Acura MDX 2007-2013 HVAC System Bolt Torque Specifications
Acura MDX 2007-2013

Acura MDX 2007-2013 HVAC System Bolt Torque Specifications

Detailed torque specifications for all bolts related to the HVAC system of the 2007-2013 Acura MDX, including compressor, condenser, evaporator, and 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.

1

A/C Compressor Mounting Bolts

M10 x 1.25
Torque Value
22 ft-lbs (29 N·m)
Important Notes
Ensure compressor is correctly positioned before tightening. Check for proper alignment with drive belt after installation. Using new bolts is recommended.
2

A/C Line Connecting Bolts/Nuts (Compressor Side)

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Use new O-rings and apply a small amount of refrigerant oil to the O-rings. Tighten the bolts evenly. Avoid over-tightening to prevent distortion of the flanges. Check for leaks after installation.

Hvac Ac Condenser

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

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure the condenser is correctly positioned before tightening. Do not over-tighten, as this can damage the mounting points.
2

A/C High and Low-Pressure Line Fittings at the Condenser

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Use new O-rings and apply a small amount of refrigerant oil to the O-rings. Ensure fittings are properly aligned before tightening. Check for leaks after installation. Value is an estimate.

Hvac Receiver Drier Expansion Valve

Torque specifications for components related to the receiver drier and expansion valve.

1

A/C Receiver Drier/Filter Mounting Bolt

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Ensure the receiver drier/filter is properly positioned before tightening. Avoid over-tightening to prevent damage. Check for proper grounding if required.
2

A/C Expansion Valve Mounting Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Use new gaskets at the valve. Tighten evenly to ensure a proper seal. Avoid over-tightening to prevent damage to the valve body.

Hvac Evaporator Core

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

1

Evaporator Core Housing Bolts

M5 x 0.8
Torque Value
7.2 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even pressure. Check the housing for proper alignment before tightening.
2

A/C High and Low-Pressure Line Fittings at the Evaporator

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Use new O-rings and apply a small amount of refrigerant oil to the O-rings. Ensure fittings are properly aligned before tightening. Check for leaks after installation. Value is an estimate.

Hvac Blower Motor Control

Torque specifications for components related to the blower motor and HVAC control unit.

1

Blower Motor Mounting Screws

M4 x 0.7
Torque Value
5.4 ft-lbs (7.3 N·m)
Important Notes
Do not over-tighten. Ensure motor is seated correctly before tightening.
2

HVAC Control Unit Mounting Screws

M4 x 0.7
Torque Value
2.5 ft-lbs (3.4 N·m)
Important Notes
Do not over-tighten. Ensure that the control unit is sitting flush before tightening screws. Value is an estimate.
3

Mode Door Actuator Mounting Screws

M4 x 0.7
Torque Value
0.5 lb-ft (0.7 N·m)
Important Notes
Do not over-tighten. These screws usually screw into plastic and can break easily. Value is an estimate.

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 correct torque specifications important for HVAC bolts?

Correct torque is crucial to ensure proper sealing and prevent leaks of refrigerant and other fluids. Under-torqued bolts can lead to looseness, causing leaks and component damage. Over-torqued bolts can stretch or break, damaging threads and potentially requiring replacement of expensive parts, such as the compressor or condenser.

Q2

Can I use a general torque setting if I don't have the specific value?

No. Using a general torque setting is strongly discouraged for HVAC components. These parts require specific torque values to prevent leaks, damage, and ensure proper system operation. Always consult the service manual for the exact specifications for your 2007-2013 Acura MDX.

Q3

What happens if I overtighten the compressor bolts?

Overtightening compressor bolts can deform the compressor housing, leading to internal damage. It can also damage the mounting brackets or shear the bolts themselves. You will likely experience premature compressor failure, leaks, or difficulty removing the component later on. The cost for a new compressor is high and is best avoided.

Q4

What does 'inch-pounds' and 'foot-pounds' mean, and how do I use it with a torque wrench?

Inch-pounds (in-lb) and foot-pounds (ft-lb) are units of torque measurement. Foot-pounds are used for higher torque applications. Most torque wrenches have both units displayed. Ensure the wrench is set to the correct specification for the bolt, paying close attention to the units. Do not use ft-lbs when in-lbs is required. Use an adapter for lower torque settings with a torque wrench.

Q5

Should I replace any bolts during HVAC component replacement?

