How to adjust the trunk popping force?
3 Answers
Locate the opening tension spring of the trunk. For new cars, it is normally set at the first gear. If the opening and closing force of the trunk lid is insufficient, it can be adjusted to the second or third gear as needed. If the hydraulic strut of the trunk has lost its elasticity, it is best to take it to an auto repair shop or a 4S store for repair. The hydraulic strut must not be disassembled.
Last time I helped my neighbor adjust the trunk of his old Jetta sedan. The spring tension was insufficient, causing the trunk to only open a small gap. First, locate the spring hooks on both sides of the trunk. Use a pry bar to secure the spring compression slot, then move the hook one notch toward the extension direction to increase tension. If the hydraulic struts fail, it becomes more complicated - you'll need a socket wrench to remove the old struts, and must select replacement struts with the correct pressure rating. This kind of physical work is best done with two people cooperating, as sudden spring release can easily injure hands. After adjustment, remember to repeatedly test the opening/closing angle - it should stay stable when paused mid-way to be considered properly adjusted.
For us girls doing it ourselves, the focus should be on the hydraulic struts, as they are key to adjusting the spring force. Last winter, when my Polo's trunk froze and wouldn't pop open, it turned out the struts were leaking oil. When buying new struts, be sure to measure both the fully retracted and fully extended lengths. During installation, pry open the metal clips on the fixed end and use a flathead screwdriver to push against the retaining spring for removal. When installing new struts, align them vertically with the ball socket interface and press firmly until you hear a click, indicating proper engagement. It's recommended to replace both struts simultaneously to maintain balanced force.
