Audi Audi A4 1995-2000 HVAC Specifications
Detailed technical specifications and operational guide for the 1995-2000 Audi A4 HVAC system. Includes component details, refrigerant specifications, climate control module functionality, and troubleshooting tips.
Audi A4 (1995-2000) HVAC Specifications Overview Specifications
This document provides a comprehensive overview of the HVAC (Heating, Ventilation, and Air Conditioning) system specifications for the 1995-2000 Audi A4. It includes detailed technical information, operational parameters, and maintenance guidelines. Use this guide to understand the system's components, troubleshoot common issues, and perform routine maintenance. The document is organized into major sections for easy navigation, with subsections providing in-depth details.
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Key Specifications
Heating System Maximum Output
40°C (104°F)
Air Conditioning Refrigerant
R-12 (convertible to R-134a)
Blower Motor Speed Range
0-1500 RPM
Cabin Airflow Rate
200 cubic meters/hour
Recommended Coolant Temperature
80-90°C (176-194°F)
Available Specifications
Heating System
The heating system in the 1995-2000 Audi A4 is designed to provide consistent cabin warmth during cold weather conditions. It includes components such as the heater core, blower motor, and temperature control valve.
Heating System
The heating system in the 1995-2000 Audi A4 is designed to provide consistent cabin warmth during cold weather conditions. It includes components such as the heater core, blower motor, and temperature control valve.
Heating System Components
- Heater core located behind the dashboard
- Blower motor with variable speed control
- Temperature control valve regulates coolant flow
- Heater hoses connect engine to heater core
- Cabin air filter improves air quality
Heating System Operational Parameters
- Maximum heater output: 40°C (104°F)
- Recommended coolant temperature: 80-90°C (176-194°F)
- Blower motor speed range: 0-1500 RPM
- Heater core pressure limit: 1.5 bar
- Cabin air recirculation mode available
Cooling System
The cooling system in the Audi A4 is responsible for maintaining optimal engine temperature and providing air conditioning for cabin comfort. It includes the compressor, condenser, and evaporator.
Cooling System
The cooling system in the Audi A4 is responsible for maintaining optimal engine temperature and providing air conditioning for cabin comfort. It includes the compressor, condenser, and evaporator.
Air Conditioning Components
- Compression-type AC compressor
- Condenser mounted in front of radiator
- Evaporator located behind dashboard
- Expansion valve regulates refrigerant flow
- Refrigerant type: R-12 (convertible to R-134a)
Cooling System Operational Parameters
- Compressor operating pressure: 10-30 bar
- Evaporator temperature range: 3-8°C (37-46°F)
- Condenser fan activation temperature: 85°C (185°F)
- Refrigerant charge capacity: 600g R-12
- Recommended AC system pressure: 75-90 psi
Ventilation System
The ventilation system ensures proper air circulation and cabin comfort by managing airflow, filtration, and humidity levels.
Ventilation System
The ventilation system ensures proper air circulation and cabin comfort by managing airflow, filtration, and humidity levels.
Ventilation System Components
- Cabin air filter with activated charcoal option
- Fresh air intake ducts located under hood
- Recirculation mode for reduced dust intake
- Manual and automatic climate control options
- Defrost and demist functions available
Ventilation System Operational Parameters
- Maximum airflow rate: 200 cubic meters per hour
- Filter replacement interval: every 15,000 miles
- Humidity sensor available on later models
- Air recirculation mode reduces exterior air intake
- Defrost mode prioritizes windshield heating
Controls and Electrical
The HVAC system is controlled by a combination of manual and electronic components, ensuring precise temperature and airflow regulation.
Controls and Electrical
The HVAC system is controlled by a combination of manual and electronic components, ensuring precise temperature and airflow regulation.
