While electric cars will require much less maintenance and servicing than we've been used to, the fact is that petrol, diesel, and hybrid cars will still be on our roads for many years to come. It’s therefore a good idea to get clued up about what's going on under your bonnet. In fact, in one sense, it’s a legal requirement.
That legal requirement relates to the windscreen washer reservoir, but we’ll come to that in a moment. First, you need to open the bonnet.
Usually, this involves pulling a small lever or flap, which in almost all cars is located at the bottom of the front door pillar, down by the feet of either the driver or the front-seat passenger. In some models, it’s positioned under the steering column. Pulling it releases the first bonnet catch, causing the leading edge of the bonnet to pop up slightly.
Next, you need to release the safety catch, which prevents the bonnet from flapping backwards into your windscreen while driving if not closed properly. In most cars, this safety catch is a small lever or flap located just under the leading edge of the bonnet.
@breakingnews.ieSomething every Irish driver should know – what to look for under the bonnet. Neil Briscoe explains the basics of modern car ownership and maintenance. For the full story, visit breakingnews.ie♬ original sound - breakingnews.ie
You’ll either push it to one side or squeeze it upwards. In some vehicles, the safety catch is released by a second pull of the initial lever inside the car. If this is the case, the lever typically has an 'X2' logo, indicating it must be pulled twice.
Now, open the bonnet. Some cars have gas-filled struts, which automatically hold the bonnet open, while others have a simple steel strut, often highlighted with brightly coloured plastic trim. Unclip this strut and slot it into a hole indicated by an arrow beneath the bonnet surface to keep it open.
The first and most common check—and the one specifically required by law—is your windscreen washer fluid. This reservoir is usually identified by a lid in bright blue or yellow with an image of water spraying onto a windscreen.
It is legally required to be able to clean your windscreen during driving to maintain clear visibility, and failing to do so is an offence.
Ensure your windscreen washer fluid is topped up regularly, using concentrated or pre-mixed screen wash for optimal results. Never use household washing-up liquid, as it can smear the windscreen and damage your paintwork.
Next, check your engine oil. Traditionally, this is straightforward and still is in some cars.
Locate the ring-shaped handle of the dipstick, remove it, wipe the long metal blade clean with a cloth or kitchen towel, reinsert it fully, and then remove again to check the oil level. Most dipsticks have two notches at the end; ideally, the oil level should be halfway between these marks.
However, many modern cars no longer include a dipstick and rely on electronic sensors to measure oil levels, often warning you only when levels are dangerously low. This practice is less than ideal, as it prevents proactive maintenance and introduces potential sensor inaccuracies. A traditional dipstick remains a reliable solution.
If you need to top up your oil, remove the oil filler cap, typically marked with a yellow image of an oil can. Use a funnel to avoid spills when adding oil.
Next, check the engine coolant, which is a visual inspection. Coolant is stored in a large round reservoir containing brightly coloured liquid—usually pink—comprising water, anti-freeze, and coolant.
Check that the coolant level is between the marked max and min indicators. Exercise caution when topping up, as the liquid can be hot. Ensure you maintain the correct coolant mixture, especially during colder months.
Finally, inspect three additional areas: the power steering fluid, brake fluid reservoirs, and the battery. The fluid reservoirs have max and min markings, making the checks simple.
The battery check involves visually ensuring the battery terminals are secure and free from corrosion. Remember that some cars position the battery beneath the boot floor for weight distribution reasons, so you might have to check at the other end of your vehicle.
Always consult your car’s owner’s manual before performing these checks. The manual provides precise locations, correct levels, and recommended types of oil and coolant. If you're uncertain or concerned, contact your mechanic.
Lastly, ensure the bonnet is securely closed by lowering it onto the safety catch and pressing firmly on the front edge until it clicks securely into place.
