{"id":6004,"date":"2026-03-13T18:42:56","date_gmt":"2026-03-13T07:42:56","guid":{"rendered":"https:\/\/www.driverknowledgetests.com\/resources\/?p=6004"},"modified":"2026-03-13T18:47:30","modified_gmt":"2026-03-13T07:47:30","slug":"what-bad-sounds-could-your-car-make-and-what-does-it-mean","status":"publish","type":"post","link":"https:\/\/www.driverknowledgetests.com\/resources\/what-bad-sounds-could-your-car-make-and-what-does-it-mean\/","title":{"rendered":"What bad sounds could your car make, and what does it mean?"},"content":{"rendered":"\n<p>If you are hearing strange sounds from your vehicle, whether while preparing for a drive test or heading out for a lesson, it may be an indication that something is wrong. There are many things that you, as a driver, can and should do before these sounds become something more serious and require you to see a professional and get <a href=\"https:\/\/kendonautoelectrical.com.au\/our-services\/logbook-services\/\">car servicing in Preston<\/a> or beyond.&nbsp;<\/p>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;69efa683bb19b&quot;}\" data-wp-interactive=\"core\/image\" class=\"wp-block-image size-large wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"595\" height=\"332\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on-async--click=\"actions.showLightbox\" data-wp-on-async--load=\"callbacks.setButtonStyles\" data-wp-on-async-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/vehicle-noises-infographic-595x332.jpg\" alt=\"Infographic showing different noises your car can make, and what they might be caused by\" class=\"wp-image-6008\" srcset=\"https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/vehicle-noises-infographic-595x332.jpg 595w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/vehicle-noises-infographic-300x167.jpg 300w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/vehicle-noises-infographic-768x429.jpg 768w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/vehicle-noises-infographic-1536x857.jpg 1536w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/vehicle-noises-infographic-2048x1143.jpg 2048w\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"Enlarge\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on-async--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"state.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n\n\n\n<p>Let\u2019s look at some pre-emptive steps you can take as a driver to begin \u2018diagnosing\u2019 that strange sound before forking over for a professional to make sure your car can pass a driving test. Doing these checks will actually make your mechanic\u2019s life easier, too.<\/p>\n\n\n\n<p>The good thing is that when you regularly drive the same car, you have most likely become attuned to its noises, whether that be the rumble of the engine or the whirr of the heating vents, so it becomes much easier to notice any new ones. Here are some common noises and what their cause might be:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Scraping noise<\/h2>\n\n\n\n<p>Most common in older vehicles, and usually the brake components or wheel bearings are to blame.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"595\" height=\"397\" src=\"https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/mechanic-changing-brake-discs-car-service-595x397.jpg\" alt=\"\" class=\"wp-image-6005\" srcset=\"https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/mechanic-changing-brake-discs-car-service-595x397.jpg 595w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/mechanic-changing-brake-discs-car-service-300x200.jpg 300w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/mechanic-changing-brake-discs-car-service-768x512.jpg 768w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/mechanic-changing-brake-discs-car-service-1536x1024.jpg 1536w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/mechanic-changing-brake-discs-car-service.jpg 1920w\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">1. Stone or debris caught in the brake<\/h3>\n\n\n\n<p>This is <strong>very common<\/strong>, especially after driving on gravel roads.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sharp scraping sound when the wheel rotates<\/li>\n\n\n\n<li>Often happens suddenly<\/li>\n\n\n\n<li>May disappear when braking<\/li>\n<\/ul>\n\n\n\n<p><strong>How to fix<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Turn the steering wheel fully to expose the brake area (front wheels).<\/li>\n\n\n\n<li>Look between the <strong>brake disc (rotor)<\/strong> and the <strong>dust shield<\/strong>.<\/li>\n\n\n\n<li>Remove any stones or debris with a screwdriver or by tapping the shield lightly.<\/li>\n\n\n\n<li>If needed, slightly <strong>bend the dust shield away from the rotor<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p>An alternative is to drive in reverse and brake hard &#8211; this can pop the stones out of the front of the pads.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Brake pad worn down to metal<\/h3>\n\n\n\n<p>If the pad lining is gone, the <strong>metal backing plate scrapes the rotor<\/strong>.