HVAC Control Unit
- Manual controls for temperature, fan speed, and airflow
- Electronic control module (ECM) on later models
- Blower motor resistor regulates fan speed
- Temperature sensor monitors cabin and engine temperature
- Fuses and relays protect electrical components
Electrical Specifications
- Blower motor power consumption: 40-60W
- AC compressor clutch engagement voltage: 12V DC
- Cabin air filter monitor available on 1998+ models
- Fuse rating for HVAC components: 10-20A
- Recommended battery capacity for HVAC operation: 45Ah
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Component Specifications
Overview
- Type
- Manual Climate Control System
- Configuration
- Rear-mounted HVAC module
- Platform
- Audi A4 (B5)
- Material
- Plastic and steel components
- Location
- Behind dashboard and under hood
- Generation
- B5 (1995-2000)
Dimensions
- Control Module Length
- 11.8 inches (300 mm)
- Blower Motor Diameter
- 5.5 inches (140 mm)
- Evaporator Core Size
- 13.4 x 8.7 inches (340 x 220 mm)
- Heater Core Size
- 10.6 x 6.7 inches (270 x 170 mm)
- Air Ducting Diameter
- 3.9 inches (100 mm)
- System Weight
- 44 lbs (20 kg)
- Refrigerant Capacity
- 24 oz (680 g) R-12
Materials
- Control Module
- High-strength ABS plastic
- Blower Motor Housing
- Steel and aluminum alloys
- Evaporator And Heater Cores
- Aluminum with copper tubing
- Air Ducting
- Flexible rubber and polypropylene
Features
- Temperature Control
-
- Manual temperature adjustment
- Dual-zone temperature control
- Heater and AC modes
- Recirculation mode
- Defrost function
- Air Distribution
-
- Dash vents
- Floor vents
- Rear seat heating ducts
- Windshield defrost vents
- Filtration
-
- Cabin air filter
- Activated carbon filter option
- Pollen filter option
- Heating
-
- Water-cooled heater core
- Electric cooling fan
- Heater core bypass valve
- Cooling
-
- R-12 refrigerant system
- Mechanical compressor
- Expansion valve
- Condenser fan
- Controls
-
- Manual knobs and sliders
- Cable-actuated controls
- Vacuum-actuated air doors
Safety Features
- Pressure Relief
-
- Over-pressure safety valve
- Refrigerant leak detection
- System Protection
-
- Low refrigerant pressure switch
- High-pressure cut-off switch
- Electrical Protection
-
- Fuse protection for blower motor
- Relay protection for compressor
Comfort Features
- Climate Control
-
- Manual air conditioning
- Heater and AC combination mode
- Economy mode
- Air Quality
-
- Cabin air filter
- Recirculation mode
- Odor-reducing filter option
- Noise Reduction
-
- Insulated ducting
- Silent blower motor operation
- Dampened control actuation
- Ergonomic Controls
-
- Intuitive knob layout
- Easy-reach controls
- Clear temperature markings
Accessories
- installation Kits
-
- R-12 recharge kit
- Cabin air filter replacement kit
- Heater core bypass kit
- Maintenance Kits
-
- Blower motor replacement kit
- Control module repair kit
- Ducting sealant kit
- Upgrade Kits
-
- Retrofit R-134a conversion kit
- Digital climate control upgrade
- Charcoal filter upgrade
Maintenance
- Service interval
-
- Miles: 15,000 miles, Months: 12 months, Items: Inspect cabin air filter,Check refrigerant level,Inspect ducting for leaks,Test heater and AC operation, Note: Replace cabin air filter if dirty
- Miles: 30,000 miles, Months: 24 months, Items: Replace cabin air filter,Check blower motor operation,Inspect heater core hoses,Test AC performance, Note: Check for refrigerant leaks
- Miles: 60,000 miles, Months: 48 months, Items: Replace refrigerant drier,Inspect compressor clutch,Clean condenser fins,Test all system functions, Note: Consider R-12 recharge if low
- Maintenance Notes
-
- Always wear safety gloves when handling refrigerants
- Ensure system is discharged before servicing
- Use only OEM or equivalent replacement parts
- Check for system leaks annually
Warranty
- Basic Warranty
- Miles: 50,000 milesYears: 3 yearsCoverage: Full system coverage
- Powertrain Warranty
- Miles: 70,000 milesYears: 5 yearsCoverage: Compressor and major components
- Corrosion Warranty
- Miles: 100,000 milesYears: 10 yearsCoverage: Sheet metal and external components
- Emissions Warranty
