Acura TSX 2009-2014 HVAC System Bolt Torque Specifications
Acura TSX 2009-2014

Acura TSX 2009-2014 HVAC System Bolt Torque Specifications

Detailed torque specifications for HVAC system bolts on the 2009-2014 Acura TSX. Includes values for compressor, condenser, evaporator, and other related components.

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

Hvac Ac Compressor

Torque specifications for components related to the A/C Compressor system.

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Value
33 ft-lbs (44 N·m)
Important Notes
Ensure the compressor is properly aligned before tightening. Torque all bolts evenly to avoid stress.
2

A/C Line Fittings

N/A
Torque Value
5 in-lbs (0.6 N·m)
Important Notes
Hand-tighten only. Over-tightening can damage O-rings and cause leaks. Use a torque wrench set to inch pounds when possible. Estimated torque value based on typical A/C line fitting specs.
3

A/C Pressure Switch

N/A
Torque Value
5 in-lbs (0.6 N·m)
Important Notes
Hand-tighten only. Over-tightening can damage O-rings and cause leaks. Use a torque wrench set to inch pounds when possible. Estimated torque value based on typical A/C pressure switch specs.

Hvac Condenser

Torque specifications for components related to the A/C condenser.

1

A/C Condenser Mounting Bolts/Nuts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper alignment and use of any mounting bushings or hardware. Estimated torque value based on typical condenser mounting hardware.
2

A/C Receiver Drier Mounting Bolts/Nuts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper alignment and use of any mounting bushings or hardware. Estimated torque value based on typical receiver drier mounting hardware.

Hvac Evaporator

Torque specifications for components related to the A/C evaporator.

1

A/C Evaporator Core Housing Bolts/Nuts

M5 x 0.8
Torque Value
6.5 ft-lbs (9 N·m)
Important Notes
Ensure all housing components are properly aligned before tightening. Torque fasteners evenly to avoid warping. Estimated torque value based on typical evaporator housing hardware.
2

Expansion Valve Bolts/Nuts

M5 x 0.8
Torque Value
6.5 ft-lbs (9 N·m)
Important Notes
Ensure proper alignment of the expansion valve and gaskets before tightening. Torque fasteners evenly to ensure a proper seal. Estimated torque value based on typical expansion valve hardware.

Hvac Blower

Torque specifications for components related to the HVAC blower and mode door actuators.

1

HVAC Blower Motor Mounting Bolts/Screws

M4 x 0.7
Torque Value
5.5 ft-lbs (7.5 N·m)
Important Notes
Tighten fasteners evenly to prevent damage to the blower motor housing. Estimated torque value based on typical blower motor mounting hardware.
2

HVAC Mode Door Actuator Mounting Screws

M4 x 0.7
Torque Value
5.5 ft-lbs (7.5 N·m)
Important Notes
Ensure the actuator is correctly aligned to the mode door linkage before tightening. Estimated torque value based on typical actuator mounting hardware.

Hvac Heater Core

Torque specifications for components related to the heater core.

1

Heater Core Line Connection Bolts/Nuts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure proper alignment of the connections and use of new sealing washers or gaskets. Torque evenly to prevent leaks. Estimated torque value based on typical heater core connection hardware.

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 torque specifications important for HVAC components?

Proper torque ensures a secure and leak-free connection for HVAC components. Over-tightening can damage threads, deform gaskets, and potentially lead to leaks or component failure. Under-tightening can also lead to leaks and vibrations, affecting the system's performance and longevity. Using the correct torque, as specified, is vital for reliable operation.

Q2

What happens if I over-torque an HVAC bolt?

Over-torquing can strip threads, weaken bolts, and crush gaskets. In the case of an A/C compressor mounting bolt, this could cause misalignment, vibration and eventually require a more expensive repair. You should always use a torque wrench and refer to the manufacturer's specific torque for a secure and long-lasting repair.

Q3

Can I use the same torque specs for all bolts in the HVAC system?

No, you should never assume the same torque spec for all bolts in the HVAC system. Different components and bolt sizes require different torque values. For instance, the compressor mounting bolts have a different torque value than a condenser mounting bolt. Always consult the appropriate service manual or specification sheet for each component to ensure correct installation.

Q4

How often should I check the tightness of my HVAC bolts?

