How to Add Ac to Rear of Suv

Adding rear AC to your SUV improves comfort for passengers, especially on long trips. This guide walks you through the process, from choosing the right system to installation and troubleshooting. With the right tools and knowledge, you can upgrade your vehicle’s climate control safely and effectively.

Key Takeaways

• Choose the right rear AC system: Select a unit compatible with your SUV’s make, model, and electrical system to ensure proper function and safety.
• Plan your installation route: Map out where refrigerant lines, electrical wiring, and the evaporator will go to avoid interference with vehicle components.
• Use proper tools and safety gear: Always wear gloves and safety glasses, and use insulated tools when working with electrical and refrigerant systems.
• Follow manufacturer instructions: Never skip steps in the installation manual—doing so can lead to leaks, electrical issues, or system failure.
• Test the system before finalizing: Run the AC and check for cool air, leaks, and unusual noises before reassembling interior panels.
• Consider professional help if unsure: If you’re not confident in your mechanical skills, consult a certified technician to avoid costly mistakes.
• Maintain your rear AC regularly: Clean filters and check refrigerant levels periodically to keep the system running efficiently.

How to Add AC to Rear of SUV

If you’ve ever taken a long road trip with kids or passengers in the back seat, you know how quickly the rear of an SUV can become uncomfortably hot—especially in summer. While many newer SUVs come with factory-installed rear air conditioning, older models or base trims often lack this feature. The good news? You can add rear AC to your SUV with some planning, the right tools, and a bit of DIY know-how.

In this comprehensive guide, we’ll walk you through the entire process of how to add AC to the rear of your SUV—from choosing the right system to installing it safely and efficiently. Whether you’re a weekend mechanic or a first-time tinkerer, this step-by-step tutorial will help you upgrade your vehicle’s comfort without breaking the bank.

By the end of this guide, you’ll understand the different types of rear AC systems available, how to plan your installation, what tools you’ll need, and how to avoid common pitfalls. We’ll also cover troubleshooting tips and maintenance advice to keep your new rear AC running smoothly for years to come.

Let’s get started!

Why Add Rear AC to Your SUV?

Before diving into the installation, it’s important to understand why adding rear AC is a worthwhile upgrade. SUVs are designed to carry multiple passengers, often in the second and third rows. However, factory HVAC systems typically focus on cooling the front cabin, leaving rear passengers to rely on vents that may not deliver enough airflow—especially in larger vehicles.

Adding rear AC offers several benefits:
– Improved passenger comfort: Keeps everyone cool, reducing fatigue and irritability on long drives.
– Better air circulation: Helps distribute cool air evenly throughout the cabin.
– Increased resale value: A well-installed rear AC system can make your SUV more attractive to buyers.
– Enhanced safety: Prevents overheating, which can be dangerous for children, elderly passengers, or pets.

Whether you’re driving across the country or just commuting in hot weather, rear AC makes a noticeable difference.

Types of Rear AC Systems

Not all rear AC systems are created equal. Before you buy, you need to choose the right type for your SUV. Here are the three main options:

1. Factory Rear AC Upgrade Kits

Some automakers offer OEM (Original Equipment Manufacturer) rear AC kits designed specifically for your vehicle model. These kits are built to integrate seamlessly with your SUV’s existing HVAC system and wiring.

Pros:
– Perfect fit and compatibility
– Often include detailed installation instructions
– Maintain factory warranty (if installed correctly)

Cons:
– Can be expensive
– Limited availability for older models

If your SUV’s manufacturer offers a rear AC kit, this is usually the best option. Check with your dealership or search online using your vehicle’s VIN.

2. Aftermarket Rear AC Units

Aftermarket systems are third-party products designed to add rear cooling to vehicles that didn’t come with it. These are often more affordable and widely available.

Popular brands include:
– Dometic
– Webasto
– Cooling Solutions
– AutoTemp

These units typically include an evaporator, blower fan, control panel, and refrigerant lines. Some are self-contained, while others connect to your existing AC system.

Pros:
– More affordable than OEM kits
– Wide range of options
– Can be installed in most SUVs

Cons:
– May require more modification
– Risk of poor fit or compatibility issues

When choosing an aftermarket unit, make sure it’s rated for your SUV’s size and electrical system. Look for models with good reviews and clear installation guides.

3. Portable or Standalone AC Units

These are small, battery- or 12V-powered units that sit on the floor or seat. They’re not true AC systems but can provide spot cooling.

Pros:
– Easy to install (no permanent modifications)
– Portable and removable
– Affordable

Cons:
– Limited cooling power
– Not suitable for full cabin cooling
– Can drain your battery quickly

Portable units are best for occasional use or as a temporary solution. For permanent rear AC, go with a factory or aftermarket system.

Tools and Materials You’ll Need

Before starting the installation, gather all the necessary tools and materials. Having everything ready will save time and prevent frustration.

Basic Tools

– Socket wrench set
– Screwdrivers (Phillips and flathead)
– Wire strippers and crimpers
– Multimeter
– Drill and drill bits
– Measuring tape
– Zip ties
– Electrical tape
– Safety gloves and glasses

Specialized Tools

– AC manifold gauge set (for checking refrigerant pressure)
– Vacuum pump (to remove air and moisture from the system)
– Flaring tool (if you need to custom-fit refrigerant lines)
– Heat gun (for bending plastic tubing)

Materials

– Rear AC kit (evaporator, blower, control panel, etc.)
– Refrigerant (R-134a, typically 12–16 oz for rear systems)
– Refrigerant lines (if not included)
– Insulation tape or foam (to prevent condensation)
– Wire connectors and fuse taps
– Mounting brackets or hardware
– HVAC sealant (to prevent leaks)

Always double-check your kit’s contents against the manual to ensure nothing is missing.

