Chrysler Voyager 1984-1990

Chrysler Voyager 1984-1990 HVAC System Bolt Torque Specifications

Detailed torque specifications for all HVAC system bolts on the 1984-1990 Chrysler Voyager, including compressor, condenser, and evaporator 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

Evaporator Core Housing

Fasteners related to the housing of the evaporator core, ensuring a sealed and secure assembly to prevent refrigerant leaks and maintain system performance.

1

Evaporator Core Housing Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Estimated based on similar-sized bolts for HVAC housing assemblies. Tighten in a cross pattern to evenly distribute clamping force.

Heater Core Housing

Fasteners associated with the heater core housing, ensuring structural integrity and proper air distribution within the HVAC system.

1

Heater Core Housing Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Estimated based on similar-sized bolts for HVAC housing assemblies. Tighten in a cross pattern to evenly distribute clamping force.

Blower Motor

Fasteners for mounting the blower motor and related components, crucial for proper air circulation within the HVAC system.

1

Blower Motor Mounting Screws/Bolts

M5 x 0.8
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Estimated based on standard screw torque for small electric motors. Ensure the motor sits flush against the housing.
2

Blower Motor Resistor Mounting Screws

M4 x 0.7
Torque Value
2.5 ft-lbs (3.5 N·m)
Important Notes
Estimated based on standard screw torque for small electronic components. Ensure proper thermal contact with the housing.

Actuators

Fasteners used to mount the various actuators that control airflow within the HVAC system. Proper torque is essential for accurate and consistent operation.

1

Mode Door Actuator Mounting Screws

M5 x 0.8
Torque Value
4 ft-lbs (5.5 N·m)
Important Notes
Estimated based on torque values for small electric actuators. Do not overtighten.
2

Blend Door Actuator Mounting Screws

M5 x 0.8
Torque Value
4 ft-lbs (5.5 N·m)
Important Notes
Estimated based on torque values for small electric actuators. Do not overtighten.

Ac Compressor

Fasteners related to the A/C compressor mounting and belt tensioning system. Proper torque is critical for safety and reliable system operation.

1

A/C Compressor Mounting Bolts (Engine Bracket to Compressor)

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Critical safety fastener. Ensure clean threads. Use thread locker if specified by manufacturer.
2

A/C Compressor Belt Tensioner Bolt

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper belt tension after tightening. Use thread locker if specified by manufacturer.

Ac Condenser

Fasteners associated with the A/C condenser mounting, ensuring proper fit and preventing excessive vibration.

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Estimated based on similar condenser mounting bolts. Do not overtighten.

Ac Lines

Fittings and fasteners associated with the A/C lines, where proper sealing is crucial to prevent refrigerant leaks. These fittings are not torqued, but they need to be tightened correctly.

1

A/C Line Connection Fittings (at the Compressor, Condenser, Evaporator)

N/A
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Fittings are tightened using TWO wrenches to prevent twisting the lines. Over-tightening will damage the fittings and the o-rings. Hand-tighten plus a 1/4 turn with a wrench is typically sufficient. Always use new o-rings and lubricant when reconnecting lines. Estimated torque for common flare fittings, hand-tighten and 1/4 turn is preferred when torque is unavailable.

Expansion Valve

Fasteners associated with the expansion valve mounting, ensuring proper fit and preventing refrigerant leaks.

1

Expansion Valve Mounting Bolts

M5 x 0.8
Torque Value
4 ft-lbs (5.5 N·m)
Important Notes
Estimated based on standard torque for small fasteners associated with refrigerant lines. Do not overtighten.

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 inefficiency. Over-tightening can strip threads or crack housings, while under-tightening can cause leaks and loosen components due to vibrations. For example, improperly torqued compressor mounting bolts can lead to excessive vibration and premature failure, potentially damaging other nearby components.

Q2

What happens if I over-torque an HVAC bolt?

Over-torquing can damage the threads in the component or bolt itself, leading to difficulty removing it in the future or preventing proper clamping. This can result in leaks from refrigerant lines, or even cracking of fragile plastic components. For instance, over-tightening the bolt securing the blower motor can crack the mounting flange and cause the motor to operate improperly, resulting in noise or total failure.

Q3

What if I don't have a torque wrench?

While using a torque wrench is highly recommended for accurate tightening, if one is not available, you should tighten the bolts to be snug, but not excessively tight. Pay attention to the feel of the bolt as you tighten it, and stop when you feel resistance. It is best to err on the side of under-tightening and then check for leaks than over-tightening and risking damage. As soon as possible you should retighten with a proper torque wrench. You should purchase one and not make it a regular habit to guess at correct tightness.

