1999-2003 Ford Windstar Headlight Assembly: Diagnosis, Part Numbers, and Easy Replacement

Symptoms of a Failing Headlight Assembly

Problems with the Windstar's headlights can stem from the assembly itself, the bulbs, or the vehicle's electrical system. Here are the most common symptoms and their likely causes.

1. One Headlight is Out (Low or High Beam)

If a single beam (low or high) is out on one side, the first step is always to check the bulb. These vans use a dual-filament 9007 bulb, and it's common for one filament to burn out before the other. However, if a new bulb doesn't fix it, the problem often lies elsewhere. Forum users frequently report that a single inoperative low beam, while the high beam still works, is caused by a broken wire inside the wiring harness near the headlight socket or a faulty socket itself. The constant heat and vibration can make the wires brittle over time.

2. Headlights are Dim, Yellow, or Hazy

This is a gradual failure caused by sun exposure. The plastic lens is damaged by UV rays, leading to oxidation that creates a hazy, yellowed surface. This significantly reduces the amount of light that can pass through, making your headlights dangerously dim at night. While lens restoration kits can temporarily improve clarity, the hazing will eventually return. Replacing the entire assembly is the only permanent solution.

3. Moisture or Condensation Inside the Lens

If you see water droplets or fogging inside the headlight, the seal between the lens and the housing has failed. This is a common issue on older vehicles. The moisture can cause the reflective chrome surfaces to peel and will dramatically shorten the life of the bulbs. In some cases, owners have drilled a small drain hole in the bottom of the housing as a temporary fix, but replacement is the correct repair.

4. Both Headlights Don't Work or Fail Intermittently

If both headlights stop working at the same time, the problem is unlikely to be the assemblies themselves. The cause is almost always electrical. Check the headlight fuses and relays in the under-hood fuse box first. If those are good, the next most likely culprits are the main headlight switch on the dashboard or the multi-function (turn signal) stalk on the steering column. On other Ford vehicles from this era, a failing Lighting Control Module (LCM) is a known cause for intermittent or total headlight failure, and while not subject to the same specific recall, the Windstar can exhibit similar behavior.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While there are no recalls specifically for the headlight assemblies on the 1999-2003 Windstar, several related issues are worth noting.

• Lighting Control Module (LCM) Failures: A recall on other Ford models (Crown Victoria, Grand Marquis) from the same era was issued for faulty LCMs that could cause the headlights to suddenly turn off while driving. This was due to cracked solder joints inside the module. While the Windstar was not part of this recall, similar symptoms can occur and may point to a faulty LCM or multi-function switch.
• Wiring and Electrical Faults: Owners frequently report issues where one beam fails due to a broken wire at the connector, not a bad bulb or fuse. Troubleshooting should include checking for power and ground directly at the headlight socket with a multimeter.
• Major Corrosion Recalls: The 1999-2003 Windstar was subject to major safety recalls for severe corrosion of the front subframe (Recall 11S16) and rear axle (Recall 10S13), particularly in states that use road salt. While not directly related to the headlights, these are critical safety issues for any owner of this vehicle.

Buying a Used 1999-2003 Windstar Headlight Assembly

Buying a used OEM headlight can be a good value, but careful inspection is critical. Given the low price of new aftermarket assemblies, only consider used if it's in excellent condition.

What to Inspect on a Used Assembly:

• Lens Clarity: This is the most important factor. Look for a crystal-clear lens. Avoid any assembly that is yellow, hazy, or has peeling clear coat. Some sellers will offer "restored" headlights, but the quality of this work varies. A factory-original clear lens is always better.
• Mounting Tabs and Pins: The assembly is held in by two long metal retaining pins. While the assembly itself is robust, ensure the plastic channels where these pins slide are not cracked or broken.
• Housing Integrity: Check the black plastic housing for any cracks, especially around the seams and bulb openings. A cracked housing is the primary cause of moisture intrusion.
• Internal Reflectors: Look inside the lens at the chrome reflectors. They should be bright and shiny. If they are peeling, flaking, or look burnt, the assembly has likely suffered from moisture damage or has been used with incorrect, high-wattage bulbs.
• Wiring and Sockets: If the assembly includes the wiring pigtail and bulb sockets, inspect them for any signs of melting, corrosion, or brittle insulation.

Replacement and Aiming Guide

Replacing the headlight assembly on a 1999-2003 Windstar is one of the easiest repairs you can perform on the vehicle.

Step-by-Step Replacement:

1. Open the Hood: Secure the hood in the open position.
2. Locate Retaining Pins: Look directly behind the headlight assembly. You will see two metal retaining pins, each with a handle on top.
3. Remove Retaining Pins: Simply pull straight up on the handles to remove both pins. They may be snug, but no tools are required. A slight wiggle may help.
4. Slide Assembly Out: With the pins removed, the entire headlight assembly will slide directly forward, out of the vehicle.
5. Disconnect Wiring: Unplug the main electrical connector from the back of the assembly. Twist and remove the turn signal bulb socket to transfer it to the new assembly.
6. Installation: Installation is the reverse of removal. Connect the wiring, slide the new assembly into place, and re-insert the two retaining pins, pressing them down firmly until they are fully seated.

Headlight Aiming (Required After Replacement):

Proper aiming is crucial for safety and is legally required. You will need a level surface, a wall or garage door, a tape measure, and a Phillips #2 screwdriver or an E8 Torx socket.

1. Park the van on a level surface, exactly 25 feet from a flat vertical wall.
2. Measure the height from the ground to the small circle molded into the center of your headlight lens. Mark a horizontal line on the wall at this exact height with tape.
3. Turn on the low beams. The top of the bright, horizontal cutoff of the beam pattern should be exactly on or just slightly below your tape line on the wall.
4. Locate the vertical adjustment screw on the back of the headlight assembly. Turn this screw to raise or lower the beam until it is properly aligned with your mark on the wall.

Cost Comparison

Frequently Asked Questions (FAQ)

Part Numbers & Specifications