The hood is held up by a hood support system—most often a manual prop rod on older cars or a hydraulic gas strut (hood lift support) on newer models.
In modern vehicles, designers increasingly rely on gas-filled lift supports that automatically lift and hold the hood open, while older and budget models may still use a simple metal prop rod. This article explains what these devices are, how they differ, and how to identify and care for them.
Two main types of hood supports
There are two common systems that keep a hood open. Here are the basics of each, along with how to tell them apart.
- Hood prop rod — A rigid metal rod that you manually pivot out of a clip and insert into a hole on the hood or fender to hold the hood open. It’s simple, inexpensive, and common on older or budget vehicles.
- Gas strut / hood lift support — A small hydraulic-like cylinder mounted at the hinge that uses pressurized gas to lift and hold the hood. It usually requires little effort to raise the hood and can hold it in position automatically; common on many modern cars.
In short, if your hood stays up without you guiding it, you’re likely dealing with a gas strut. If you have to physically prop the hood with a rod, you’re dealing with a prop rod.
How to identify which system your car uses
Identifying the hood support system is usually straightforward by visual inspection and how you interact with the hood.
- Look at the engine bay front: a long slender rod that pivots from a clip is a prop rod. If you see a small cylinder attached near the hinge with a piston rod connected to the hood, that’s a gas strut.
- Check the hood edge and hinge area when the hood is closed. Prop rods are typically mounted on the side or front and can be swapped into holes to hold the hood open; gas struts are mounted at the hinges and move automatically as you open the hood.
- Test the feel: lifting a hood with a prop rod requires manual effort to keep it in position; a gas strut usually requires little effort and will hold itself open once raised.
Knowing which system you have helps with maintenance, replacement, and safety considerations.
Maintenance and safety tips
Maintenance and careful handling keep hood supports functioning reliably and safely. Follow these guidelines.
- Always support the hood with the appropriate method when working under it. If you have a prop rod, keep it securely in the support hole; if you have a gas strut, ensure the hood is supported until you’re ready to close it.
- Inspect for wear or damage. Look for oil or grease on the struts, signs of bending, or a rod that doesn’t seat firmly in its clips. Replace worn parts promptly.
- When replacing a gas strut, use a unit with the same stroke length and force rating and follow the manufacturer’s instructions. Use the proper disconnect tools to release and reattach the clamps safely.
- Avoid forcing the hood open or closed. For damaged struts or bent components, have a professional perform replacement to prevent injury or damage.
- Test the hood after replacement: open fully, hold for a moment, and then gently close to ensure the new support engages smoothly and safely.
Regular inspection and timely replacement ensure your hood stays safely in position during maintenance or inspections.
Summary
Most cars keep the hood upright with either a manual hood prop rod or a hydraulic gas strut. Prop rods require manual support and insertion into a clip, while gas struts use compressed gas to lift and hold the hood autonomously. Identifying which system you have is usually a matter of looking at the hinge area and noting whether a rod or a cylinder is present. Regular checks for wear and timely replacement keep hood supports functioning safely, ensuring you can work under the hood without worry.