Audi Audi RS5 2010-2016 HVAC System Bolt Torque Specifications
Audi Audi RS5 2010-2016

Audi Audi RS5 2010-2016 HVAC System Bolt Torque Specifications

This page provides detailed torque specifications for bolts used in the HVAC system of the 2010-2016 Audi RS5. Includes torque values for various components such as compressor, condenser, evaporator, and expansion valve.

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

Compressor

Components related to the A/C compressor and its immediate connections.

1

Compressor Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar applications and bolt size. Proper torque is crucial for compressor alignment and to prevent vibration. Ensure mounting surfaces are clean and bolts are in good condition.
2

Compressor Clutch Bolt (Center Bolt)

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar compressor clutches. Correct torque ensures smooth clutch engagement. Check the condition of the clutch and shaft before installation.
3

Refrigerant Line Flange Bolts (Compressor)

M6 x 1.0
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on standard flange bolt. Use a torque wrench with a crowfoot if needed. Ensure new o-rings are installed. Over-tightening can damage fittings or cause leaks.

Condenser

Components related to the condenser and its mountings.

1

Condenser Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar applications and bolt size. Avoid over-tightening as it may damage the condenser. Check that the condenser is securely mounted and not vibrating.
2

Refrigerant Line Flange Bolts (Condenser)

M6 x 1.0
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Use a torque wrench with a crowfoot if needed. Ensure new o-rings are installed. Over-tightening can damage fittings or cause leaks.

Receiver Drier

Components related to the receiver drier or accumulator.

1

Receiver Drier/Accumulator Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar applications and bolt size. Ensure the component is securely held and not rattling. Do not overtighten to avoid damaging any mounting points.
2

Refrigerant Line Flange Bolts (Receiver Drier)

M6 x 1.0
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Use a torque wrench with a crowfoot if needed. Ensure new o-rings are installed. Over-tightening can damage fittings or cause leaks.

Expansion Valve

Components related to the expansion valve.

1

Expansion Valve Mounting Bolts

M5 x 0.8
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar applications and bolt size. Ensures a proper seal to avoid leaks. Be careful not to overtighten these bolts.
2

Refrigerant Line Flange Bolts (Expansion Valve)

M6 x 1.0
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Use a torque wrench with a crowfoot if needed. Ensure new o-rings are installed. Over-tightening can damage fittings or cause leaks.

Evaporator

Components related to the evaporator core and housing.

1

Evaporator Core Housing Bolts

M4 x 0.7
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Estimated value for plastic housings. Ensures housing integrity and no air leaks. Use care not to over-tighten. Check the condition of the housing pieces before install.

Blower Motor

Components related to the blower motor and its assembly.

1

Blower Motor Mounting Bolts

M5 x 0.8
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Estimated value based on similar applications and bolt size. Ensures the motor is mounted securely and does not vibrate. Avoid overtightening to protect the surrounding plastic components.

Heater Core

Components related to the heater core and its mounting.

1

Heater Core Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar applications and bolt size. Ensures the core is secured to prevent leaks from the coolant lines. Use care not to over tighten plastic housing.

Hvac Module

Fasteners used to secure the various pieces of the HVAC housing together.

1

HVAC Module Housing Bolts/Fasteners

M4 x 0.7
Torque Value
4 ft-lbs (5 N·m)
Important Notes
Estimated value based on similar plastic housing components. Ensure that all parts of the HVAC unit are properly sealed and secured. Overtightening can damage plastic or strip fasteners.

Actuators

Components related to HVAC blend door, mode door and recirculation flap actuators.

1

Blend Door Actuator Mounting Screws

M4 x 0.7
Torque Value
3 ft-lbs (4 N·m)
Important Notes
Estimated value based on similar applications. Ensure actuator is mounted securely without risk of breaking surrounding plastic components. Double-check that they operate correctly.
2

Mode Door Actuator Mounting Screws

M4 x 0.7
Torque Value
3 ft-lbs (4 N·m)
Important Notes
Estimated value based on similar applications. Ensure actuator is mounted securely without risk of breaking surrounding plastic components. Double-check that they operate correctly.
3

Recirculation Flap Actuator Mounting Screws

M4 x 0.7
Torque Value
3 ft-lbs (4 N·m)
Important Notes
Estimated value based on similar applications. Ensure actuator is mounted securely without risk of breaking surrounding plastic components. Double-check that they operate correctly.

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

Why are proper torque specifications important for HVAC components?

