Harper Lin
Splitting headlights can be a tricky task, especially when it comes to the Volkswagen Golf Mk4 model. While some attempt to use a heat gun or the oven method to separate the glass, others suggest a more straightforward approach by removing the bumper and the four bolts holding the headlight assembly. It is important to note that the chrome/silver finish around the projector is delicate and can be easily scratched. Additionally, the headlight assembly includes adjustment devices for vertical and horizontal aiming, which can be controlled with a Philips head screwdriver.
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What You'll Learn
Removing the bumper
First, locate the bolts securing the bumper in place. There should be four bolts in total, two of which are positioned under the headlights. These bolts will need to be removed to detach the bumper completely. It may be challenging to access the bolts under the headlights without first loosening or partially removing the bumper, so keep that in mind as you plan your approach.
Before beginning the removal process, ensure you have the necessary tools, such as the appropriate-sized wrench or socket to fit the bolts. Additionally, having a tray or container to place the bolts in once removed can help ensure they remain together and do not get lost.
Once you have prepared your tools and workspace, you can start removing the bolts. Place your tool of choice on the first bolt and apply gentle force to begin loosening it. Turn the bolt counterclockwise, being careful not to strip the threads or damage the bolt head. Repeat this process for the remaining three bolts, taking your time to ensure a safe and controlled process.
With all four bolts removed, you can now carefully detach the bumper. Start by gently pulling the bumper away from the vehicle, being mindful of any wiring or other components that may still be connected. If you encounter resistance or feel that something is still holding the bumper in place, inspect the area for any missed bolts or other fasteners that may require removal.
Once the bumper is removed, place it in a safe area where it will not be damaged or scratched. You can now access the headlights and proceed with your maintenance or replacement tasks. Remember to keep the removed bolts in a safe place so that you can securely refasten the bumper once your work is complete.
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Using a screwdriver
To split MK4 Golf headlights using a screwdriver, you can follow these steps:
First, remove the four screws from the wheel arch liner using a ratchet and a T25 Torx screwdriver. Next, remove the three screws from the front bumper using a T30 Torx screwdriver. This will allow you to remove the lower grilles and access the hidden bolt.
Now, disconnect the wiring harness from the unit. Squeeze the plug and pull it straight out from the assembly. There are four T25 Torx screws that hold the assembly in place. Remove these with your screwdriver, and then pull the unit out of the front of the car. Place the lens down on a soft cloth or rag.
From the back, you can access the high beam bulb, low beam, turn signal, and fog light area. You can also see the vertical and horizontal adjustment mechanism. Using a Philips head screwdriver, you can turn the two plastic knobs to adjust the aim of the lights.
To change the high beam bulb, squeeze in on the clasp and pull the cover up and back. You can also use a small screwdriver to lever the bulb out of the socket, but be careful not to touch the bulb with your bare skin or dirty gloves as this can shorten its life expectancy.
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Disconnecting the wiring harness
The wiring harness is held in place by four T25 Torx screws, two on the upper section and two located below the lens. Once the wiring harness is disconnected, you can remove the four screws and pull the unit out of the front of the car. Place the unit lens down on a soft cloth or rag to protect it from scratches.
With the unit removed, you will have access to the high and low-beam bulbs, as well as the turn signal and fog light areas. You can also access the vertical and horizontal adjustment mechanism from the back of the unit.
It is important to note that the headlight assembly includes two adjustment devices for aiming the lights while mounted in the car. These are two plastic knobs that can be turned with a Philips-head screwdriver to assist in vertical and horizontal adjustments.
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Removing the Torx screws
First, disconnect the wiring harness from the headlight unit. The harness plugs into the unit near the high beam bulb. Gently squeeze the plug and pull it straight out from the assembly.
Now you can access the Torx screws. There are four T25 Torx screws in total that hold the headlight assembly in place. Two screws are located in the upper section, and the other two are positioned below the lens. Using the appropriate Torx screwdriver, carefully remove these screws. Be gentle, as you don't want to strip the screws or damage the surrounding plastic.
With the Torx screws removed, you can now carefully pull the headlight unit out of the front of your Golf. Place the unit lens-down on a soft cloth or rag to protect it from scratches.
At this point, you will have access to the bulbs and adjustment mechanisms. If you need to replace the high beam bulb, simply squeeze in on the clasp and pull the cover up and back.
Reinstalling the headlights is essentially the reverse of this process. Ensure you handle the headlights with care and avoid touching the glass or plastic with your fingers to prevent leaving smudges or grease marks.
Remember, working on your car's lighting system requires caution and attention to safety. Always wear the necessary protective gear and ensure the vehicle is parked safely and securely before beginning any work.
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The oven method
To begin, set your oven to a temperature of around 100°C. Place the headlights inside the oven and leave them for approximately 30-45 minutes. This will heat up the adhesive, making it easier to prise the headlights apart. It is important to wear oven gloves or use tools to handle the headlights, as they will be very hot.
Some people have reported success with even shorter heating times. For example, heating the headlights at 200°C for just 2 minutes can be enough to soften the adhesive and allow for easy separation. However, it is important to monitor the process closely to avoid overheating or damaging the headlights.
After splitting the headlights, it is important to reseal them properly to prevent water ingress. This is true for both OEM and non-OEM headlights. Proper resealing will ensure that your headlights remain functional and leak-free.
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Frequently asked questions
Place the headlights in the oven for 30-45 minutes at 100°C. Remove them using oven gloves and prise them apart.
Use a heat gun to heat the headlights and then use a screwdriver to separate the glass.
Tie silica bags to a piece of string and leave them in the headlight overnight to get rid of condensation.
