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Fluid level checks Lincoln Navigator 1998 - 2012 petrol 5.4 V8

OnDemand step-by-step maintenance & repair BETA

Lincoln Navigator 1998 - 2012  | 5.4 V8 Fluid level checks

  • time 5 to 30 minutes
  • difficulty 1
Fluids are an essential part of the lubrication, cooling, brake and windshield washer systems. Because the fluids gradually become depleted and/or contaminated during normal operation of the vehicle, they must be periodically replenished. See Recommended lubricants and fluids in your owner's manual before adding fluid to any of the following components. Note: The vehicle must be on level ground when fluid levels are checked

Engine oil

1 The oil level is checked with a dipstick (see below). The dipstick extends through a metal tube down into the oil pan
2 The engine oil dipstick is located on the driver's side of the engine
3 The oil level should be checked before the vehicle has been driven, or about 15 minutes after the engine has been shut off. If the oil is checked immediately after driving the vehicle, some of the oil will remain in the upper part of the engine, resulting in an inaccurate reading on the dipstick
4 Pull the dipstick out of the tube and wipe all the oil from the end with a clean rag or paper towel. Insert the clean dipstick all the way back into the tube and pull it out again
5 The oil level should be at or near the MAX area on the dipstick - if it isn’t, add enough oil to bring the level to near the MAX mark (it takes one quart of oil to raise the level from the lower to the upper mark)
6 Do not allow the level to drop below the MIN mark or oil starvation may cause engine damage. Conversely, overfilling the engine (adding oil above the MAX mark) may cause oil fouled spark plugs, oil leaks or oil seal failures
7 To add oil, remove the filler cap from the valve cover (see below). After adding oil, wait a few minutes to allow the level to stabilize, then pull out the dipstick and check the level again. Add more oil if required. Install the filler cap and tighten it by hand only
8 The oil filler cap on V6 engines is located on the left valve cover
9 The oil filler cap on V8 engines is located on the right valve cover
10 Checking the oil level is an important preventive maintenance step. A consistently low oil level indicates oil leakage through damaged seals, defective gaskets or past worn rings or valve guides. If the oil looks milky in color or has water droplets in it, the cylinder head gasket(s) may be blown or the head(s) or block may be cracked. The engine should be checked immediately. The condition of the oil should also be checked. Whenever you check the oil level, wearing gloves, slide your thumb and index finger up the dipstick before wiping off the oil. If you see small dirt or metal particles clinging to the dipstick, the oil should be changed

Engine coolant

Warning: Do not allow antifreeze to come in contact with your skin or painted surfaces of the vehicle. Flush contaminated areas immediately with plenty of water. Don’t store new coolant or leave old coolant lying around where it’s accessible to children or pets – they’re attracted by its sweet smell. Ingestion of even a small amount of coolant can be fatal! Wipe up garage floor and drip pan spills immediately. Keep antifreeze containers covered and repair cooling system leaks as soon as they’re noticed
1 All vehicles covered by this manual are equipped with a pressurized coolant recovery system. A plastic expansion tank located at the front (early models) or rear (late models) of the engine compartment is connected by a hose to the radiator. As the engine heats up during operation, the expanding coolant fills the tank
2 The coolant level in the tank should be checked regularly. Warning: Do not remove the expansion tank cap to check the coolant level when the engine is warm! The level in the tank varies with the temperature of the engine. When the engine is cold, the coolant level should be at or slightly above the FULL COLD mark on the reservoir. Once the engine has warmed up, the level should be at or near the FULL HOT mark. If it isn’t, allow the engine to cool, then remove the cap from the tank and add a 50/50 mixture of ethylene glycol based antifreeze and water
3 Drive the vehicle and recheck the coolant level. Don’t use rust inhibitors or additives. If only a small amount of coolant is required to bring the system up to the proper level, water can be used. However, repeated additions of water will dilute the antifreeze and water solution. In order to maintain the proper ratio of antifreeze and water, always top up the coolant level with the correct mixture. An empty plastic milk jug or bleach bottle makes an excellent container for mixing coolant
4 If the coolant level drops consistently, there may be a leak in the system. Inspect the radiator, hoses, filler cap, drain plugs and water pump. If no leaks are noted, have the expansion tank cap pressure tested by a service station
5 If you have to remove the expansion tank cap wait until the engine has cooled completely, then wrap a thick cloth around the cap and unscrew it slowly, stopping if you hear a hissing noise. If coolant or steam escapes, let the engine cool down longer, then remove the cap
6 Check the condition of the coolant as well. It should be relatively clear. If it’s brown or rust-colored, the system should be drained, flushed and refilled. Even if the coolant appears to be normal, the corrosion inhibitors wear out, so it must be replaced at the specified intervals

Brake and clutch fluid

1 The brake master cylinder is mounted on the front of the power booster unit in the engine compartment. The hydraulic clutch master cylinder used on manual transmission vehicles is located next to the brake master cylinder
2 To check the fluid level of the brake and clutch master cylinders, simply look at the MAX and MIN marks on the reservoir
3 The brake fluid level should be kept between the MIN and MAX marks on the translucent plastic reservoir
4 The clutch fluid reservoir is mounted on the firewall - add fluid until it reaches the FULL line
5 If the level is low, wipe the top of the reservoir cover with a clean rag to prevent contamination of the brake system before lifting the cover
6 Add only the specified brake fluid to the brake and clutch reservoirs (refer to Recommended lubricants and fluids in your owner’s manual). Mixing different types of brake fluid can damage the system. Fill the brake master cylinder reservoir only to the MAX line. Warning: Use caution when filling either reservoir - brake fluid can harm your eyes and damage painted surfaces. Do not use brake fluid that has been opened for more than one year or has been left open. Brake fluid absorbs moisture from the air. Excess moisture can cause a dangerous loss of braking
7 While the reservoir cap is removed, inspect the master cylinder reservoir for contamination. If deposits, dirt particles or water droplets are present, the system should be drained and refilled
8 After filling the reservoir to the proper level, make sure the lid is properly seated to prevent fluid leakage and/or system pressure loss
9 The fluid in the brake master cylinder will drop slightly as the brake pads at each wheel wear down during normal operation. If either master cylinder requires repeated replenishing to keep it at the proper level, this is an indication of leakage in the brake or clutch system, which should be corrected immediately. If the brake system shows an indication of leakage check all brake lines and connections, along with the calipers, wheel cylinders and booster. If the hydraulic clutch system shows an indication of leakage check all clutch lines and connections, along with the clutch slave cylinder
10 If, upon checking the brake or clutch master cylinder fluid level, you discover one or both reservoirs empty or nearly empty, the systems should be bled

Windshield washer fluid

Note: The windshield washer fluid reservoir also supplies washer fluid for the liftgate wiper system on Expedition and Navigator models
1 The windshield washer reservoir is located at the right front corner of the engine compartment next to the battery
2 In milder climates, plain water can be used in the reservoir, but it should be kept no more than 2/3 full to allow for expansion if the water freezes. In colder climates, use windshield washer system antifreeze, available at any auto parts store, to lower the freezing point of the fluid. Mix the antifreeze with water in accordance with the manufacturer’s directions on the container. Caution: Do not use cooling system antifreeze - it will damage the vehicle’s paint