Audi Audi S5 2007-2016 HVAC System Bolt Torque Specifications
Audi Audi S5 2007-2016

Audi Audi S5 2007-2016 HVAC System Bolt Torque Specifications

Detailed torque specifications for all HVAC system bolts on the 2007-2016 Audi S5, including compressor, condenser, evaporator, and expansion valve bolts.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Ac Compressor

Specifications for fasteners related to the AC compressor, including mounting and clutch components. Proper torque is crucial for secure mounting and reliable operation.

1

AC Compressor Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the AC compressor to the engine block or mounting bracket. Proper torque is critical for secure mounting. Estimated value based on similar M8 applications.
2

AC Compressor Clutch Bolt (Center Bolt)

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
This bolt secures the clutch to the compressor shaft. Overtightening can cause premature bearing failure. Estimated value based on similar M6 applications.

Ac Condenser

Specifications for fasteners related to the AC condenser and its mounting. Correct torque prevents damage to the condenser and mounting structure.

1

AC Condenser Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the AC condenser to the radiator support or front structure. Estimated value based on M6 bolt size and application.

Ac Lines

Specifications for fasteners related to AC line connections at the compressor, condenser and evaporator. Proper torque is essential to prevent refrigerant leaks.

1

AC Line Connections (Compressor/Condenser/Evaporator)

M8 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
These bolts/nuts secure refrigerant lines. Estimated value. May vary. Replace O-rings. Lubricate with refrigerant oil. Specific fittings should be verified.

Receiver Drier

Specifications for fasteners related to the receiver/drier. Correct torque prevents damage to the unit or its mounting tabs.

1

Receiver/Drier Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the receiver/drier to the frame or condenser. Estimated value based on M6 application.

Expansion Valve

Specifications for fasteners related to the expansion valve. Proper torque ensures correct alignment and prevents damage to the valve or evaporator housing.

1

Expansion Valve Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts/screws secure the expansion valve. Estimated value based on M6 application.

Evaporator Case

Specifications for fasteners related to the evaporator case. Correct torque is important for sealing and reducing vibrations.

1

Evaporator Case Mounting Bolts (Main)

M8 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
These bolts secure the evaporator case to the firewall or dash structure. Estimated value based on M8 bolt and similar applications.
2

Evaporator Case Mounting Bolts (Smaller Access Cover/Housing)

M5 x 0.8
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Secures the smaller plastic covers on the evap box housing. Overtightening can damage plastic threads. Estimated value based on M5 application.

Blower Motor

Specifications for fasteners related to the blower motor. Correct torque prevents damage to the plastic housing.

1

Blower Motor Mounting Screws/Bolts

M4 x 0.7
Torque Value
5 ft-lbs (7 N·m)
Important Notes
These are smaller fasteners, often screws securing the blower motor to its housing. Estimated value based on plastic application.

Hvac Control Module

Specifications for fasteners related to the HVAC control module. Light torque prevents damage to electronics or plastic mounting points.

1

HVAC Control Module Mounting Screws/Bolts

M3 x 0.5
Torque Value
3 ft-lbs (4 N·m)
Important Notes
These secure the electronic control unit. Estimated value based on electronic component application.

Blend Door Actuators

Specifications for fasteners related to the blend door actuators. Correct torque prevents damage to the plastic housing or stripping the screws.

1

Blend Door Actuator Mounting Screws

M4 x 0.7
Torque Value
3 ft-lbs (4 N·m)
Important Notes
Secures plastic blend door actuators. Estimated value based on plastic application.

Temperature Sensors

Specifications for fasteners related to the temperature sensors. Light torque prevents damage to the sensor or plastic mounting points.

1

Temperature Sensor Mounting Screws

M2.5 x 0.45
Torque Value
2 ft-lbs (3 N·m)
Important Notes
Small screws securing temperature sensors. Estimated value based on electronic component application.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

What is the recommended torque specification for the HVAC system bolts on my 2007-2016 Audi S5?

The recommended torque specification for the HVAC system bolts on your 2007-2016 Audi S5 can be found in the repair manual or on the manufacturer's website. Typically, the torque specification ranges from 10-20 Nm (7-14 ft-lbs) for most bolts, but it's essential to consult the specific repair manual for your vehicle to ensure accuracy.

Q2

Why is it important to follow the recommended torque specification for the HVAC system bolts?

