How to Check Your Car's Fluid Levels at Home

A quick guide to checking your car’s oil, coolant, brake fluid and other essential fluid levels at home.

A quick guide to checking your car’s oil, coolant, brake fluid and other essential fluid levels safely at home.

Maintaining your car’s fluid levels is essential for its performance, safety and longevity. Luckily, you don’t always need a mechanic to carry out basic checks—you can inspect most fluids at home with minimal tools.

At Hon Car Service Southampton, we encourage drivers to take proactive steps in caring for their vehicles. This guide explains how to check your car’s essential fluid levels safely and easily.

Why checking your car’s fluids is important

Regular fluid checks can help prevent:

• Engine overheating
• Premature engine wear
• Brake failure
• Steering problems
• Unexpected breakdowns

If you’re looking for an MOT and car service near you or need professional maintenance advice, Hon Car Service is here to help.

1. Engine oil

How to check the engine oil

1. Park your car on a level surface and make sure the engine is switched off and cool.
2. Locate the dipstick, which usually has a yellow or orange handle.
3. Pull the dipstick out and wipe it clean with a cloth or paper towel.
4. Insert it fully, then pull it out again.
5. Check that the oil level is between the minimum and maximum marks.

Top tip: If the oil looks very dark, dirty or gritty, it may be time for an oil and filter change. You can book an oil change with Hon Car Service.

2. Coolant and antifreeze

How to check the coolant level

1. Only check the coolant when the engine is completely cool.
2. Locate the coolant reservoir. It is usually transparent and marked with minimum and maximum lines.
3. Check that the coolant level is between the two markings.

Important: Never remove the coolant cap while the engine is hot, as pressurised coolant could cause serious burns.

Low coolant can cause the engine to overheat and may indicate a leak. If you’re unsure, arrange a car inspection or service with a trusted professional.

3. Brake fluid

How to check the brake fluid

1. Locate the brake fluid reservoir, usually positioned near the back of the engine bay.
2. Check the markings on the outside of the reservoir.
3. Make sure the fluid is between the minimum and maximum lines.

Warning: Low brake fluid can be dangerous and may indicate worn brake components or a leak. If the level is low or you’re unsure about its condition, book a professional brake inspection.

4. Transmission fluid for automatic cars

How to check the transmission fluid

Some automatic vehicles have a transmission fluid dipstick similar to the engine oil dipstick. However, many modern cars require special equipment or a professional inspection to check the transmission fluid correctly.

Always follow the instructions in your vehicle owner’s manual.

Possible warning signs: Slipping gears, delayed acceleration, difficulty changing gear or unusual noises may indicate low, dirty or deteriorated transmission fluid.

5. Power steering fluid

How to check the power steering fluid

1. Locate the power steering fluid reservoir under the bonnet.
2. Use the built-in dipstick or check the minimum and maximum markings on the reservoir.
3. If required, use only the type of fluid recommended by the vehicle manufacturer.

Possible warning signs: Stiff, heavy or noisy steering can sometimes indicate low power steering fluid. Some modern vehicles use electric power steering and therefore do not have a power steering fluid reservoir.

6. Windscreen washer fluid

How to check the windscreen washer fluid

1. Locate the reservoir cap marked with a windscreen or washer symbol.
2. Open the cap and check the fluid level.
3. Top it up with a suitable screenwash mixture if required.

MOT tip: An empty windscreen washer reservoir or a washer system that doesn’t work properly could contribute to an MOT failure.

When should you ask a mechanic for help?

Although checking fluid levels at home is relatively simple, you should never ignore repeated fluid loss, warning lights, unusual smells or visible leaks. These symptoms may indicate a more serious problem that needs professional diagnosis.

Regular inspections and servicing can identify developing issues before they cause expensive damage or leave you stranded.

Trust Hon Car Service for expert vehicle maintenance

At Hon Car Service Southampton, we provide professional car servicing, MOT testing, inspections and repairs for all makes and models, including Mazda, Kia, Jeep and many more.

Looking for an MOT garage near you or need help checking when your MOT is due? Get an instant fixed-price quote or visit our Support Centre for assistance.