Table of Contents
Getting Started: Tools and Preparation
Before you lift the hood of a Lincoln Navigator, gather a few essentials. A sturdy stool or step ladder will help you reach the dipstick, which sits on the side of the engine bay. A flashlight, a clean rag, and a bottle of battery protectant are also handy. Because the Navigator is a large SUV, the dipstick can be hard to spot, especially for those of average height. Standing on a stool gives you the extra reach you need. Once the hood is open, take a moment to orient yourself: the coolant reservoir is usually located near the front of the engine, and the battery sits on the passenger side. Knowing where each component is will make the inspection faster and less stressful.
Coolant System Check
Open the hood and locate the coolant reservoir. The dipstick is usually marked with a minimum and maximum line. Pull the stick out, wipe it clean, and reinsert it fully before pulling it again to read the level. In the video, the coolant was at the maximum line, indicating the system is full. Next, crack the radiator cap to release pressure and check the thermostat. A clear, old‑school hydrometer can help you gauge the coolant’s strength. The hydrometer’s needle should sit near the middle of the scale, roughly 25 to 30 degrees below the zero mark. If it’s too low, the coolant may be too dilute; if it’s too high, it may be too concentrated. Adjusting the mixture ensures the engine stays within the optimal temperature range. The coolant’s color should be bright and free of debris; a murky or discolored fluid can signal contamination or a failing head gasket. If the coolant appears cloudy, it may indicate contamination.
Battery and Electrical Components
Inspect the battery terminals for corrosion. Clean them with a wire brush, then spray a thin coat of battery protectant. A clean battery helps maintain reliable starting power and reduces the risk of electrical shorts. While you’re under the hood, glance at the serpentine belt. It should be firm and free of cracks. Gently squeeze the hoses that feed the coolant and the brake system; they should feel firm, not soft or gummy. A soft hose can indicate a leak or a loss of pressure. The battery’s age and mileage are also worth noting; a 95,000‑mile Navigator typically has a battery that may need replacement within the next few years, depending on usage. Replacing the battery before it fails can prevent unexpected breakdowns.
Brake Fluid and Power Steering
The brake fluid reservoir sits near the driver’s side of the engine bay. Shake the reservoir gently; the fluid level should be at the maximum line. The Navigator uses electric power steering, so there is no separate power steering reservoir to check. Instead, focus on the brake fluid, which is critical for safe braking performance. If the level is low, top it up with the manufacturer’s recommended brake fluid. A low brake fluid level can cause a spongy pedal feel and reduce stopping power. Always use the type of brake fluid specified by the manufacturer.
Other Fluids and Final Checks
Check the winch washer jug, which still contains some fluid. The level should be visible through the side of the jug. A full jug indicates the winch system is ready for use. Also, inspect the jug for any signs of corrosion or leaks, as these can affect the winch’s performance. Verify tire pressures, ensure the windshield wipers are in good condition, and look for any signs of leaks around hoses and fittings. The Navigator’s sealed transmission means there is no dipstick for the transmission fluid; a small dipstick under the engine covers is not easily accessible. In a future video, the creators plan to demonstrate how to check the transfer case fluid, which is essential for off‑road capability. The transfer case fluid should be checked regularly, especially if the vehicle is used for towing or rough terrain, because it lubricates the drivetrain’s critical components. If the transfer case fluid is low, it can lead to overheating and premature wear.
With 95,000 miles on the odometer, the Navigator appears to be in great shape. Regular fluid checks, as shown in the video, help prevent overheating, electrical failures, and brake issues. By following these simple steps, you can keep your SUV running smoothly and avoid costly repairs. Remember that a well‑maintained fluid system is the backbone of any vehicle’s reliability, and a few minutes spent under the hood can save you hours of trouble down the road.