection
- Drain check and cleaning
- Maintenance Notes
- Regular maintenance ensures optimal performance and prevents premature wear.
Warranty
- Basic Warranty
- Miles: 50,000 milesYears: 4 yearsCoverage: Parts and labor
- Extended Warranty
- Miles: 80,000 milesYears: 6 yearsCoverage: Parts and labor
- Powertrain Warranty
- Miles: 80,000 milesYears: 6 yearsCoverage: Compressor and major components
- Emissions Warranty
- Miles: 98,000 milesYears: 7 yearsCoverage: Emissions-related components
Production Details
- Manufacturer
- Volkswagen Group (Audi)
- Manufacturing Process
-
- Robotic welding
- Laser cutting
- Brazing
- Vacuum testing
- Quality Control
- inspection Steps: Leak testing, Performance testing, Noise level testingCertifications: ISO 9001, IATF 16949
- Sustainability Practices
-
- Recyclable materials
- Energy-efficient manufacturing
- Emission reduction
- Production Metrics
- Units Per Year: Approx. 100,000 unitsProduction Cycle: Approx. 8 hours per unit
Service Information for HVAC Service
Maintenance and service requirements specific to the HVAC system
- Inspect and replace cabin air filter
- Check refrigerant level and top off if necessary
- Inspect compressor belt for wear
- Clean drain hoses and evaporator drain
- Inspect ducts for leaks or damage
Essential for maintaining air quality and system efficiency.
- Inspect condenser and evaporator coils for dirt or damage
- Check system for refrigerant leaks
- Test fan speed and airflow
- Inspect heater core for leaks
- Test temperature control operation
Recommended before extreme weather seasons.
- Replace compressor if showing signs of wear
- Inspect and clean blower motor
- Replace expansion valve if necessary
- Flush and clean condenser
- Check system performance and recalibrate if needed
Critical for maintaining long-term system reliability.
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the refrigerant type and capacity for the 2001-2004 Audi A4 HVAC system?
What is the refrigerant type and capacity for the 2001-2004 Audi A4 HVAC system?
The 2001-2004 Audi A4 HVAC system uses R-134a refrigerant. The total system capacity is approximately 750-800 grams (26.5-28.2 ounces). Always refer to the under-hood label for exact specifications.
Q2 How do I reset the HVAC control module on a 2001-2004 Audi A4?
How do I reset the HVAC control module on a 2001-2004 Audi A4?
To reset the HVAC control module, turn the ignition to the 'ON' position without starting the engine. Press and hold the 'ECON' and 'AUTO' buttons simultaneously for 5 seconds. The display will flash, indicating the reset is complete.
Q3 What is the recommended interval for replacing the cabin air filter in the 2001-2004 Audi A4?
What is the recommended interval for replacing the cabin air filter in the 2001-2004 Audi A4?
The cabin air filter should be replaced every 15,000-20,000 miles or annually, whichever comes first. In dusty or polluted environments, more frequent replacement may be necessary.
Q4 What are the common symptoms of a failing HVAC blower motor in the 2001-2004 Audi A4?
What are the common symptoms of a failing HVAC blower motor in the 2001-2004 Audi A4?
Common symptoms include reduced airflow, unusual noises (such as squealing or grinding), intermittent operation, or complete failure of the blower motor. These issues may indicate a worn motor, faulty resistor, or electrical problem.
Q5 How do I diagnose a refrigerant leak in the 2001-2004 Audi A4 HVAC system?
How do I diagnose a refrigerant leak in the 2001-2004 Audi A4 HVAC system?
Use a UV dye kit or electronic leak detector to identify refrigerant leaks. Common leak points include the compressor seals, O-rings, condenser, and evaporator. Always recharge the system with the correct refrigerant type and quantity after repairs.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Audi A4 HVAC System Service Manual
Coming SoonOfficial service manual for the 2001-2004 Audi A4 HVAC system, including troubleshooting, repair procedures, and specifications.
HVAC Blower Motor Replacement Guide
Coming SoonStep-by-step guide for replacing the HVAC blower motor in the 2001-2004 Audi A4, including tools required and safety precautions.
Cabin Air Filter Replacement Tutorial
Coming SoonDetailed instructions for replacing the cabin air filter in the 2001-2004 Audi A4, with illustrations and tips for easier access.
Refrigerant Recharge Procedure
Coming SoonGuide to safely recharge the R-134a refrigerant in the 2001-2004 Audi A4 HVAC system, including pressure specifications and safety warnings.
About the Author
Expert automotive knowledge and experience
'/%3E%3Cpath d='M60 30a20 20 0 1 1 0 40 20 20 0 0 1 0-40zm0 45c16.5 0 30 7.5 30 16.8V100H30v-8.2c0-9.3 13.5-16.8 30-16.8z' fill='%23404040'/%3E%3C/svg%3E)
Diagnostic
Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.
Repair
Expert in both traditional mechanical repairs and modern vehicle systems.
Additional Expertise
Documentation
Created over 500 detailed repair guides and technical documents.
Training
Conducted technical training sessions and contributed to repair databases.
Certifications & Research
Certifications
- ASE Master Technician Certification
- Advanced Diagnostic Specialist
- Hybrid/Electric Vehicle Systems
- Performance Tuning Expert
Research & Community
Actively researches emerging technologies and contributes to automotive forums.
Legal Disclaimer
Important information about using this content
Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.
General Information
Warranty & Liability
The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.
We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.
Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.