Chrysler Concorde 1998-2004 HVAC System Bolt Torque Specifications
Chrysler Concorde 1998-2004

Chrysler Concorde 1998-2004 HVAC System Bolt Torque Specifications

This page provides a comprehensive list of bolt torque specifications for various HVAC components on the 1998-2004 Chrysler Concorde. Includes torque values for compressor, condenser, evaporator, and related hardware.

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

Components related to the A/C compressor mounting and connections.

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure the compressor is properly aligned before tightening. Use a cross-tightening pattern. Use new hardware where needed.
2

A/C Line Fittings

Varies based on fitting type - Use appropriate wrench and torque spec for each specific fitting. Sizes typically range from M8 x 1.25 to M16 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Use new O-rings and lubricate with refrigerant oil. Be careful not to over-tighten. This is an estimated average torque; refer to specific fitting specs when available.

Ac Condenser

Components related to the A/C condenser mounting.

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Value
8.75 ft-lbs (12 N·m)
Important Notes
Ensure condenser is properly aligned on mounting points. This is an estimated value based on similar size bolts.

Ac Evaporator

Components related to the A/C evaporator core mounting within the HVAC housing.

1

A/C Evaporator Core Mounting Bolts/Screws

M5 x 0.8
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Be careful not to over-tighten as the housing is typically made of plastic. This is an estimated value based on similar sized screws.

Hvac Blower

Components related to the HVAC blower motor mounting.

1

HVAC Blower Motor Mounting Screws

M4 x 0.7
Torque Value
4.2 ft-lbs (6 N·m)
Important Notes
Avoid over-tightening to prevent damage to the plastic housing. This is an estimated value for small screws securing the blower motor.

Hvac Housing

Components related to mounting the entire HVAC housing assembly.

1

HVAC Housing Assembly Mounting Bolts

M6 x 1.0
Torque Value
8.75 ft-lbs (12 N·m)
Important Notes
Ensure the housing is properly seated before tightening. This is an estimated value for mounting bolts of a non-critical system.

Heater Core

Components related to the heater core connections to the engine coolant system.

1

Heater Core Pipe Connection Bolts/Nuts

M6 x 1.0
Torque Value
8.75 ft-lbs (12 N·m)
Important Notes
Ensure proper alignment of the pipes and new seals are used. This is an estimated value, check for specific part torque if available.

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 bolts?

Correct torque ensures proper clamping force, preventing leaks, component damage, and system malfunctions. Overtightening can strip threads or crack housings, while undertightening can lead to leaks and vibrations. For example, an under-torqued compressor bolt could cause the compressor to vibrate excessively, reducing its lifespan, and potentially causing refrigerant leaks.

Q2

What happens if I overtighten an HVAC component bolt?

Overtightening can damage the component by stripping threads, cracking plastic housings, or deforming gaskets. This can lead to leaks, component failure, and costly repairs. For instance, overtightening an expansion valve bolt could damage the valve itself, requiring its replacement and system evacuation.

Q3

What if I don't have a torque wrench?

While using a torque wrench is highly recommended for accuracy, if one isn't available, you must use extreme caution. Tighten fasteners snugly but avoid excessive force. When in doubt, it's better to slightly under-tighten and double check later rather than overtighten. It's highly recommended to purchase or borrow a torque wrench to avoid damaging components.

Q4

Are there specific torque specs for different HVAC components?

Yes, different components require different torque specifications based on their material, size, and function. For example, compressor mounting bolts typically have higher torque specs than control module screws. Refer to the repair manual for the specific values for the Chrysler Concorde model you are working on.

Q5

How often should I inspect and tighten HVAC bolts?

Regular inspection is advisable, ideally during routine vehicle maintenance (e.g., oil changes). However, if you've recently serviced the HVAC system or experienced unusual vibrations or noises, inspect all HVAC-related bolts immediately. For example, after replacing the compressor, you should recheck the mounting bolt torque after a few days or a few hundred miles.

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

A calibrated torque wrench is essential for accurately tightening bolts to the specified torque values, preventing damage and ensuring secure connections.

  • Various drive sizes (1/4", 3/8", 1/2")
  • Adjustable torque settings
  • Click or digital readout for accurate torque application
Learn more

Socket Set

A comprehensive socket set, including standard and metric sizes, is required to fit the various bolt heads used in the HVAC system of the Chrysler Concorde.

  • Variety of socket sizes
  • Deep and shallow sockets
  • 6-point and 12-point options
Learn more

Extension Bars

Extension bars of various lengths are useful for reaching bolts in tight or hard-to-access areas of the HVAC system.

  • Various lengths
  • Compatible with socket sets
  • Durable construction
Learn more
Service Procedures

Compressor Mounting Bolt Torque

Procedure for tightening the bolts that secure the AC compressor to the engine block. Proper torque is crucial to prevent vibration and premature failure.

  • Locate the compressor mounting bolts.
  • Using the appropriate socket, hand tighten each bolt.
  • Tighten the bolts to the specified torque value using a torque wrench.
  • Double check all bolts to confirm proper torque
View full procedure

Condenser Mounting Bolt Torque

Procedure for tightening the bolts that secure the condenser to the radiator support or chassis. Proper torque is crucial for secure mounting.

  • Locate the condenser mounting bolts.
  • Using the appropriate socket, hand tighten each bolt.
  • Tighten the bolts to the specified torque value using a torque wrench.
  • Double check all bolts to confirm proper torque
View full procedure

Evaporator Core Mounting Bolt Torque

Procedure for tightening the bolts that secure the evaporator core housing. Proper torque prevents leaks and secures the unit correctly.

  • Locate the evaporator core mounting bolts.
  • Using the appropriate socket, hand tighten each bolt.
  • Tighten the bolts to the specified torque value using a torque wrench.
  • Double check all bolts to confirm proper torque
View full procedure
Technical Service Bulletins

HVAC System Bolt Torque Specification Update

2001-05-15

A technical bulletin released to update torque specifications for certain HVAC components due to reported failures related to over/under tightening of fasteners.

1998-2001

Resolution: Refer to the revised torque specification chart included with this bulletin. Ensure all fasteners are torqued to the new values. Replace any damaged bolts.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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