Proper torque is crucial to ensure a secure, leak-free, and long-lasting HVAC system. Under-tightening can cause leaks and loosening over time, while over-tightening can damage components (like cracking the plastic housing of an evaporator core) or strip threads. Both can lead to system failures, requiring costly repairs. For example, overtightening the bolts on an AC compressor could damage the housing and cause an internal leak, resulting in a complete compressor failure.

Q2

What happens if I don't have a torque wrench?

While it's highly recommended to use a torque wrench to achieve accurate torque values, you could use a calibrated hand wrench by relying on experience and feel. However, this is not advised for critical HVAC components. Guesswork can lead to errors and potential damage. Consider borrowing or purchasing a torque wrench for precise adjustments.

Q3

Are the torque specs the same for all HVAC bolts?

No, torque specifications vary based on bolt size, material, and component it's securing. For example, the bolts securing the AC compressor will have different torque requirements than the ones for the blower motor housing or the cabin filter frame. Always refer to the manufacturer's (Audi) specifications for the specific bolt you're working with. Using a generic torque value can lead to damage.

Q4

How often should I check the torque of HVAC components?

Generally, torque checks are not part of routine maintenance unless you've previously disassembled HVAC components for repair or service. However, if you notice unusual noises, leaks, or performance issues, it may be a good practice to inspect them along with other diagnostics. For new installations or repairs, re-check torque values after a short run-time to allow components to settle.

Q5

What should I do if a bolt feels like it's going to strip or becomes stripped?

Stop immediately. A stripped bolt is a serious problem and will require repair. If you feel resistance or a 'soft' feeling while tightening, stop tightening. Back it out carefully. Check the threads of both the bolt and the receiving hole. If the threads are damaged, you may need to replace the bolt and/or the tapped hole may need to be rethreaded, or a timesert used. Do not try to force it.

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 inch drive)

A precision tool for applying specific torque values to fasteners.

  • Click-type mechanism for accurate torque application
  • Range suitable for HVAC components (typically 5-30 Nm)
Learn more

Torque Wrench (3/8 inch drive)

A tool for fasteners requiring higher torque values.

  • Click-type mechanism for accurate torque application
  • Range suitable for HVAC components (typically 10-80 Nm)
Learn more

Socket Set (1/4 inch and 3/8 inch)

A collection of sockets to match various bolt and nut sizes.

  • Includes various sizes for different HVAC fasteners
  • Metric sizes specifically
Learn more

Extension Bars

Used to reach fasteners in recessed or difficult to access areas

  • Available in various lengths
  • Typically 1/4 and 3/8 drive
Learn more
Service Procedures

HVAC Compressor Bolt Torque Procedure

Procedure for properly tightening the bolts securing the HVAC compressor.

  • Locate the mounting bolts for the HVAC compressor.
  • Consult the vehicle's service manual for the correct torque specification (typically 25-30 Nm).
  • Using the appropriate socket and torque wrench, tighten the bolts evenly and in a crisscross pattern to the specified torque.
  • Verify torque settings again after the initial pass
View full procedure

Condenser Bolt Torque Procedure

Procedure for properly tightening the bolts securing the HVAC condenser.

  • Locate the mounting bolts for the condenser.
  • Consult the vehicle's service manual for the correct torque specification (typically 10-15 Nm).
  • Using the appropriate socket and torque wrench, tighten the bolts evenly and in a crisscross pattern to the specified torque.
  • Verify torque settings again after the initial pass
View full procedure

Evaporator Bolt Torque Procedure

Procedure for properly tightening the bolts securing the HVAC evaporator.

  • Locate the mounting bolts for the evaporator core.
  • Consult the vehicle's service manual for the correct torque specification (typically 8-12 Nm).
  • Using the appropriate socket and torque wrench, tighten the bolts evenly and in a crisscross pattern to the specified torque.
  • Verify torque settings again after the initial pass
View full procedure
Technical Service Bulletins

HVAC Compressor Mounting Bolt Corrosion

2015-06-15

Reports of corrosion on HVAC compressor mounting bolts leading to incorrect torque values and potential failure.

2010-2016

Resolution: Inspect bolts for corrosion. Clean, replace or apply anti-seize to bolts as needed. Use specified torque values.

HVAC Condenser Mounting Bolt Over-Tightening

2013-11-01

Reports of over-tightened condenser mounting bolts leading to damage and reduced performance.

2010-2014

Resolution: Use a calibrated torque wrench and ensure torque values are applied as specified in the service manual.

Evaporator Core Housing Bolt Failure

2016-02-22

Reports of failure of bolts holding the evaporator core housing due to improper torque during re-installation after service

2010-2016

Resolution: Replace bolts with new ones of correct type. Apply specified torque evenly. Use new gasket when re-installing.

About the Author

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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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