Generally, you should inspect the HVAC system bolts during routine maintenance, typically every 12-24 months, depending on use and environmental conditions. However, if you experience issues like unusual noises or reduced A/C performance, you should inspect sooner. After any repair work, you should also check the tightness of all bolts.

Q5

Can I reuse old bolts when working on my AC system?

While some bolts are acceptable to reuse, it is generally recommended that if you have a bolt that has been tightened to spec for a long time or has signs of corrosion it should be replaced. Many bolts will also stretch over time which makes them unsuitable for reuse. When removing and torquing bolts it is better to be safe and replace them if there is doubt.

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 1/4-inch drive torque wrench is essential for applying precise torque values to smaller HVAC fasteners.

  • Ability to measure in inch-pounds or Newton-meters
  • Click-type mechanism for accurate readings
Learn more

Torque Wrench (3/8-inch drive)

A 3/8-inch drive torque wrench is suitable for larger fasteners found in the HVAC system.

  • Wider torque range than 1/4-inch drive
  • Click-type mechanism for accurate readings
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit various bolt and nut sizes in the HVAC system.

  • Various sizes from 8mm to 14mm are common
  • Both standard and deep sockets
Learn more

Extension Bars

Extension bars help access recessed bolts and nuts within the HVAC system.

  • Various lengths for different access needs
  • Allows for proper torque application in tight spaces
Learn more

Universal Joint

A universal joint helps to reach fasteners at awkward angles.

  • Flexibility to apply torque at angles
  • Ensures proper seating of the socket
Learn more
Service Procedures

HVAC Compressor Mounting Bolt Torque

This procedure outlines how to properly torque the compressor mounting bolts.

  • Locate the compressor mounting bolts.
  • Using the appropriate socket and torque wrench, tighten each bolt in a star pattern to the specified torque of 22 ft-lbs (29 Nm).
  • Double-check the torque on each bolt.
View full procedure

HVAC Condenser Mounting Bolt Torque

This procedure outlines how to properly torque the condenser mounting bolts.

  • Locate the condenser mounting bolts.
  • Using the appropriate socket and torque wrench, tighten each bolt to the specified torque of 12 ft-lbs (16 Nm).
  • Ensure all bolts are tightened to the correct value.
View full procedure

HVAC Evaporator Core Housing Bolt Torque

This procedure outlines how to properly torque the evaporator core housing bolts.

  • Locate the evaporator core housing bolts.
  • Using the appropriate socket and torque wrench, tighten each bolt to the specified torque of 8 ft-lbs (11 Nm).
  • Verify proper torque on all fasteners.
View full procedure

HVAC Line Connector Torque

This procedure outlines how to properly torque the HVAC line connectors.

  • Locate the HVAC line connectors.
  • Using the appropriate size wrench and torque wrench adapter (if necessary) tighten the connector to the specified torque of 18 ft-lbs (24 Nm).
  • Double-check the torque on each connector.
View full procedure
Technical Service Bulletins

HVAC Compressor Mounting Bolt Loosening

2012-05-15

Some 2009-2012 Acura TSX models may experience HVAC compressor mounting bolts loosening over time. This can lead to compressor noise and reduced system performance.

2009-2012

Resolution: Inspect the compressor mounting bolts and re-torque to 22 ft-lbs (29 Nm). Apply a thread-locking compound if loosening is a recurring issue.

HVAC Condenser Mounting Bracket Corrosion

2013-11-20

Certain 2011-2014 Acura TSX models operating in areas with high road salt exposure may develop corrosion on the condenser mounting bracket and fasteners. This can compromise structural integrity.

2011-2014

Resolution: Inspect the condenser mounting bracket and fasteners for corrosion. Replace corroded parts. Ensure correct torque is applied upon reinstallation (12 ft-lbs or 16 Nm). Apply anti-seize to all fasteners.

HVAC Line Connector Leakage

2014-03-01

Some 2010-2014 Acura TSX vehicles may experience refrigerant leaks at the HVAC line connectors due to improper sealing. Proper torque is critical to prevent this.

2010-2014

Resolution: Inspect the HVAC line connectors for leaks. If leaks are present, replace the O-rings and torque the connector to 18 ft-lbs (24 Nm) using proper procedures. Verify the seal after installation.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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