FAQ

Even though the air suspension system in your car is complex, in most cases the problems are easy to diagnose. On this page, the answers to many of your questions can be found here.

Have a question? Want to phone in your order?

To order or ask technical questions call us toll free at 1-800-251-8993.

Our office hours are:
8:00 AM to 7:00 PM ET Monday-Friday


  • What is the Arnott Warranty on Air Suspension parts?

    Arnott offers a Limited Lifetime Warranty for customers in North America and in the European Union. Orders outside of these regions come with a Limited Two-Year Warranty. Arnott’s Warranty is non-transferable. If a part is defective, Arnott will either replace or repair that part, as long as it is within the Warranty period and proof of purchase is provided. Arnott offers a Limited 30-Day Warranty on parts used in commercial vehicles. Improper use or installation is not a manufacturer's defect.

    Arnott is so confident you will be 100% satisfied with Arnott products that it offers you a 30-Day Money Back Guarantee and a 90-Day Return Policy on unused and uninstalled products.

    For complete Warranty details and limitations, please click here.



  • Is it possible to return a part if I do not want it?
    You may return a part as long as it is less than 30 days from the date of purchase or within 90 days for unused and uninstalled products. An original Arnott invoice and a Return Material Authorization (RMA) number are required.

  • How long does it take to receive my order?
    Arnott Inc. ships from multiple distribution centers but not all parts are available in all warehouses. Ground shipping may take 1-5 business days, depending on what items are ordered and the state in which you live. UPS shipping options do not include Saturday delivery. Please email or call Arnott for Saturday delivery options (if available in your area). Next Day Air will arrive the next business day in the United States, 3-Day delivery will arrive in 3 business days. (Monday-Friday).

    Online orders placed before 2:30pm ET and Phone orders placed before 3:30pm ET (for in-stock items) will be sent out that day when possible (2:00 PM ET in Canada) . Orders may be placed by phone Monday thru Friday 8:00 AM to 7:00 PM ET (except on US holidays.) You may place orders online 24 hours a day, 7 days a week. Online orders placed on weekends or US holidays will be filled the next business day.
    Arnott Offers Fast Shipping of Air Suspension Products


  • Is there a way to avoid paying the core charge?
    To avoid having to pay a core charge when purchasing some of Arnott's new or remanufactured products, you may be able to first send the used part to Arnott (you must contact Customer Support to set this up). After receiving the core and payment for the new or remanufactured part, Arnott will immediately send you the new or remanufactured part from inventory (if available). For further information please call Arnott during normal business hours or email Customer Support.

    NOTE: This may also apply to products unavailable for International Shipping. These international customers may still be able to buy excluded products if they can send the used part (or an exact core from a different vehicle) to Arnott. After inspection of the core, Arnott will immediately ship the purchased new or remanufactured Arnott product from available inventory using the customer's preferred shipping method. For further information please call Arnott during normal business hours or email Customer Support.

  • How do I Return Cores to Arnott
    Arnott has made it easy to return your cores (used OE Air Suspension Parts) for the refund of your core deposit (for North American customers). Carefully pack your core in the box that your new Arnott product came in and include a copy of your invoice for your core deposit refund. You should have also received a pre-paid shipping label which you can put on the outside of the box and then return the core to Arnott. It is that simple. If you did not receive a pre-paid shipping label please call 800-251-8993 or email cores@arnottinc.com. We will promptly email, fax or mail you a label.

  • Does Arnott ship internationally?
    Yes, Arnott ships many of its parts worldwide using United Parcel Service (UPS). Arnott can ship via United States Postal Service (USPS) by request. For an immediate estimate on International Shipping, please add your item to the Arnott Shopping Cart and proceed to Checkout. You will not be required to add payment information before seeing shipping method options.

    For product or shipping questions please click here. Be sure to list part number, description, and include your street address, city, and country.

    Quoted shipping times are estimates only and are not guaranteed.

    *International Shipping charges DO NOT include customs fees, import taxes, brokerage fees, or duties. Please contact your local customs office for more information on these costs.

