Have you ever opened the hood of your car and felt overwhelmed? You’re not alone! Many beginners (and even some experienced drivers) are unsure how to perform basic under-the-hood checks. However, taking a few minutes every couple of weeks to look things over can keep your vehicle running smoothly and save you from expensive repairs later on.

Below, we’ll walk through the essential fluids to check, show you where to find them, and explain how to make sure they stay at the proper levels. We’ll also cover a few other under-the-hood basics like your air filter and battery. By the end, you’ll know how to safely open and close your hood, top off fluids, recognize potential problems, and keep your car in great shape.

1. Opening the Hood Safely

Locate the Hood Release:

In most cars, you’ll find the hood-release handle on the driver’s side, near your left knee or footwell. Give it a pull or press the lever to release the hood. Some newer vehicles have a two-stage hood release (you pull the hood lever twice). Always check your owner’s manual if you’re unsure.

Secondary Lock:

Once you pop the hood from inside the car, there’s typically a second safety latch under the hood itself. It’s designed to prevent the hood from flying open if the main latch isn’t fully engaged.

Feel around the center edge (or check slightly off-center) for a small lever or tab. Push or lift it to release that final catch, then open your hood fully.

Support the Hood:

Some cars use hood supports (called struts or shocks) that hold the hood up automatically. Older or more basic models have a metal rod (prop) that you’ll slide into place to keep the hood from falling on your head.

Safety Tip: If your struts are worn out (the hood drifts downward), consider replacing them. In the meantime, you can buy a hood-support clamp or use a prop rod to keep it from accidentally slamming shut.

2. Checking Your Engine Oil

Engine oil is the lifeblood of your car. Low or dirty oil can lead to serious engine damage, so it’s important to check it regularly—every couple of weeks or at least once a month.

Warm and Shut Off the Engine:

Start the engine, let it run for a minute or two, then shut it off. Waiting about a minute allows the oil to settle, ensuring you get a more accurate reading.

Locate the Dipstick:

Many manufacturers make the oil dipstick handle bright yellow or orange, though this can vary. The stick itself is often labeled “Engine Oil.”

Pull, Wipe, and Reinsert:

Remove the dipstick and wipe it clean with a rag or paper towel. Reinsert it fully, then pull it out a second time to check the true level.

 Reading the Level:

Most dipsticks have two marks: “Full” (or an upper line/dot) and “Low” (or a lower line/dot).

The distance between these two marks typically represents about one quart (in many cars).If your oil is closer to the “Low” mark, you should add the appropriate type of oil (check your owner’s manual or oil cap for the correct viscosity).

Top Up, But Don’t Overfill:

Add small amounts at a time. If you overshoot the “Full” mark by a bit, it’s not catastrophic, but it’s wise to correct it soon.

Investigate Drops in Oil Level:

If you notice the oil level regularly dropping, make a note of how much it goes down and how quickly. This can indicate a leak or that the engine is burning oil, both of which need professional attention.

3. Checking Engine Coolant 

Engine coolant helps regulate your engine’s temperature. If it runs too low, your engine can overheat and suffer serious damage.

Coolant Reservoir vs. Radiator Cap:

Most modern cars have two spots for coolant: a radiator cap (directly on the radiator) and a plastic expansion or overflow bottle (reservoir).
The reservoir is the best place to check your coolant level, especially when the engine is hot. It usually has “FULL” and “LOW” markings on the side.

Look for the Level:

Coolant expands when hot and contracts when cold. If you check it cold, expect the level to be a bit below the “Full” line. If you check it hot, it may sit right at “Full.”

If It’s Low:

Only add coolant when the engine is cool (and never open the radiator cap if the engine is hot—pressurized, hot coolant can cause burns).
Always use the coolant specified for your make and model. It’s best to buy from the dealership or a reputable parts store to ensure compatibility.
Keep an Eye on Sudden Drops:

Coolant leaks can occur even when the engine’s off, so if you have to keep refilling frequently, get it checked out. A small leak can become a big issue if ignored.