Following the recommended torque specification for the HVAC system bolts is crucial to ensure the system operates correctly and efficiently. Over-torquing can damage the bolts, while under-torquing can lead to leaks or system failure. Proper torque specification also helps prevent damage to other components, such as the compressor or condenser.

Q3

How often should I inspect and maintain the HVAC system bolts on my 2007-2016 Audi S5?

It's recommended to inspect the HVAC system bolts every 12,000 to 15,000 miles or during routine maintenance. Check for signs of wear, corrosion, or damage, and tighten or replace the bolts as needed. Regular maintenance can help prevent system failures and ensure optimal performance.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Torque Wrench (1/4" Drive)

A 1/4" drive torque wrench is essential for accurately tightening smaller bolts found in the HVAC system, especially in tight spaces.

  • Precise torque settings
  • Click-type mechanism for accurate readings
  • Small size for maneuverability
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is needed for larger bolts and connections in the HVAC system.

  • Wider torque range
  • Durable construction
  • Standard drive size for common bolts
Learn more

Socket Set (Metric)

A comprehensive metric socket set with various sizes is required to match the different bolt heads in the HVAC system.

  • Range of sizes, including common hex sizes
  • Standard and deep well sockets
  • Durable materials
Learn more

Extension Bars

Extension bars are useful to reach bolts in recessed areas or difficult-to-access locations within the HVAC system.

  • Varying lengths for different needs
  • Secure locking mechanisms
  • Durable materials
Learn more

Universal Joint/Swivel Adapter

A universal joint or swivel adapter allows for torque application at an angle, making it easier to reach bolts in awkward spots.

  • Flexible movement
  • Secure attachment
  • Durable build
Learn more
Service Procedures

HVAC Compressor Bolt Torque Procedure

This procedure outlines the correct method for tightening the bolts securing the HVAC compressor.

  • Locate all mounting bolts of the HVAC compressor.
  • Refer to the torque specification for each bolt size.
  • Using the appropriate socket and torque wrench, gradually tighten each bolt in a star pattern.
  • Do not overtighten the bolts, as this can damage the compressor or mounting points.
  • Re-check the torque of each bolt after initial tightening.
View full procedure

HVAC Condenser Mounting Bolt Torque Procedure

This procedure details the correct way to tighten the condenser mounting bolts.

  • Identify all the mounting points of the HVAC condenser.
  • Consult the torque specifications for the mounting bolts.
  • Tighten each bolt to the specified torque using the correct socket and torque wrench.
  • Tighten bolts in a cross pattern or sequence recommended by manufacturer.
  • Re-check and verify the torque of each bolt after initial installation.
View full procedure

HVAC Evaporator Case Bolt Torque Procedure

This procedure details the proper torque procedure for the bolts of the HVAC evaporator case.

  • Locate and identify all the bolts holding the HVAC evaporator case.
  • Consult the torque specifications for those bolts.
  • Use the appropriate socket and torque wrench to tighten the bolts evenly.
  • Ensure correct tightening pattern and do not over tighten.
  • Double check torque to the correct settings.
View full procedure
Technical Service Bulletins

HVAC Compressor Bolt Failure Due to Incorrect Torque

2010-05-15

A number of reports indicate HVAC compressor mounting bolt failures due to incorrect torque application during service. These failures can lead to compressor damage and/or system inoperability.

2007-2010

Resolution: Ensure proper torque is applied to all HVAC compressor bolts according to manufacturer's specifications. Replace any bolts that show signs of damage or deformation. Use new bolts when servicing.

HVAC Condenser Mounting Bolt Corrosion

2013-11-20

Some instances of HVAC condenser mounting bolt corrosion have been reported. This can lead to weakened connections and potential separation of the condenser. Incorrect torque can exacerbate the issue.

2007-2013

Resolution: Inspect the mounting bolts for any signs of corrosion. Replace corroded bolts with new, corrosion-resistant bolts. Apply the correct torque during installation. Apply anti-seize to the new bolts to prevent future issues.

HVAC Evaporator Housing Bolt Crack

2015-07-01

A technical issue has been detected with evaporator housing bolt crack. This has been attributed to uneven torque being applied and over torquing of the bolts. Uneven torque causes stress to the housing and a crack or leak is possible

2012-2016

Resolution: Ensure that all bolts are tightened using the correct torque and sequence. If crack is found replace the housing unit.

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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