    NOTE: Some products are not available for shipping to locations outside of North America. These international customers may still be able to buy excluded products if they can send the used part (or an exact core from a different vehicle) to Arnott. After inspection of the core, Arnott will immediately ship the purchased new or remanufactured Arnott product from available inventory. For further information, please call Arnott during normal business hours or email Customer Support.

  • Which side of my car is the Right and Left?
    The right and left sides of an automobile are determined as if sitting in the car facing forward. Thus, the left side is on the left when sitting in the car facing forward, and the right side is on the right. For American cars, the driver’s side is on the left, and the passenger sits to the right of the driver. For cars in Japan, Britain, Ireland, the Bahamas and some other former British colonies -- where they drive on the left side of the road -- the passenger sits on the left side, and the driver (along with all the driving controls) is on the right.

  • Why do some of your compressors look different from the original factory part?
    Some Arnott compressors feature improvements to the original design. For example, the aftermarket compressor for the Lincoln Continental Mark VIII has an internal filter rather than an external filter. Also, sometimes customers confuse the air suspension compressor with the ABS (brakes) compressor. The ABS compressor will have metal lines, rather than plastic.

  • How can I tell if my Mercedes has 4MATIC®?
    4MATIC® is a Mercedes registered trademark for all-wheel drive. Usually, if the vehicle features 4MATIC® , there will be an emblem on the right side of the trunk. See illustration below.



  • Do Arnott products include instructions?
    Detailed installation manuals are available for most Arnott products. Arnott has also produced professional installation videos for a growing list of products to help your team quickly learn about and install our products. All available manuals and videos can be accessed at ArnottManuals.com.

  • How can I tell if my Mercedes S-Class is equipped with AIRMATIC® or ABC?
    AIRMATIC® is a Mercedes trademark for air suspension. ABC stands for Active Body Control. ABC was a rare option on all S-Class models. ABC, however, was standard on all S-600, S-55, S-63, and S-65 models. You can tell which suspension you have by opening the hood of your car and examining the top of the shock absorber.

    If the car is equipped with AIRMATIC, you will have obvious air lines leading from the top of the shocks.

    If your car is equipped with ABC, you will have small black electrical plugs leading into the top of both shocks.



  • What are Variable-Rate Coil Springs?
    Variable-rate coil springs are metal springs designed to change stiffness as they deflect. A variable-rate spring uses coils of varying thickness or spacing to provide a softer ride when the vehicle is carrying a light load, but a firmer ride when the load increases. On many vehicles, the rear air springs can be replaced easily with variable-rate springs. While variable-rate springs can help with heavier loads, they are not meant to be a replacement for load-leveling air suspension in vehicles used to tow large trailers or heavy loads.

  • What is ADS? How can I tell if my Mercedes is equipped with ADS suspension?
    ADS stands for Active Dampening System. ADS is standard on all GL550 and ML trucks equipped with AIRMATIC. ADS was optional on all other GL models such as the GL320, GL350, and GL450. You can easily check to see if your truck is equipped with ADS by examining the AIRMATIC control buttons located on the dash panel below the Air Conditioning controls. Please see pictures below.



  • Will Arnott aftermarket air suspension parts ride differently from the originals?
    No. Arnott aftermarket air springs are just like the originals. You will not notice any difference in ride quality. Arnott designs its air springs with the same spring rate and load capabilities set by the original manufacturer.

  • What types of payments do you accept?
    Arnott accepts all major credit cards including Visa, MasterCard, American Express, and Discover. If you do not have a credit card you may also pay via PayPal, Bank Wire, or mail a Cashier’s Check or Money Order (excluding Canada and some other international locations. Not all payment options are available in all countries - call or email for details).

  • How can I tell if my GM Truck has Autoride?
    GM vehicles have a sticker called the Service Parts Identification Label located in the glove compartment (for trucks & SUVs) that includes information such as the vehicle’s VIN, Wheel Base, Model designation and a list of the vehicle’s 3 digit/character RPOs or Regular Production Options which are the options that car comes with. The code Z55 is the RPO code which indicates the option of Autoride electronic suspension.

