Chrysler Concorde 1993-1997 HVAC System Bolt Torque Specifications
Chrysler Concorde 1993-1997

Chrysler Concorde 1993-1997 HVAC System Bolt Torque Specifications

This page provides detailed torque specifications for bolts related to the Heating, Ventilation, and Air Conditioning (HVAC) system of the 1993-1997 Chrysler Concorde. Includes specifications for compressor, condenser, evaporator, and other relevant 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

Ac Compressor

Fasteners securing the A/C compressor to the engine mounting bracket. Proper torque is crucial for compressor alignment, preventing vibration, and avoiding premature failure.

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure bolts are evenly tightened. Use a cross-tightening pattern to ensure the compressor is flush against the mounting bracket.

Ac Lines

Fittings that connect A/C lines to various system components. Proper tightening prevents leaks and damage to the O-rings.

1

A/C Line Fittings

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Tighten only by hand until snug, do not over-tighten. These are typically flare or o-ring fittings that require minimal torque to seal properly. Over-tightening can damage the o-ring and cause leaks.

Ac Condenser

Bolts securing the A/C condenser to the radiator support or vehicle frame. Proper torque ensures secure mounting and prevents vibrations.

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Estimated value. Ensure bolts are evenly tightened. Do not over-tighten, as condenser brackets can be easily damaged.

Ac Evaporator

Fasteners holding the A/C evaporator core housing together. Proper torque prevents air leaks and damage to the housing.

1

A/C Evaporator Core Housing Bolts/Screws

M5 x 0.8
Torque Value
5.9 ft-lbs (8 N·m)
Important Notes
Estimated value. These are typically screws that thread into plastic. Do not over-tighten to avoid cracking the housing.

Ac Expansion Valve

Bolts or screws that attach the A/C expansion valve to the evaporator core or lines. Proper torque ensures a secure seal and prevents refrigerant leaks.

1

A/C Expansion Valve Mounting Bolts/Screws

M5 x 0.8
Torque Value
5.9 ft-lbs (8 N·m)
Important Notes
Estimated value. Ensure the valve is properly seated before tightening. Do not over-tighten to avoid deforming the valve.

Blower Motor

Fasteners that secure the blower motor to the HVAC housing. Proper torque prevents vibrations and ensures proper alignment.

1

Blower Motor Mounting Bolts/Screws

M5 x 0.8
Torque Value
4.4 ft-lbs (6 N·m)
Important Notes
Estimated value. Typically self-tapping screws into plastic. Do not over-tighten to avoid stripping the threads.

Hvac Control Panel

Screws or small bolts that secure the HVAC control panel to the dashboard. Proper torque prevents vibration and damage to the panel.

1

HVAC Control Panel Mounting Screws/Bolts

M4 x 0.7
Torque Value
2.2 ft-lbs (3 N·m)
Important Notes
Estimated value. These are typically small self-tapping screws. Over-tightening can damage the plastic panel.

Heater Core Pipes

Clamps securing the heater core inlet/outlet pipes. Correct tightening prevents leaks and damage to hoses.

1

Heater Core Inlet/Outlet Pipe Clamps

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Tighten hose clamps firmly by hand. Do not over-tighten, as this can damage the hoses or fittings. Use a clamp plier to tighten correctly.

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 it important to use the correct torque specifications?

Using the correct torque specifications ensures a secure and leak-free connection. Over-tightening can damage components like the compressor housing or evaporator fittings, leading to cracks, leaks, and premature failure. Under-tightening can also result in leaks and component loosening due to vibration, potentially causing further damage or performance issues. For example, over tightening a compressor clutch bolt can damage the clutch bearing and potentially cause the clutch to not engage or disengage properly.

Q2

Where can I find the correct torque specifications for my 1993-1997 Chrysler Concorde HVAC system?

The most reliable sources for torque specifications are the official Chrysler service manuals for the 1993-1997 Concorde. These manuals provide detailed diagrams and specific torque values for each bolt in the HVAC system. Aftermarket repair manuals from brands like Haynes or Chilton may also include these specs. If you do not have access to a manual, researching online forums dedicated to this vehicle make and model can provide guidance, but always verify information from multiple sources.

