Cadillac DTS 2006-2011 HVAC System Bolt Torque Specifications
Cadillac DTS 2006-2011

Cadillac DTS 2006-2011 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 2006-2011 Cadillac DTS. Includes condenser, compressor, evaporator, and other relevant component fasteners.

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

Specifications for mounting the A/C compressor to the engine bracket. Proper torque is crucial for alignment, vibration control, and component longevity.

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure bolts are tightened evenly. A calibrated torque wrench is essential.

Ac Line Fittings

Torque specifications for A/C line fittings. These fittings rely on O-rings for sealing. Overtightening can cause leaks or damage.

1

A/C Line Fittings

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Tighten by hand only. Do not use a wrench, as these do not require specific torque values. Over-tightening can cause damage. The correct sealing relies on the O-rings.

Ac Condenser

Specifications for mounting the A/C condenser. These mounts are relatively light and the torque will be minimal. It is important to torque these properly so that the condenser does not shake and vibrate.

1

A/C Condenser Mounting Bolts/Screws

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value based on common mounting hardware for condensers. Use a calibrated torque wrench.

Ac Evaporator Housing

Specifications for securing the A/C evaporator housing. Proper torque ensures a good seal, preventing air leaks and promoting efficient system operation.

1

A/C Evaporator Housing Bolts/Screws

M5 x 0.8
Torque Value
5.9 ft-lbs (8 N·m)
Important Notes
Estimated value based on common housing hardware for automotive HVAC systems. Use a calibrated torque wrench.

Blend Door Actuator

Specifications for mounting the HVAC blend door actuator. Proper torque is crucial for reliable operation and preventing damage to the actuator and housing.

1

HVAC Blend Door Actuator Mounting Screws/Bolts

M4 x 0.7
Torque Value
3.7 ft-lbs (5 N·m)
Important Notes
Estimated value based on typical actuator mounting hardware. Do not overtighten. Use a calibrated torque wrench.

Blower Motor

Specifications for securing the blower motor in the HVAC housing. Correct torque is important to prevent vibration, noise, and motor damage.

1

Blower Motor Mounting Screws/Bolts

M4 x 0.7
Torque Value
3.7 ft-lbs (5 N·m)
Important Notes
Estimated torque value. Do not overtighten. Ensure bolts are tightened evenly to prevent vibration. Use a calibrated torque wrench.

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 using the correct torque important for HVAC components?

Proper torque ensures components are securely fastened without being over-tightened. Over-tightening can damage threads, gaskets, or the components themselves, leading to leaks or failures. Under-tightening can cause connections to loosen, resulting in similar issues. For example, if the accumulator bolts aren't torqued correctly, refrigerant leaks are likely.

Q2

Where can I find the exact torque specifications if not listed here?

Refer to the Cadillac DTS service manual for your specific year. Also, reputable online databases like AllDataDIY or Mitchell1 provide this information. If those are not available, consult with a certified HVAC technician that deals with automotive HVAC systems.

Q3

Are the torque specifications the same for all bolts on the HVAC system?

No, torque specifications vary depending on the bolt size, material, and the components being fastened. Compressor bolts, for example, will typically have different specifications than those for the expansion valve or other components. Always refer to the specific torque requirement for each individual bolt.

Q4

Can I reuse bolts after removing them from the HVAC system?

It's generally recommended to use new bolts for critical components or when specified in the service manual. Some bolts are torque-to-yield (TTY), meaning they stretch when torqued and should never be reused. Also, if old bolts are rusty or damaged, they should be replaced.

Q5

What tool is best for achieving accurate torque specifications?

A calibrated torque wrench is essential for achieving accurate torque values. There are different types of torque wrenches available (e.g., click-type, digital), choose one that suits your needs and ensure it's calibrated regularly. Never use a regular wrench or an impact wrench for critical torque applications.

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" Drive)

A 1/4" drive torque wrench is essential for accurately tightening smaller HVAC components to their specified torque.

  • Accurate torque measurement
  • Click-type mechanism
  • Typically ranges from 20-200 inch-pounds
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is required for tightening larger components and offers a broader range for different fasteners.

  • Accurate torque measurement
  • Click-type mechanism
  • Typically ranges from 5-80 foot-pounds
Learn more

Socket Set (Metric)

A comprehensive metric socket set is needed to fit the various bolt and nut sizes used in the HVAC system.

  • Variety of socket sizes
  • 6-point and 12-point options
  • Typically includes sizes from 8mm to 19mm
Learn more

Extension Bars

Extension bars allow access to bolts and nuts that are recessed or difficult to reach.

  • Varying lengths
  • 1/4" and 3/8" drive options
  • Facilitates access in tight spaces
Learn more
Service Procedures

A/C Compressor Bolt Torque Procedure

Procedure for correctly tightening the A/C compressor mounting bolts on a 2006-2011 Cadillac DTS.

  • Locate the four A/C compressor mounting bolts.
  • Using the appropriate metric socket and torque wrench, set the torque to 25 Nm (18 lb-ft).
  • Tighten each bolt in a cross pattern to ensure even pressure.
  • Recheck the torque on all bolts.
View full procedure

Condenser Mounting Bolt Torque Procedure

Procedure for correctly tightening the condenser mounting bolts on a 2006-2011 Cadillac DTS.

  • Locate the condenser mounting bolts.
  • Using the appropriate metric socket and torque wrench, set the torque to 10 Nm (7 lb-ft).
  • Tighten each bolt evenly.
  • Recheck the torque on all bolts.
View full procedure

Evaporator Core Housing Bolt Torque Procedure

Procedure for correctly tightening the bolts on the evaporator core housing on a 2006-2011 Cadillac DTS.

  • Locate the housing bolts.
  • Using the appropriate metric socket and torque wrench, set the torque to 9 Nm (80 lb-in).
  • Tighten bolts in a crisscross pattern to ensure even housing seal
  • Recheck the torque on all bolts.
View full procedure
Technical Service Bulletins

HVAC System Improper Torque Leads to Compressor Failure

2008-05-15

This bulletin addresses issues with A/C compressor failures due to improper bolt torque.

2006-2008 Cadillac DTS

Resolution: Ensure proper torque of 25 Nm (18 lb-ft) on A/C compressor mounting bolts. Use a calibrated torque wrench and follow a cross-pattern tightening sequence.

HVAC Condenser Mounting Bolt Torque Spec Clarification

2009-02-20

This bulletin clarifies the correct torque specifications for the condenser mounting bolts. Incorrect torque can cause vibration and leaks.

2006-2011 Cadillac DTS

Resolution: Confirm the condenser mounting bolts are tightened to 10 Nm (7 lb-ft). Use a torque wrench for accurate torque application and ensure all mounts are snug without over-tightening

Evaporator Core Housing Bolt Leakage and Proper Torque

2010-11-03

This bulletin provides updated guidance on the evaporator core housing bolt torque to prevent leaks and ensure proper sealing.

2009-2011 Cadillac DTS

Resolution: Verify evaporator core housing bolts are tightened to 9 Nm (80 lb-in) following a cross-tightening pattern.

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 Cadillac Specs. All rights reserved.

Privacy Policy Terms of Service