- Miles: 80,000 milesYears: 7 yearsCoverage: Emissions-related components
Production Details
- Manufacturer
- Audi AG
- Manufacturing Process
-
- Robotic welding
- Laser cutting
- Powder coating
- Vacuum testing
- Quality Control
- inspection Points: Refrigerant leakage test, Electrical system test, Airflow test, Temperature control testCertifications: ISO 9001, ISO 14001, TS 16949
- Sustainability Practices
-
- Recyclable materials
- Energy-efficient manufacturing
- Low-VOC paints
- Recycled packaging
- Production Metrics
- Units Per Day: 500 unitsCycle Time: 45 minutesScrap Rate: 1.2%Efficiency: 98.5%
Service Information for HVAC Service
Maintenance and service requirements specific to this component
- Inspect cabin air filter
- Check refrigerant level
- Inspect ducting for leaks
- Test heater and AC operation
Replace cabin air filter if dirty
- Replace cabin air filter
- Check blower motor operation
- Inspect heater core hoses
- Test AC performance
Check for refrigerant leaks
- Replace refrigerant drier
- Inspect compressor clutch
- Clean condenser fins
- Test all system functions
Consider R-12 recharge if low
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the refrigerant type and capacity for the HVAC system in a 1995-2000 Audi A4?
What is the refrigerant type and capacity for the HVAC system in a 1995-2000 Audi A4?
The HVAC system in the 1995-2000 Audi A4 uses R134a refrigerant. The total system capacity is approximately 750-850 grams (26.5-30 ounces), depending on the specific model and trim. Always refer to the under-hood label for exact specifications.
Q2 How do I diagnose a lack of airflow from the HVAC vents?
How do I diagnose a lack of airflow from the HVAC vents?
A lack of airflow can be caused by a faulty blower motor, clogged cabin air filter, or a malfunctioning HVAC control unit. First, check the cabin air filter located behind the glove box. If the filter is clean, inspect the blower motor and its resistor. Use a multimeter to test for proper voltage at the blower motor connector. If voltage is present but the motor does not operate, replace the blower motor.
Q3 What is the procedure for recharging the HVAC system with refrigerant?
What is the procedure for recharging the HVAC system with refrigerant?
To recharge the HVAC system, first connect a manifold gauge set to the low-pressure port (located on the suction line near the firewall). Start the engine and set the HVAC system to maximum cooling. Add refrigerant slowly while monitoring the low-pressure gauge. The target pressure range is 25-45 psi, depending on ambient temperature. Do not overfill, as this can damage the compressor.
Q4 How do I reset the HVAC control unit on a 1995-2000 Audi A4?
How do I reset the HVAC control unit on a 1995-2000 Audi A4?
To reset the HVAC control unit, turn the ignition key 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. This procedure clears any stored fault codes and resets the system to default settings.
Q5 What are the common symptoms of a failing HVAC compressor?
What are the common symptoms of a failing HVAC compressor?
Common symptoms include unusual noises (such as grinding or squealing), reduced cooling performance, and visible refrigerant leaks. If the compressor clutch does not engage when the AC is turned on, check the clutch relay, wiring, and refrigerant pressure. A faulty compressor should be replaced promptly to avoid further system damage.
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 1995-2000 Audi A4 HVAC system, including detailed repair procedures, wiring diagrams, and troubleshooting guides.
HVAC Refrigerant Charging Guide
Coming SoonStep-by-step guide for safely charging the HVAC system with R134a refrigerant, including pressure specifications and safety precautions.
Blower Motor Replacement Tutorial
Coming SoonDetailed tutorial on replacing the HVAC blower motor in a 1995-2000 Audi A4, including tools required and step-by-step instructions.
HVAC Control Unit Reset Procedure
Coming SoonInstructions for resetting the HVAC control unit to clear fault codes and restore default settings.
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