Acura TSX 2004-2008 HVAC System Bolt Torque Specifications
Acura TSX 2004-2008

Acura TSX 2004-2008 HVAC System Bolt Torque Specifications

This page provides detailed torque specifications for various bolts associated with the HVAC (Heating, Ventilation, and Air Conditioning) system of the 2004-2008 Acura TSX. Includes compressor, condenser, and line connections.

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

Torque specifications for A/C compressor and related components.

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure proper alignment of the compressor before tightening. These bolts secure the compressor to the mounting bracket.
2

A/C Line Fittings

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use two wrenches when tightening A/C line fittings, one to hold the fitting and one to tighten the nut. Always use new O-rings.

Ac Condenser

Torque specifications for the A/C condenser and related mounting hardware.

1

A/C Condenser Mounting Bolts/Nuts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten; can damage condenser mounting points.

Ac Evaporator

Torque specifications for the A/C evaporator housing and related components.

1

A/C Evaporator Housing Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten these bolts carefully to avoid damaging plastic housing components. This is an estimated value.

Hvac Blower Motor

Torque specifications for the HVAC blower motor and related components.

1

HVAC Blower Motor Mounting Bolts/Screws

M5 x 0.8
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Use caution not to overtighten, as it can damage the plastic housing or strip threads. This is an estimated value.

Hvac Actuators

Torque specifications for HVAC mode door and air mix door actuators.

1

Mode Door Actuator Mounting Screws/Bolts

M4 x 0.7
Torque Value
4 ft-lbs (5 N·m)
Important Notes
Use caution when tightening to avoid damage to the actuator housing and the plastic components. This is an estimated value.
2

Air Mix Door Actuator Mounting Screws/Bolts

M4 x 0.7
Torque Value
4 ft-lbs (5 N·m)
Important Notes
Use caution when tightening to avoid damage to the actuator housing and plastic components. This is an estimated value.

Ac Receiver Drier

Torque specifications for the A/C receiver drier and related mounting hardware.

1

A/C Receiver Drier Mounting Bolts/Strap

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
The receiver drier may be secured by bolts or straps. Ensure proper positioning before tightening. This is an estimated value.

Ac Pressure Sensors

Torque specifications for the high and low A/C pressure sensors.

1

High & Low A/C Pressure Sensor

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Make sure to use new O-rings before installing the sensor. Ensure a tight seal by using a torque wrench. This is an estimated value.

Ac Expansion Valve

Torque specifications for the A/C expansion valve mounting.

1

A/C Expansion Valve Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Use new O-rings when mounting the expansion valve. Torque to spec to ensure a good seal. This is an estimated value.

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 is using the correct torque important for HVAC bolts?

Using the correct torque specification is crucial for HVAC system bolts to ensure proper sealing and prevent damage. Over-tightening can strip threads or crack components, leading to leaks or malfunctions. Under-tightening can result in loose connections and refrigerant leaks, impacting system performance and potentially causing compressor failure. Proper torque ensures the system's components are securely fastened without overstressing them.

Q2

What happens if I over-torque an HVAC bolt?

Over-torquing an HVAC bolt on your 2004-2008 Acura TSX can cause a variety of issues. You risk stripping the threads of the bolt or the component it's threading into, making it difficult to tighten properly. It can also crack housings, flanges, or other delicate parts of the HVAC system. For example, over-torquing the bolts on the compressor clutch can lead to premature clutch failure or even damage the compressor itself.

Q3

Can I reuse old HVAC bolts?

Generally, it is not recommended to reuse old HVAC bolts, especially those used in critical sealing applications like the compressor or refrigerant lines. These bolts can stretch over time with repeated use and exposure to heat and vibrations, making them unreliable. Using new bolts ensures a proper torque is achieved and reduces the risk of leaks or component failure. Consider a bolt's condition carefully; if it shows any signs of wear or corrosion, it's best practice to replace it.

Q4

What tools do I need to properly torque HVAC bolts?

You will need a torque wrench that is appropriately calibrated for the torque values of the bolts you are working with. A set of sockets in appropriate sizes is also necessary. Avoid using standard wrenches or impact tools for tightening HVAC bolts, as they do not allow you to achieve precise torque, potentially leading to over or under-tightening. Consider using a click-type or digital torque wrench, depending on the job's required precision.

Q5

Are torque specs the same for all HVAC components?

No, torque specifications vary depending on the HVAC component and the bolt size. Compressor mounting bolts, refrigerant line fittings, and condenser bolts all require different torque values. Always consult the vehicle's service manual or a reliable source to obtain the correct torque specifications for the specific component you are working on in your 2004-2008 Acura TSX. Failure to use the correct specification could lead to damage or performance issues.