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Loud grinding noise when braking<\/li>\n\n\n\n<li>Noise gets worse quickly<\/li>\n\n\n\n<li>Reduced braking performance<\/li>\n<\/ul>\n\n\n\n<p><strong>Fix<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Replace the <strong>brake pads immediately<\/strong><\/li>\n\n\n\n<li>Rotor may also need machining or replacement.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Rust on brake discs<\/h3>\n\n\n\n<p>After rain or the vehicle sitting for a while, <strong>surface rust forms on the discs<\/strong>.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Scraping noise when first driving<\/li>\n\n\n\n<li>Usually disappears after a few brake applications<\/li>\n<\/ul>\n\n\n\n<p><strong>Fix<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Drive slowly and apply brakes a few times to clean the discs.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Bent brake dust shield<\/h3>\n\n\n\n<p>The thin metal shield behind the rotor can bend and touch the disc.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Continuous scraping sound that changes with speed<\/li>\n\n\n\n<li>Happens even when not braking<\/li>\n<\/ul>\n\n\n\n<p><strong>Fix<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Jack up the vehicle<\/li>\n\n\n\n<li>Locate the shield behind the rotor<\/li>\n\n\n\n<li>Bend it slightly away from the disc.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. Stuck brake pad or calliper<\/h3>\n\n\n\n<p>If the pad isn\u2019t retracting, it may drag on the rotor.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Scraping plus heat from the wheel<\/li>\n\n\n\n<li>Vehicle may pull slightly to one side<\/li>\n<\/ul>\n\n\n\n<p><strong>Fix<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove and clean the <strong>calliper slides<\/strong><\/li>\n\n\n\n<li>Lubricate with <strong>high-temperature brake grease<\/strong><\/li>\n\n\n\n<li>Replace seized components if necessary.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Rattling noise<\/h2>\n\n\n\n<p>Definitely the most annoying noise as it&#8217;s often constant, and can be due to a wide variety of things:\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"595\" height=\"397\" src=\"https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/modern-car-exhaust-detail-595x397.jpg\" alt=\"\" class=\"wp-image-6006\" srcset=\"https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/modern-car-exhaust-detail-595x397.jpg 595w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/modern-car-exhaust-detail-300x200.jpg 300w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/modern-car-exhaust-detail-768x513.jpg 768w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/modern-car-exhaust-detail-1536x1026.jpg 1536w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/modern-car-exhaust-detail.jpg 1920w\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">1. Loose exhaust or heat shield<\/h3>\n\n\n\n<p>This is <strong>one of the most common causes<\/strong>.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Metallic rattling under the car<\/li>\n\n\n\n<li>Worse when idling or accelerating<\/li>\n\n\n\n<li>Often disappears at higher speeds<\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Loose exhaust bracket<\/li>\n\n\n\n<li>Broken rubber exhaust hanger<\/li>\n\n\n\n<li>Heat shield vibrating against the exhaust<\/li>\n<\/ul>\n\n\n\n<p><strong>Fix<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tighten or replace hangers<\/li>\n\n\n\n<li>Secure heat shield with clamps or bolts.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Loose items in the car<\/h3>\n\n\n\n<p>Sometimes the noise is much simpler.<\/p>\n\n\n\n<p><strong>Examples<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coins or tools in door pockets<\/li>\n\n\n\n<li>Loose jack or spare wheel in the boot<\/li>\n\n\n\n<li>Loose number plate<\/li>\n\n\n\n<li>Mobile phone holder vibrating<\/li>\n<\/ul>\n\n\n\n<p>Always check the <strong>boot, glovebox, and door compartments<\/strong> first.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Worn suspension components<\/h3>\n\n\n\n<p>If the rattle occurs over bumps.<\/p>\n\n\n\n<p><strong>Possible causes<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn <strong>drop links (sway bar links)<\/strong><\/li>\n\n\n\n<li>Worn <strong>shock absorber mounts<\/strong><\/li>\n\n\n\n<li>Loose suspension bolts<\/li>\n\n\n\n<li>Worn <strong>ball joints<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rattle or knocking over rough roads.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Loose brake components<\/h3>\n\n\n\n<p>Brake pads or callipers can rattle.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rattle when driving slowly<\/li>\n\n\n\n<li>Noise may disappear when pressing the brake pedal.<\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn pad clips<\/li>\n\n\n\n<li>Loose calliper hardware.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. Engine-related rattles<\/h3>\n\n\n\n<p>If the noise comes from the engine bay.