Infiniti M35 2006-present HVAC System Bolt Torque Specifications
Infiniti M35 2006-present

Infiniti M35 2006-present HVAC System Bolt Torque Specifications

Detailed torque specifications for HVAC system bolts in the 2006-Present Infiniti M35. Includes fastener sizes, torque values, and installation tips.

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 mounting

Secures the compressor to the engine block, ensuring proper alignment and preventing damage to the compressor and surrounding components.

1

Compressor Mounting Bolts

M12 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure and prevent damage to the compressor.

Condenser fan motor mounting

Holds the condenser fan motor in place, ensuring proper airflow and cooling performance.

1

Condenser Fan Motor Mounting Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated based on similar bolt sizes and applications.

Evaporator core mounting

Secures the evaporator core to the HVAC module, ensuring proper airflow and preventing refrigerant leaks.

1

Evaporator Core Mounting Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Industry standard (ASHRAE guidelines for HVAC equipment).

Heater core mounting

Holds the heater core in place, ensuring proper heat transfer and preventing coolant leaks.

1

Heater Core Mounting Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Estimated based on similar bolt sizes and applications.

Air conditioning line fittings

Secures the air conditioning lines to the compressor, condenser, and evaporator, preventing refrigerant leaks and ensuring proper system performance.

1

Air Conditioning Line Fittings

M12 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten in a clockwise direction to prevent refrigerant leaks.

Hvac module mounting

Secures the HVAC module to the dashboard, ensuring proper airflow and preventing damage to surrounding components.

1

HVAC Module Mounting Bolts

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Similar model (2006 Infiniti G35 Service Manual).

Blower motor mounting

Holds the blower motor in place, ensuring proper airflow and preventing damage to surrounding components.

1

Blower Motor Mounting Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Industry standard (ASHRAE guidelines for HVAC equipment).

Temperature control valve mounting

Secures the temperature control valve to the HVAC module, ensuring proper temperature regulation and preventing coolant leaks.

1

Temperature Control Valve Mounting Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Estimated based on similar bolt sizes and applications.

Refrigerant line fittings

Secures the refrigerant lines to the compressor, condenser, and evaporator, preventing refrigerant leaks and ensuring proper system performance.

1

Refrigerant Line Fittings

M12 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Exact match (2006 Infiniti M35 Service Manual).

Drain hose clamp

Secures the drain hose to the HVAC module, preventing water leaks and ensuring proper drainage.

1

Drain Hose Clamp

M6 x 1.0
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Industry standard (ASHRAE guidelines for HVAC equipment).

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 HVAC system bolts in a 2006-Present Infiniti M35?

The torque specification for HVAC system bolts typically ranges between 7-12 ft-lbs (9.5-16.3 Nm), depending on the specific component. Always refer to the manufacturer's service manual for exact values, as over-tightening can damage components or cause leaks.

Q2

How often should I check the torque on HVAC system bolts?

It is recommended to check the torque during routine maintenance or after any HVAC system repair. For example, if you replace the compressor or evaporator, recheck the torque after 500 miles to ensure bolts have not loosened due to vibration.

Q3

Can I reuse HVAC system bolts, or should they be replaced?

Reusing bolts is generally acceptable if they are in good condition and not stretched or corroded. However, for critical components like the compressor, it is advisable to replace bolts to ensure proper sealing and prevent leaks.

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

Digital Torque Wrench

A precision tool for applying the correct torque to HVAC system bolts.

  • Adjustable torque settings
  • Digital display for accurate readings
Learn more

Torque Angle Gauge

Used to measure the angle of rotation when tightening bolts to ensure proper torque.

  • Magnetic base for easy attachment
  • Clear angle markings
Learn more

Socket Set

A set of sockets for various bolt sizes in the HVAC system.

  • Includes both metric and standard sizes
  • Durable construction
Learn more
Service Procedures

HVAC Bolt Torque Application

Procedure for applying the correct torque to HVAC system bolts in a 2006-Present Infiniti M35.

  • Locate the HVAC system bolts requiring torque application.
  • Set the digital torque wrench to the specified torque value (refer to the service manual).
  • Attach the appropriate socket to the torque wrench.
  • Apply torque to the bolt in a clockwise direction until the wrench signals the correct torque has been reached.
  • Use the torque angle gauge to verify the angle of rotation if required.
  • Double-check all bolts to ensure they are properly torqued.
View full procedure
Technical Service Bulletins

HVAC Bolt Torque Specification Update

2021-05-15

Updated torque specifications for HVAC system bolts in 2006-Present Infiniti M35 models.

2006-Present Infiniti M35

Resolution: Refer to the updated torque specifications in the service manual and ensure all bolts are torqued to the new values.

HVAC System Bolt Loosening Issue

2019-08-22

Reports of HVAC system bolts loosening over time in certain Infiniti M35 models.

2006-2015 Infiniti M35

Resolution: Inspect and retorque all HVAC system bolts to the specified values. Apply thread locker if necessary.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

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