3mirrors Rear A/C Block Off Kit Line Terminator Instruction Manual

Product Overview

The 3mirrors Rear A/C Block Off Kit is designed to terminate the rear air conditioning lines in compatible vehicles, allowing the front air conditioning system to operate independently without refrigerant loss from the rear. This kit provides a cost-effective solution by eliminating the need for expensive repairs or replacement of damaged rear A/C lines or evaporators.

The kit includes two block-off adapters, two M8 flange nuts, two hexagon head bolts, and two HNBR washers. All components are manufactured from high-quality materials for durability and reliable sealing.

Image: All components of the 3mirrors Rear A/C Block Off Kit, including the two silver block-off adapters, two long threaded bolts, two hexagonal nuts, and two black HNBR washers.

Setup and Installation

This kit is designed for straightforward installation in the engine compartment area. No modifications to the front air conditioning lines are required.

Required Tools (Not Included):

• Wrench or socket set appropriate for M8 bolts and nuts.
• Basic automotive hand tools.

Installation Steps:

1. Locate Rear A/C Lines: Identify the rear air conditioning lines at their connection point, typically in the engine compartment.
2. Disconnect Rear Lines: Carefully disconnect the existing rear A/C lines from the system. Ensure any remaining refrigerant is properly recovered by a certified technician if the system was still charged.
3. Prepare Block Off Adapters: Ensure the HNBR washers are correctly seated on the block-off adapters. These washers are specifically designed for cooling systems to provide a superior seal.
   

   Image: A close-up comparison showing the new 3mirrors Upgraded HNBR Washers (top) and older, less durable washers (bottom). HNBR provides enhanced sealing and durability for cooling systems.
4. Install Block Off Kit: Position the block-off adapters at the connection location where the rear A/C lines were removed. Secure them using the provided M8 hexagon head bolts and flange nuts. Tighten securely to prevent leaks.
   

   Image: The two block-off adapters shown assembled with their respective M8 bolts and flange nuts, ready for installation.

5. Verify Installation: Double-check all connections to ensure they are tight and properly seated.

It is recommended that installation be performed by a knowledgeable technician to ensure proper sealing and system integrity.

Operating Principle

Once installed, the 3mirrors Rear A/C Block Off Kit effectively seals off the rear air conditioning circuit. This prevents refrigerant from escaping through the disconnected rear lines or evaporator, allowing the front air conditioning system to function normally and maintain its charge. The kit ensures that the vehicle's primary A/C system remains operational without the need to repair or replace the rear components.

Maintenance

The 3mirrors Rear A/C Block Off Kit is designed for long-term durability with minimal maintenance. The components are made from corrosion-resistant 304 stainless steel and high-quality aluminum alloy CNC. The HNBR washers are specifically chosen for their superior resistance to refrigerants and temperature fluctuations, significantly reducing the likelihood of leaks over time.

• Periodic Inspection: Periodically inspect the installed block-off kit for any signs of leakage or corrosion.
• Cleaning: If necessary, clean the exterior of the components with a damp cloth. Avoid harsh chemicals that could degrade materials.

Troubleshooting

The primary function of this kit is to prevent refrigerant leakage from the rear A/C lines. If you experience issues with your front A/C system after installation, it is unlikely to be directly caused by the block-off kit itself, unless there is an installation error leading to a leak at the block-off point.

• Refrigerant Leakage: If you suspect a leak at the block-off kit installation point, re-check the tightness of the bolts and ensure the HNBR washers are properly seated and undamaged. A professional leak detection service may be required.
• Front A/C Malfunction: If the front A/C system is not functioning, this kit does not address issues with the front compressor, condenser, evaporator, or other front system components. Consult a qualified automotive technician for diagnosis and repair of the front A/C system.

For any questions or concerns regarding the product or its installation, please refer to the support section.

Specifications

Feature	Detail
Product Name	Rear A/C Block Off Kit Line Terminator
Brand	3mirrors
Model Number	B07XCB1YN3
Compatible Vehicles	2002-2009 Chevy Trailblazer, Envoy, Select Minivan, Mid-Size and Compact SUV
Material (Adapters)	High-quality Aluminum Alloy CNC
Material (Bolts & Nuts)	304 Stainless Steel
Sealing Material	HNBR (Hydrogenated Nitrile Butadiene Rubber) Washers
Bolt Thread Size	M8
Number of Pieces	6 (2 adapters, 2 bolts, 2 nuts, 2 washers)
Color	Silver
Item Shape	Hexagonal (for bolts/nuts)
Dimensions (Adapters)	Refer to image for detailed measurements. Example: 0.67in/17mm, 0.55in/14mm, 1.14in/26.5mm, 0.70in/18mm. Image: Detailed dimensions of the two block-off adapters, showing various measurements in both inches and millimeters.

Warranty and Support

3mirrors is committed to providing professional auto parts and efficient tools. While specific warranty terms are not detailed here, the product is backed by the manufacturer's commitment to quality.

If you have any questions regarding the installation, compatibility, or performance of your 3mirrors Rear A/C Block Off Kit, please do not hesitate to contact 3mirrors customer support. They are available to provide assistance and offer solutions.

For direct support, please refer to the contact information provided with your product packaging or visit the official 3mirrors store on Amazon:

Visit the 3mirrors Store