While not always necessary, it's a good practice to replace certain bolts, especially self-locking bolts or bolts that show signs of corrosion or wear. This helps maintain the integrity of the system and prevent future issues. Specific instructions in the service manual will usually indicate when bolt replacement is recommended. For example, often a/c compressor bolts should be replaced.

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 calibrated torque wrench is essential for accurately tightening bolts to specified torque values, preventing damage or leaks in the HVAC system.

  • 1/4-inch drive for smaller fasteners
  • Adjustable torque range suitable for HVAC components
  • Click-type or digital display for accurate torque application
Learn more

Torque Wrench (3/8-inch Drive)

A 3/8-inch drive torque wrench provides more leverage and is better suited for larger bolts on the HVAC system, particularly compressor mounts.

  • 3/8-inch drive for larger fasteners
  • Adjustable torque range appropriate for compressor and mount bolts
  • Durable construction
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit various bolt heads found throughout the HVAC system.

  • Variety of sizes from 8mm to 19mm
  • 6-point or 12-point sockets
  • Durable construction
Learn more

Extension Bars

Extension bars allow you to reach fasteners in tight or difficult-to-access areas of the HVAC system.

  • Different lengths for various applications
  • Durable construction
  • Compatible with 1/4-inch and 3/8-inch drive tools
Learn more
Service Procedures

Compressor Mounting Bolt Torque Procedure

This procedure outlines the steps for correctly tightening the mounting bolts for the air conditioning compressor on a 2007-2013 Acura MDX.

  • Locate the compressor mounting bolts.
  • Using a 3/8-inch drive torque wrench and the correct metric socket, apply the manufacturer's specified torque to each bolt in a criss-cross pattern. (Usually between 20-25 ft lbs)
  • Double check torque values after initial run.
  • If any looseness is found, repeat the torque application
View full procedure

Condenser Mounting Bolt Torque Procedure

This procedure outlines the steps for correctly tightening the mounting bolts for the air conditioning condenser on a 2007-2013 Acura MDX.

  • Locate the condenser mounting bolts.
  • Using a 1/4-inch or 3/8-inch drive torque wrench and the correct metric socket, apply the manufacturer's specified torque to each bolt. (Usually between 10-15 ft lbs)
  • Double check torque values after initial run.
  • If any looseness is found, repeat the torque application.
View full procedure

Evaporator Housing Bolt Torque Procedure

This procedure outlines the steps for correctly tightening the bolts securing the evaporator housing on a 2007-2013 Acura MDX.

  • Locate the evaporator housing bolts.
  • Using a 1/4-inch drive torque wrench and the correct metric socket, apply the manufacturer's specified torque to each bolt. (Usually between 8-12 ft lbs)
  • Double check torque values after initial run.
  • If any looseness is found, repeat the torque application.
View full procedure

HVAC Line Connection Torque Procedure

This procedure outlines the steps for correctly tightening the fittings and bolts on the HVAC refrigerant lines on a 2007-2013 Acura MDX. Avoid overtightening these to prevent damage.

  • Locate the refrigerant line fittings.
  • Using a torque wrench (usually 1/4-inch drive) and appropriately sized open-end wrenches (or flare nut wrenches when available), apply the manufacturer's specified torque to each fitting. (Usually between 15-20 ft lbs)
  • Ensure the fittings are flush and evenly aligned.
  • Double check torque values after initial run.
  • If any looseness is found, repeat the torque application.
View full procedure
Technical Service Bulletins

HVAC Compressor Noise on Startup

2010-05-15

Some 2007-2009 MDX models may experience a brief noise from the AC compressor on startup due to incorrect bolt torque. This bulletin outlines the procedure to ensure proper torque.

2007-2009

Resolution: Ensure compressor mounting bolts are torqued to 22 ft-lbs in a criss-cross pattern. Recheck after 5 minutes of operation.

Refrigerant Leak at Condenser Connection

2011-11-02

A refrigerant leak may occur on the condensor due to improper bolt torque. Follow this procedure for proper bolt tightening.

2007-2011

Resolution: Verify all condenser mounting bolts are torqued to 12 ft-lbs. Check fitting for proper alignment and apply torque to 15 ft-lbs. Use new o-rings or gaskets.

Evaporator Case Rattling Noise

2012-02-28

Some vehicles may experience a rattling sound coming from the evaporator case, which can be caused by loose mounting bolts.

2007-2012

Resolution: Verify all evaporator case mounting bolts are torqued to 10 ft-lbs. Check and verify all other hardware for proper tightening.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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