4. Brake Fluid Basics

Your brake system depends on brake fluid to function properly. While brake fluid levels don’t fluctuate nearly as much as oil or coolant, you still want to keep tabs on it.

Reservoir Location and Levels:

The brake fluid reservoir is typically near the back of the engine bay, often on the driver’s side. You’ll see “Min” and “Max” or “Minimum” and “Maximum” lines on a translucent container.

No Need to Top Off (Unless It’s Below Minimum):


If your fluid is between the two marks, you’re good—even if it’s not right at “Max.”

Brake fluid naturally drops a bit as your brake pads wear. If you do fill it up to “Max” and then replace your brake pads, you risk overflow.

Brake Fluid Handling Warnings:

Brake fluid is extremely harsh on your skin and your car’s paint. If it spills onto paint, wash it off immediately with soap and water. Avoid opening the reservoir unnecessarily and always wear gloves if you do handle brake fluid.

Sudden Drops in Fluid:

If the level suddenly falls or sits below the “Min” line, have a mechanic look for leaks. Brake leaks are a serious safety issue.

5. Power Steering Fluid (If Your Car Has It)

Modern cars often have electric power steering, which means no fluid. However, many older and some current models still use hydraulic power steering fluid.

Hot vs. Cold Markings:

A typical power-steering reservoir may have “Hot” and “Cold” level lines. Check which matches your engine’s current state. If you’ve been driving for a while, it’s “Hot.” If the car’s been sitting overnight, it’s “Cold.”



Low Fluid Symptoms:

If you hear a whining noise whenever you turn the steering wheel, you might be low on fluid or have a leak. Don’t ignore these noises; running the system low can damage the power-steering pump.

6. Inspecting the Engine Air Filter

Your engine air filter keeps dirt, dust, and debris from entering the engine. Replacing it is usually straightforward and inexpensive.

Locate the Air Filter Housing:

In many cars, the air filter box is near the front corner of the engine bay, often held by clips or screws. Pull it open or unclip it to access the filter.

When to Change:

One side of the filter is the “dirty” side, and the other is the “clean” side. If you see heavy dirt, debris, or the filter looks clogged, it’s time for a replacement. A little dust or a few specks is not a crisis, so you can put it back and change it at your next opportunity.

Don’t Overclean a Worn Filter:

Blowing it out with compressed air can create small tears. New filters are relatively cheap, so when it’s dirty, just replace it.

7. Battery Care and Tips

Your battery supplies the juice to start your car and power accessories when the engine’s off.

When to Replace:

Most car batteries last around 4–5 years. After 5 years, consider replacing to avoid sudden failure—especially if you’re in a colder climate.

Date Labels:

If you don’t see a date sticker, just write the installation date on the battery with a permanent marker. That way, you’ll always know its age.

Corrosion:

White or bluish crust around the terminals is a sign of corrosion from battery acid vapors. You can gently brush it off or rinse it with water—just wear gloves and be careful not to get battery chemicals on your skin or your paint. Keeping terminals clean helps maintain a good electrical connection and prolongs battery life.

8. Closing the Hood Properly

Closing the hood may sound simple, but a few tips will help you avoid damage:

Remove Any Hood Supports or Clamps:

If you used a clamp to hold up worn hood struts, remove it first.
If you have a prop rod, stow it back in its retaining clip.

Don’t Slam from Too High:

Lower the hood to about a foot or so above the latch, then let it fall shut. This is similar to how you’d close a car door—firm but controlled. Pushing down on a half-latched hood can sometimes bend the panel, especially in older cars with thinner metal.

Give It a Gentle Tug:

Gently pull up on the hood afterward to ensure it’s fully latched and won’t fly open unexpectedly.

Final Thoughts

Spending a few minutes under the hood every couple of weeks can make a world of difference. Regularly checking oil, coolant, brake fluid, power steering fluid (if any), the air filter, and your battery helps you catch little problems early. If you find yourself topping off fluids often or spotting sudden drops, it’s time to consult a pro. Stay proactive, and you’ll enjoy a smoother ride, and fewer costly surprises on the road ahead.