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 torque wrench with a 1/4-inch drive is essential for applying accurate torque specifications to smaller bolts and fasteners in the HVAC system.

  • Accurate torque measurement
  • Click-type mechanism
Learn more

Torque Wrench (3/8-inch Drive)

A 3/8-inch drive torque wrench is useful for larger bolts and fasteners commonly found in the HVAC system.

  • Higher torque range than 1/4-inch
  • Durable construction
Learn more

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

A comprehensive socket set, including both 1/4-inch and 3/8-inch drive sizes, is required for accessing various bolt heads within the HVAC system.

  • Metric sizes
  • Variety of depths
Learn more

Extension Bars

Extension bars provide additional reach to access recessed or hard-to-reach bolts and fasteners in the HVAC system.

  • Different lengths
  • Durable steel construction
Learn more

Universal Joint

A universal joint (or swivel adapter) allows for angled access to fasteners in tight spaces.

  • Flexible movement
  • Compatible with various drive sizes
Learn more
Service Procedures

HVAC Compressor Clutch Bolt Torque Procedure

Procedure for properly torquing the bolt securing the HVAC compressor clutch.

  • Locate the clutch bolt at the center of the compressor clutch.
  • Using the appropriate socket and extension, position the socket onto the bolt.
  • Set the torque wrench to the manufacturer's specified torque value (typically around 12-15 ft-lbs, verify before application).
  • Slowly and smoothly tighten the bolt until the torque wrench clicks.
  • Recheck the torque reading to ensure accurate tightening.
  • Do not overtighten, which can damage the clutch.
View full procedure

HVAC Line Fitting Torque Procedure

Procedure for properly torquing the fitting connections on the refrigerant lines within the HVAC system. Note that these fittings often have specific seals that require delicate handling.

  • Identify the specific fittings being torqued, noting their size and material (aluminum is very common).
  • Using the appropriate size and style wrench, carefully position it on the fitting.
  • Set the torque wrench to the manufacturer's specified torque value for the fitting (typically around 15-20 ft-lbs, refer to specifications).
  • Tighten the fitting gradually until the torque wrench clicks.
  • Ensure the fittings are properly aligned during tightening.
  • Check for any signs of leaks or damage after installation.
  • Overtightening may result in leaks or damage to the seal.
View full procedure

Condenser Mounting Bolt Torque Procedure

Procedure for properly torquing the bolts that secure the condenser to the vehicle's frame.

  • Locate the condenser mounting bolts.
  • Using the correct size socket and extension, position the socket onto the bolt.
  • Set the torque wrench to the manufacturer's specified torque value (typically around 18-22 ft-lbs).
  • Tighten the bolt evenly, working in a criss-cross pattern if multiple bolts are used.
  • Tighten the bolts until the torque wrench clicks, ensuring each bolt is torqued to spec.
  • Recheck the torque of each bolt after tightening.
  • Do not overtighten, which can damage the condenser or its mounting points.
View full procedure

Evaporator Core Housing Bolt Torque Procedure

Procedure for properly torquing the bolts that secure the evaporator core housing.

  • Locate the bolts securing the evaporator core housing.
  • Using the appropriate sized socket and extension, position the socket onto the bolt.
  • Set the torque wrench to the manufacturer's specified torque value (typically around 8-10 ft-lbs).
  • Tighten the bolts until the torque wrench clicks, ensuring each bolt is torqued to the specific value.
  • Recheck torque on each bolt after tightening.
  • Avoid overtightening which may crack the housing.
View full procedure
Technical Service Bulletins

HVAC Compressor Clutch Bolt Loosening Issue

2006-04-15

Some 2004-2006 TSX models have experienced issues with the HVAC compressor clutch bolt loosening over time, leading to clutch slippage and noise.

2004-2006 Acura TSX

Resolution: Inspect and re-torque the compressor clutch bolt to the specified torque. Apply a thread-locking compound to prevent future loosening, consider bolt replacement if needed. Verify proper clutch operation after repair.

Refrigerant Line Fitting Leakage

2007-02-28

Reports of refrigerant leaks at the HVAC line fittings due to improper torque or seal degradation have been reported in 2005-2007 Acura TSX models.

2005-2007 Acura TSX

Resolution: Inspect all HVAC line fittings for leaks. Replace any damaged O-rings and seals. Ensure proper torque specification is applied when reassembling. Vacuum and recharge the system after repairs.

Condenser Mounting Bolt Corrosion

2008-11-10

Some 2006-2008 Acura TSX vehicles may exhibit corrosion at the condenser mounting bolts, potentially leading to loosening and instability.

2006-2008 Acura TSX

Resolution: Inspect the condenser mounting bolts for corrosion. Clean or replace the bolts as necessary. Apply a corrosion inhibitor during reassembly. Torque to spec.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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