Step-by-Step Installation Guide

Now that you’ve chosen your system and gathered your tools, it’s time to install the rear AC. Follow these steps carefully to ensure a safe and effective installation.

Step 1: Prepare Your Vehicle

Start by parking your SUV on a flat surface and disconnecting the negative terminal of the battery. This prevents accidental electrical shorts during installation.

Remove any interior panels that will interfere with the installation—typically the rear side panels, seat belts, and trim around the cargo area. Keep track of all screws and clips so you can reassemble everything later.

Step 2: Choose the Installation Location

Decide where to mount the evaporator and blower unit. Common locations include:
– Under the rear seat
– In the cargo area side panel
– Behind the rear seats (if space allows)

Make sure the location has:
– Enough space for the unit and airflow
– Access to power (12V source)
– A path for refrigerant lines to reach the front AC system (if connecting)

Use the measuring tape to confirm dimensions and mark the mounting points.

Step 3: Mount the Evaporator and Blower

Position the evaporator unit in your chosen location and secure it with the provided brackets or screws. Ensure it’s level and tightly fastened to prevent vibration.

Attach the blower fan nearby, ideally where it can draw in air and push it through the evaporator. Use zip ties or mounting hardware to secure it.

Step 4: Run Refrigerant Lines

If your system connects to the front AC, you’ll need to run refrigerant lines from the firewall to the rear.

– Locate the low- and high-pressure service ports on your existing AC system (usually near the firewall).
– Use a flaring tool to create proper connections on the new lines.
– Route the lines through the vehicle’s interior, avoiding sharp edges, heat sources, and moving parts.
– Secure the lines with zip ties and protect them with insulation tape to prevent condensation.

Tip: If you’re not comfortable working with refrigerant, consider hiring a professional for this step. Improper handling can damage the system or pose safety risks.

Step 5: Connect Electrical Wiring

Your rear AC unit will need power from the vehicle’s electrical system.

– Locate a 12V power source, such as the fuse box or a nearby accessory circuit.
– Use a fuse tap to safely draw power without cutting wires.
– Connect the unit’s wiring harness to the power source, ground, and control switch.
– Use a multimeter to verify voltage and ensure proper polarity.
– Secure all connections with wire connectors and electrical tape.

Safety Note: Always use an inline fuse (typically 10–15 amps) on the power wire to protect against shorts.

Step 6: Install the Control Panel

Mount the rear AC control panel in a convenient location, such as the rear side trim or center console.

– Drill a small hole for the wiring.
– Connect the control panel to the unit using the provided harness.
– Test the buttons to ensure they respond correctly.

Some systems come with wireless remotes or integrate with the front climate control. Follow the manufacturer’s instructions for setup.

Step 7: Evacuate and Charge the System

Before adding refrigerant, you must remove air and moisture from the system using a vacuum pump.

– Connect the manifold gauge set to the low- and high-pressure ports.
– Attach the vacuum pump and run it for at least 30 minutes.
– Close the valves and let the system sit for 10 minutes to check for leaks.

If the vacuum holds, you’re ready to charge the system.

– Slowly add the recommended amount of R-134a refrigerant.
– Monitor the pressure gauges to avoid overcharging.
– Start the engine and turn on the AC to test cooling.

Step 8: Test and Inspect

With everything connected, start your SUV and turn on the rear AC.

– Check that cool air is blowing from the rear vents.
– Listen for unusual noises (hissing, rattling, or grinding).
– Inspect all connections for leaks using soapy water (bubbles indicate a leak).
– Verify that the control panel works and adjusts fan speed and temperature.

If everything looks good, reassemble the interior panels and secure all components.

Troubleshooting Common Issues

Even with careful installation, problems can arise. Here’s how to fix the most common issues:

No Cool Air

– Check refrigerant levels—low charge means poor cooling.
– Ensure the compressor is engaging (listen for a click when AC is turned on).
– Verify that the blower fan is working.

Weak Airflow

– Clean or replace the evaporator filter (if applicable).
– Check for blocked vents or kinked ducts.
– Ensure the blower motor is receiving full power.

Water Leaks Inside the Cabin

– This is usually caused by condensation not draining properly.
– Check the drain tube—make sure it’s clear and routed outside the vehicle.
– Add insulation around refrigerant lines to prevent sweating.

Blowing Warm Air Intermittently

– Could indicate a refrigerant leak or faulty pressure switch.
– Use a leak detector or UV dye to find the source.
– Recharge the system if needed.

Electrical Problems

– If the unit won’t turn on, check fuses and wiring connections.
– Use a multimeter to test for continuity and proper voltage.
– Ensure the ground connection is secure.

Maintenance Tips for Your Rear AC

To keep your rear AC running efficiently, follow these maintenance tips:

– Clean the evaporator and filter every 6 months. Dust and debris reduce airflow and cooling.
– Check refrigerant levels annually. Low levels can damage the compressor.
– Inspect hoses and connections for cracks or leaks. Replace worn parts promptly.
– Run the AC regularly, even in winter. This keeps seals lubricated and prevents leaks.
– Keep the drain tube clear. Clogs can cause water damage inside the vehicle.

Regular maintenance extends the life of your system and ensures consistent performance.

Conclusion

Adding rear AC to your SUV is a smart upgrade that enhances comfort, safety, and overall driving experience. While the process requires careful planning and attention to detail, it’s entirely achievable with the right tools and guidance.

By choosing the right system, following the installation steps, and performing regular maintenance, you can enjoy cool, refreshing air in the back seat—no matter how hot it gets outside.

Remember, if you’re ever unsure about a step—especially when dealing with refrigerant or electrical systems—don’t hesitate to consult a professional. Safety should always come first.

With your new rear AC system in place, you’re ready to hit the road in comfort. Happy driving!