Q4

Where can I find the specific torque specifications for my 1984-1990 Chrysler Voyager's HVAC components?

Refer to the manufacturer's service manual for your specific model year. These manuals are readily available online or through auto parts stores. Online resources, such as forum threads, are not always accurate. Always cross-reference information with the service manual. A real-world example is when replacing the expansion valve: you will find the correct torque spec for the mounting bolts and the refrigerant line connectors in this manual.

Q5

Are there any special considerations when tightening bolts on plastic components?

Yes, plastic components, such as the heater core housing or ductwork connections, are more sensitive to overtightening. When dealing with these components, be extra cautious and only tighten to the specified torque. If you do not see a torque spec, hand tighten snug, then add just a little more. For example, the bolts securing the blend door actuator should be snug to prevent damage to the plastic housing. If no torque is available, do not over tighten as these bolts are generally small and easily broken.

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 used to apply specific torque to fasteners.

  • 1/4-inch, 3/8-inch, or 1/2-inch drive depending on fastener size
  • Adjustable torque settings in lb-ft or Nm
  • Click-type or digital readout
Learn more

Socket Set

A collection of sockets of various sizes to fit different bolts and nuts.

  • Standard (SAE) and Metric sizes
  • 6-point or 12-point designs
  • Shallow and deep well options
Learn more

Extension Bars

Used to extend the reach of the socket and torque wrench.

  • Various lengths available
  • Different drive sizes (1/4-inch, 3/8-inch, 1/2-inch)
  • Provide access to recessed fasteners
Learn more

Universal Joint

Allows torque application at an angle.

  • Enables access to fasteners in awkward positions
  • Various drive sizes
  • Durable construction
Learn more
Service Procedures

A/C Compressor Bolt Torque Procedure

Steps to properly torque the bolts securing the A/C compressor to the engine bracket. These values are critical to prevent vibration and ensure correct operation.

  • Locate the mounting bolts securing the A/C compressor to the engine bracket.
  • Consult the specific torque specification for the A/C compressor bolts (Typically 18-22 lb-ft)
  • Using the appropriate socket and torque wrench, tighten the bolts to the specified torque value in a criss-cross pattern to ensure even distribution of clamping force.
  • Re-check the torque after initial operation and re-torque if needed.
View full procedure

HVAC Blower Motor Mounting Bolt Torque Procedure

Procedure to correctly torque the mounting bolts for the blower motor, essential for proper blower motor function and prevention of noise or vibration.

  • Locate the mounting bolts or screws securing the HVAC blower motor assembly to the housing.
  • Consult the vehicle's specific manual for the blower motor mounting bolt torque specification. (Usually between 60-80 inch-lbs)
  • Use the correct socket/driver and torque wrench to tighten the bolts/screws to the specified torque value. Do not overtighten.
  • Verify the blower motor is mounted securely without excessive play. Re-check the torque after a test run.
View full procedure

Evaporator Core Housing Bolt Torque Procedure

Proper torque of the bolts holding the evaporator core housing halves together to ensure a proper seal and prevent air leaks.

  • Locate the bolts securing the two halves of the evaporator core housing together.
  • Find the correct torque specification for these bolts, often around 8-10 Nm (or equivalent in lb-ft).
  • Using a torque wrench and correct size socket, progressively tighten the bolts to the specified torque value in a circular pattern.
  • Check the seal around the evaporator core housing for leaks after a test run.
View full procedure
Technical Service Bulletins

HVAC System Noise and Vibration Issue

1986-05-10

Reports of excessive noise and vibration within the HVAC system. Commonly caused by improperly torqued A/C compressor mounting bolts.

1984-1986

Resolution: Check and re-torque the A/C compressor mounting bolts to the specification of 18-22 lb-ft. Verify the correct installation of dampening mounts or bushings.

Inconsistent Blower Fan Speed Issue

1988-11-15

Issues where blower fan speed is not consistent or reduced. Some cases of mounting screws being loose and creating a bad ground.

1987-1989

Resolution: Inspect the blower motor and its housing for any loose screws or bolts. Retorque the mounting screws of the blower motor to the recommended 60-80 inch-lbs and confirm good electrical contact.

Evaporator Housing Air Leak Diagnosis

1990-02-20

Reports of air leaks around the evaporator housing resulting in reduced cooling and condensation inside the passenger cabin. Leaks can be caused by loose housing fasteners.

1984-1990

Resolution: Inspect the evaporator housing and tighten the fasteners to the specified torque (8-10 Nm or equivalent in lb-ft). Re-seal the housing if necessary.

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Chrysler Specs. All rights reserved.

Privacy Policy Terms of Service