  • How do I pay using PayPal?
    PayPal Payment Instructions: After you Confirm and Submit your order on the last checkout screen, you will be redirected to PayPal’s secure login screen. Please login to your PayPal account and follow the instructions to review your information and select your PayPal payment method. After you confirm your PayPal payment to ARNOTT INC. by pressing the Continue button, you will be redirected back to an Arnott confirmation screen. You will receive your order information via email from Arnott, and PayPal also will email you a confirmation.

    Please note: To avoid shipping delays, your PayPal Shipping address should match the shipping address you provided Arnott on the Shipping Address checkout screen. Also, if you pay with a PayPal eCheck from your bank, Arnott will have to wait to ship your order until it receives that payment from PayPal. Arnott does not have to wait if your PayPal payment method is a Credit Card of if your payment method is an “Instant Transfer” from your bank.

  • Where are Arnott parts made?
    Most Arnott parts are assembled at Arnott's Merritt Island, Florida facility using high-quality foreign and domestic components. Foreign materials are part of many of the import cores Arnott remanufactures, OE compressors Arnott sells, and various components used to assemble Arnott springs, new and remanufactured parts, and conversion kits.

  • Should I replace my air suspension parts or just convert my car to coil springs?
    If you like the load-leveling capabilities, or if you tow with your vehicle, then you should repair the air suspension system. If you are tired of replacing the many components of which your air suspension consists, then Arnott's coil spring conversion kit should be perfect for you.

  • Do I have to weld or modify my car to make Arnott coil spring conversion kits fit?
    Absolutely not! Arnott conversion kits are designed to bolt directly to your vehicle's suspension. No special tools are necessary to install Arnott conversion kits. Arnott kits come preassembled and ready to bolt in. All Arnott suspension brackets are specifically engineered for your vehicle, and CNC-machined at the Arnott factory in Merritt Island, FL.

  • How can I tell if my Cadillac is a Concours or an ETC model?
    The vehicle should be labeled as such on the rear or side doors.



  • Will Arnott designed new struts work with my vehicle's suspension controls?
    Arnott Remanufactured OE struts use the vehicle’s internal electronic controls to adjust factory supplied suspension controls such as auto-leveling and / or auto damping (where available). Arnott designed new struts use custom valved shocks that don’t require or use the factory air suspension controls.

  • Should I replace the air dryer along with my leaky air springs?
    Yes. Arnott highly recommends changing the air suspension dryer when you have had a leak in the air suspension system. The air dryer becomes saturated with moisture when the compressor is overworked because of a leak in the system. Replacing the air dryer will prolong the life of your air compressor and air spring solenoids.

  • How long do air suspension parts last?
    Air springs normally last 80,000 to 100,000 miles. Over this time, the rubber bladder dries out, and cracks appear around the bottom piston. Compressors usually wear out because of leaky air springs. However, the computer and height sensors generally last the life of the vehicle.

  • How do I remove the air lines from my compressor dryer or solenoid?
    The air lines are removed by pushing in on the fitting and pulling out on the line at the same time. The fitting usually has an orange plastic ring around it. If it does not, that is okay ... simply push in on the brass fitting instead.

  • Where can I find definitions for some of the automotive terminology used on the Arnott site?
    Confused by ride control terminology? Arnott has a compendium of ride control and suspension terms. The online dictionary includes almost 100 terms broken down in alphabetical order. The list includes popular terms used in Arnott part descriptions along with other terms from the suspension and air suspension industry. To access the list please click here.

  • What is the difference between Arnott's New Passive Rear Shock (AS-2700) and the Arnott Remanufactured Rear Shock (AS-2708)?

    AS-2700 - Arnott New Passive Rear Air Shock

    This air-assisted shock replacement is new and not remanufactured. Internal shock damping is not electronic and includes a bypass sensor to turn off any warning lights.

    AS-2708 - Arnott Remanufactured OE Electronic Air Shock

    This remanufactured air-assisted electronic shock provides OE electronic damping and air leveling is the same as the original.

  • I installed Arnott's shocks (AS-2715, SK-2649 and SK-2671) however, now my ABS and Stability Traction control light is on. What do I do?
    There’s an ABS sensor along the frame rail near the top mount on the shock. It is possible that this may be disconnected. If it is, plug it back in and the message should go away.