<\/p>\n\n\n\n<p><strong>Possible causes<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Loose engine cover<\/li>\n\n\n\n<li>Loose air intake parts<\/li>\n\n\n\n<li>Worn timing chain (more serious)<\/li>\n<\/ul>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rattle at idle or during acceleration.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6. Loose interior trim<\/h3>\n\n\n\n<p>Plastic panels can vibrate.<\/p>\n\n\n\n<p><strong>Examples<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dashboard trim<\/li>\n\n\n\n<li>Door panels<\/li>\n\n\n\n<li>Centre console pieces.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">7. Loose wheel components<\/h3>\n\n\n\n<p>More serious but possible.<\/p>\n\n\n\n<p><strong>Examples<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Loose wheel nuts<\/li>\n\n\n\n<li>Loose hub caps.<\/li>\n<\/ul>\n\n\n\n<p>Always check wheel nuts if you hear a new rattle after wheel work.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Clicking and clunking noises<\/h2>\n\n\n\n<p>From low engine oil to a faulty CV axle (joint), there are many reasons why your vehicle may be making a clicking sound; one single click may be caused by a defective starter motor, while repeated clicking may be due to a faulty alternator or battery.\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Worn CV joint (very common)<\/h3>\n\n\n\n<p>This usually happens in <strong>front-wheel drive vehicles<\/strong>.<\/p>\n\n\n\n<p>Drivetrain components can create clunks and clicks when worn.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clunk when <strong>accelerating or changing direction<\/strong><\/li>\n\n\n\n<li>Sometimes when <strong>shifting from reverse to drive<\/strong><\/li>\n\n\n\n<li>Rapid clicking when <strong>turning<\/strong>, especially during acceleration<\/li>\n\n\n\n<li>Noise comes from the <strong>front wheels<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>constant velocity (CV) joint<\/strong> is worn or the protective rubber boot has split and lost grease.<\/li>\n<\/ul>\n\n\n\n<p><strong>Fix<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Replace the <strong>CV joint or driveshaft<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Low engine oil or valve noise<\/h3>\n\n\n\n<p>Clicking from the <strong>engine<\/strong> can indicate valve train noise.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"595\" height=\"397\" src=\"https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/engine-piston-cross-section-595x397.jpg\" alt=\"\" class=\"wp-image-6007\" srcset=\"https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/engine-piston-cross-section-595x397.jpg 595w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/engine-piston-cross-section-300x200.jpg 300w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/engine-piston-cross-section-768x512.jpg 768w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/engine-piston-cross-section-1536x1025.jpg 1536w, https:\/\/www.driverknowledgetests.com\/resources\/wp-content\/uploads\/2026\/03\/engine-piston-cross-section.jpg 1920w\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><\/figure>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clicking or ticking at <strong>idle or when revving<\/strong><\/li>\n\n\n\n<li>Noise from the <strong>top of the engine<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Possible causes<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Low oil level<\/li>\n\n\n\n<li>Worn lifters or valves<\/li>\n<\/ul>\n\n\n\n<p><strong>Fix<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check and top up <strong>engine oil<\/strong><\/li>\n\n\n\n<li>If it continues, it may need mechanical inspection.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Loose or worn brake components<\/h3>\n\n\n\n<p>Brake pads or clips can make a clicking sound.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clicking when <strong>braking or releasing the brake<\/strong><\/li>\n\n\n\n<li>Sometimes when changing direction (forward to reverse)<\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pads shifting slightly in the caliper.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Stuck relay or electrical component<\/h3>\n\n\n\n<p>Electrical parts can click.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clicking from dashboard or fuse box<\/li>\n\n\n\n<li>Happens when turning ignition on or using accessories<\/li>\n<\/ul>\n\n\n\n<p><strong>Common causes<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faulty relay<\/li>\n\n\n\n<li>Weak battery.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. Cooling exhaust parts<\/h3>\n\n\n\n<p>After turning the engine off, the exhaust may click.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clicking sound <strong>after parking the car<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Normal <strong>metal expansion and contraction<\/strong> as the exhaust cools.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6. Worn suspension joints<\/h3>\n\n\n\n<p>If the clicking occurs over bumps.<\/p>\n\n\n\n<p><strong>Possible causes<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn <strong>ball joints<\/strong><\/li>\n\n\n\n<li>Worn <strong>drop links<\/strong><\/li>\n\n\n\n<li>Loose suspension bolts.