How Do I Know If My Liftgate Struts Are Bad?

Which Vehicles Does This Apply To?

This guide applies to any vehicle equipped with a liftgate or hatchback that uses gas struts for support. This includes SUVs, hatchbacks, minivans, and some estate cars. Symptoms of failing liftgate struts are universal across all makes and models. Knowing when to replace them keeps your liftgate functioning safely and conveniently and avoids nasty bashes on the head.

How Do I Know If My Liftgate Struts Are Bad?

Failing liftgate struts exhibit several telltale signs, including slow or jerky liftgate movement, the inability for the liftgate to stay open on its own, and visible signs of wear or damage.

Here’s a breakdown of the symptoms:

Slow or Jerky Movement: A healthy liftgate should open and close smoothly. If the movement is hesitant, uneven, or jerky, the struts are likely losing pressure.
Liftgate Won’t Stay Open: This is the most obvious sign. If you have to manually hold the liftgate up, the struts have lost their ability to provide sufficient support. This becomes safety hazard.
Sagging Liftgate: The liftgate might initially open but then slowly sag or droop downwards. This indicates weakening struts.
Visible Damage: Inspect the struts for signs of oil leakage, corrosion, dents, or bends. Any visible damage compromises their function.
Unusual Noises: Hissing or squeaking sounds during liftgate operation can indicate internal strut damage or wear.
Increased Effort to Close: If the liftgate requires significantly more effort to close than usual, the struts may be failing to provide adequate assistance.

What Causes Liftgate Struts to Fail?

Liftgate struts are gas springs, meaning they use compressed gas to provide support and cushioning. Over time, the gas can leak out through worn seals, reducing their effectiveness. Other factors contributing to failure include:

Age: Like any mechanical component, struts have a limited lifespan. Regular use and environmental factors contribute to wear.
Temperature Fluctuations: Extreme hot and cold temperatures can degrade the seals and internal components of the struts.
Corrosion: Exposure to moisture and road salt can cause corrosion, weakening the strut body and seals.
Physical Damage: Impacts or excessive force applied to the liftgate can damage the struts.

What Size Strut Does a [Car] Need?

The correct size and force rating for liftgate struts varies depending on the vehicle make, model, and the weight of the liftgate. Refer to the vehicle’s owner’s manual or an online parts database for the specific specifications.

Here’s a general guide to finding the right size strut:

Check the Existing Strut: Look for a part number or force rating (in Newtons) printed on the body of the old strut. This is the most reliable way to find a direct replacement.
Use an Online Parts Database: Reputable auto parts retailers have online databases where you can enter your vehicle’s make, model, and year to find compatible liftgate struts.
Consult the Owner’s Manual: The owner’s manual may contain information about the type and size of liftgate struts used in your vehicle.
Measure the Old Strut: If you can’t find a part number, measure the extended length (eye-to-eye) and the stroke length (the distance the strut compresses). This information helps narrow down the selection.
Use Our Gas Spring Force Calculator: Determine the correct force needed using our Gas Spring Force Calculator, and then identify an appropriate strut based on your measurements.

Example Specifications (Illustrative Only)

NOTE: These are example figures ONLY. Do NOT use these as definitive replacements. Always check the exact specification for your vehicle.

Vehicle Model	Extended Length (mm)	Stroke Length (mm)	Force (N)
Ford Focus (Mk3) Boot	520	200	450
VW Golf (Mk7) Hatch	510	205	480
BMW 3 Series (E91) Estate	505	190	510

How Do I Replace It Step by Step?

Replacing liftgate struts is a straightforward DIY task. Here’s a step-by-step guide:

Gather Your Tools: You’ll need a flat-head screwdriver, a new set of liftgate struts, and possibly a small adjustable wrench.
Support the Liftgate: Before removing the old struts, use a prop rod or have an assistant hold the liftgate open. This prevents it from slamming down. Safety first!
Locate the Strut Mounting Points: The struts are typically attached to the liftgate and the vehicle body via ball-and-socket joints or similar connectors.
Remove the Old Struts: Use the flat-head screwdriver to gently pry the retaining clips or remove any fasteners securing the strut ends. Be careful not to damage the mounting points.
Install the New Struts: Align the new struts with the mounting points and snap the connectors into place. Some struts may require you to compress them slightly to fit.
Test the Liftgate: Carefully remove the prop rod or have your assistant release the liftgate. Ensure it opens and closes smoothly and stays open on its own.
Replace in Pairs: Always replace both liftgate struts at the same time, even if only one is visibly failing. This ensures even support and prevents premature failure of the new strut.

Safety Precautions

Wear Safety Glasses: Protect your eyes from debris or accidental release of pressure from the old struts.
Work in a Well-Lit Area: Ensure you have adequate lighting to see the mounting points and connectors clearly.
Use Proper Support: Always support the liftgate securely before removing the old struts.
Dispose of Old Struts Properly: Gas struts contain pressurized gas and should be disposed of according to local regulations.

Where Can I Buy One?

You can purchase replacement liftgate struts from various sources, including:

Online Auto Parts Retailers: Amazon, eBay, and other online retailers offer a wide selection of liftgate struts for various makes and models. Check current prices on Amazon (UK).
Local Auto Parts Stores: Repco, Halfords, and other local auto parts stores carry liftgate struts in stock or can order them for you.
Vehicle Dealerships: Dealerships offer OEM (Original Equipment Manufacturer) liftgate struts, which are guaranteed to fit and function correctly, but are typically more expensive.

Choosing the Right Brand

Several reputable brands manufacture liftgate struts. Some popular choices include:

Stabilus: A leading manufacturer of gas springs and struts, known for their quality and durability.
Sachs: Another well-regarded brand offering a wide range of automotive components, including liftgate struts.
Monroe: A popular brand known for their affordable and reliable struts.
Meyle: A German brand offering high-quality aftermarket parts, including liftgate struts.

Consider reading online reviews and comparing prices before making a purchase. Also, check the warranty offered by the manufacturer.

Closing

Knowing the signs of failing liftgate struts and how to replace them can save you money and prevent potential injuries. Remember to always prioritize safety and use the correct replacement parts for your vehicle. If you’re unsure about any aspect of the replacement process, consult a qualified mechanic. Find the correct strut for your car using our Gas Strut Size Finder.

For bespoke or bulk orders, contact our industrial team.