Q3

What should I do if I don't have a torque wrench?

While a torque wrench is highly recommended for precision, you can use a hand wrench carefully. Tighten bolts gradually and in a cross pattern to avoid uneven pressure. Instead of using maximum strength, tighten gradually until the bolt is snug, then a small amount past that. If a bolt feels like it is starting to bind, STOP and verify the tightness of the bolt next to it in the pattern. When removing bolts, you should use the same cross pattern and gradually loosen the bolts a small amount each pass. It is advised to have a professional install the HVAC if you are unsure as overtightening/undertightening can cause damage. Always invest in a torque wrench for accurate tightening, especially for critical components like the compressor and accumulator.

Q4

What are common symptoms of improperly torqued HVAC bolts?

Common symptoms include refrigerant leaks (identified by oily residue near connections), unusual noises such as hissing or rattling, reduced AC performance, and premature component failure. A loose compressor mounting bolt, for example, could cause excessive vibration and noise. If a bolt has been overtightened it can break, which could cause immediate problems and could cause long term failure of the component due to it no longer being properly attached.

Q5

Can I reuse old HVAC bolts?

It's generally recommended to replace bolts, especially those that seal components or carry high loads. Old bolts can be stretched or corroded, affecting their clamping force and potential torque value. Additionally, many components, such as the evaporator core, utilize o-rings and it may be necessary to replace them when reinstalling the component. This can help prevent leaks. Always consult the specific manual for your model and application.

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 wrench for applying specific torque values to fasteners.

  • Adjustable torque settings
  • Click or digital readout
  • Variety of drive sizes (1/4", 3/8", 1/2")
Learn more

Socket Set

A set of sockets in various sizes to fit the bolts and nuts on the HVAC system.

  • Metric and/or Standard sizes
  • Different drive sizes
  • Variety of socket types (standard, deep well)
Learn more

Extension Bars

Used to reach fasteners in recessed or hard-to-access areas.

  • Various lengths
  • Multiple drive sizes
  • Wobble and solid options
Learn more
Service Procedures

A/C Compressor Bolt Torque Check

Procedure for checking and adjusting torque on the A/C compressor mounting bolts.

  • Locate the A/C compressor mounting bolts.
  • Consult the correct torque specification for your model year (1993-1997 Chrysler Concorde).
  • Set the torque wrench to the specified value.
  • Tighten or check each bolt to the correct torque value in the correct sequence if one is given.
View full procedure

Condenser Mounting Bolt Torque Check

Procedure for checking and adjusting torque on the Condenser mounting bolts.

  • Locate the condenser mounting bolts.
  • Consult the correct torque specification for your model year (1993-1997 Chrysler Concorde).
  • Set the torque wrench to the specified value.
  • Tighten or check each bolt to the correct torque value in the correct sequence if one is given.
View full procedure

Evaporator Core Housing Bolt Torque Check

Procedure for checking and adjusting torque on the evaporator core housing bolts.

  • Locate the evaporator core housing bolts.
  • Consult the correct torque specification for your model year (1993-1997 Chrysler Concorde).
  • Set the torque wrench to the specified value.
  • Tighten or check each bolt to the correct torque value in the correct sequence if one is given.
View full procedure
Technical Service Bulletins

A/C Compressor Mounting Bolt Failure

1996-05-15

Some vehicles have reported A/C compressor mounting bolts loosening or failing over time. Correct torque spec and bolt condition should be checked.

1993-1996 Chrysler Concorde

Resolution: Verify correct torque specification for model year and check for bolt stretch or fatigue. Replace bolts if necessary.

HVAC control panel mounting bolt failure

1994-02-22

Some vehicles have reported control panel mounting bolts loosening or failing over time. Correct torque spec and bolt condition should be checked.

1993-1994 Chrysler Concorde

Resolution: Verify correct torque specification for model year and check for bolt stretch or fatigue. Replace bolts if necessary.

About the Author

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