<\/li>\n\n\n\n<li><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Hissing noise<\/h2>\n\n\n\n<p>A <strong>hissing noise in a car<\/strong> usually means <strong>air, gas, or fluid escaping under pressure<\/strong>. Some causes are normal, while others may indicate a problem. The timing of the noise helps identify the cause. \ud83d\ude97\ud83d\udd27<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Vacuum leak (common cause)<\/h3>\n\n\n\n<p>Modern engines use <strong>vacuum hoses<\/strong> for many systems.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hissing sound from the <strong>engine bay<\/strong><\/li>\n\n\n\n<li>Rough idle or poor engine performance<\/li>\n\n\n\n<li>Engine warning light may appear<\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cracked or disconnected <strong>vacuum hose<\/strong><\/li>\n\n\n\n<li>Leaking <strong>intake manifold gasket<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Fix<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inspect and replace damaged hoses.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Cooling system leak<\/h3>\n\n\n\n<p>Pressurised coolant can create a hissing noise when escaping.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hissing from under the bonnet<\/li>\n\n\n\n<li>Steam or coolant smell<\/li>\n\n\n\n<li>Engine temperature rising<\/li>\n<\/ul>\n\n\n\n<p><strong>Possible causes<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Radiator leak<\/li>\n\n\n\n<li>Split coolant hose<\/li>\n\n\n\n<li>Faulty radiator cap.<\/li>\n<\/ul>\n\n\n\n<p>If the engine is overheating, stop driving.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Air conditioning system<\/h3>\n\n\n\n<p>The <strong>A\/C system<\/strong> may hiss when operating.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hissing when the <strong>air conditioning is switched on<\/strong><\/li>\n\n\n\n<li>Noise from dashboard vents<\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Refrigerant moving through the system (often normal).<\/li>\n<\/ul>\n\n\n\n<p>However, constant loud hissing may indicate a <strong>refrigerant leak<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Brake system vacuum leak<\/h3>\n\n\n\n<p>The <strong>brake booster<\/strong> uses vacuum to assist braking.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hissing when pressing the <strong>brake pedal<\/strong><\/li>\n\n\n\n<li>Brake pedal feels <strong>harder than normal<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Brake booster leak or hose damage.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. Steam or pressure after engine shutdown<\/h3>\n\n\n\n<p>Sometimes you may hear a brief hiss after turning the engine off.<\/p>\n\n\n\n<p><strong>Cause<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cooling system releasing pressure<\/li>\n\n\n\n<li>Normal heat expansion.<\/li>\n<\/ul>\n\n\n\n<p>But continuous hissing could indicate a <strong>coolant leak<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. Tyre leak<\/h3>\n\n\n\n<p>Air escaping from a tyre can produce a hissing sound.<\/p>\n\n\n\n<p><strong>Symptoms<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tyre slowly losing pressure<\/li>\n\n\n\n<li>Hiss near a wheel<\/li>\n<\/ul>\n\n\n\n<p>Noises are the first signs that something is wrong with your car, especially with key components. If you are still not sure what is causing the strange noise, then it is important to book a diagnostic test with a professional as soon as possible.&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you are hearing strange sounds from your vehicle, whether while preparing for a drive test or heading out for a lesson, it may be an indication that something is wrong. There are many things that you, as a driver,<span class=\"ellipsis\">&hellip;<\/span><\/p>\n<div class=\"read-more\"><a href=\"https:\/\/www.driverknowledgetests.com\/resources\/what-bad-sounds-could-your-car-make-and-what-does-it-mean\/\">Read more &#8250;<\/a><\/div>\n<p><!-- end of .read-more --><\/p>\n","protected":false},"author":79,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[3],"tags":[229],"class_list":["post-6004","post","type-post","status-publish","format-standard","hentry","category-advice","tag-mechanical-advice"],"_links":{"self":[{"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/posts\/6004","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/users\/79"}],"replies":[{"embeddable":true,"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/comments?post=6004"}],"version-history":[{"count":1,"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/posts\/6004\/revisions"}],"predecessor-version":[{"id":6009,"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/posts\/6004\/revisions\/6009"}],"wp:attachment":[{"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/media?parent=6004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/categories?post=6004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.driverknowledgetests.com\/resources\/wp-json\/wp\/v2\/tags?post=6004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}