What Car Smells, Noises, and Vibrations Mean for Phoenix Drivers

Reviewed by Eric Shepherd, Gemba Automotive ASE-Certified Technician

Vehicles driving around the Valley of the Sun deal with harsher conditions than many other parts of the country. At some point, most Phoenix drivers have probably experienced that moment where something feels "off" halfway through your commute on the 303, shaking at 75 mph, burning smells while idling along the I-17, or brakes squealing loud enough to echo through a grocery store parking lot in July. Vehicles have many components that experience extra stress and strain during the warm summer temperatures.

At Gemba Automotive, we see vehicles routinely come into our eight valley locations with drivers experiencing strange smells, new vibrations at highway speeds, or unusual noises. Most of the time these can be signs that something needs to be addressed, but many drivers often ignore the warning signs until they end up stranded on the side of the 202 waiting for a tow truck while the outside temperature reads 115-degrees and your car's A/C slowly gives up.

Understanding what your vehicle is trying to tell you can help you avoid breakdowns, improve the safety for those who ride with you, and help prevent minor repairs from turning into larger ones. Here are some of the most common smells, noises, and vibrations that we see at Gemba Automotive, and what they might be telling you.

What Squealing Brakes Usually Mean

We have all been there … you're leaving the Costco or Target in the middle of summer when you tap the brakes and your car screams so loud that everyone turns to stop and stare. Brake squealing is one of the most common sounds Phoenix drivers experience and, in most cases, it just means it's time to replace your brakes.

Many modern brake systems include pads that contain a small metal wear indicator. The indicator is specifically designed to make noise when it contacts the rotor, indicating that the pads have become too thin and it's time to replace them. The squealing is your car telling you it's time for some new pads before the issue becomes worse.

Stop-and-go traffic on I-10 during rush hour is brutal on brakes, especially when the pavement itself feels hot enough to cook on. Mountain driving and towing can also impact this. We have seen that when excessive heat builds up on the brake pads, they wear down quickly and it increases the chance the rotors will warp over time.

That said, there are situations when brakes may squeal and it's not due to wear. Sometimes if dust or debris are trapped between the rotor and the pad the brakes will make noise, this is one of the most common causes we have seen in our dry and dusty climate. In the rare chance it rains, or during monsoon season, moisture buildup can also cause squealing. Other possible causes include glazed brake pads from excessive heat or low-quality brake pads.

If the noise seems to be temporary, and it occurs only in the mornings or just after driving through a dust storm, then it's likely to be moisture or dust related. If you notice the sound happens every time you press the pedal, regardless of environmental factors, it's time to have them inspected.

Let's say for whatever reason, your vehicle skips over the squealing stages, and we jump right to grinding noises. Grinding noises during braking usually indicate the pads have worn down completely and metal components are contacting the rotors. At this point the rotors will most likely need to be replaced along with the pads.

While brake pad squealing is a great warning, you should also pay attention to how the pedal feels when you push it as that can sometimes tell you more information about what is going on. For example, if it feels soft, there is pulsating, its spongy or unusually hard, it could indicate a hydraulic issue, air in the brake lines, worn rotors or other failing components.

Burning Smell in Your Car? Here's What Causes It

Few things get our attention faster than a burning smell coming through the vents while sitting at a red light in August. The tricky part is knowing if it is coming from your own vehicle, or one nearby, and what the smell means.

To determine if the smell is coming from your car or one nearby, we recommend stopping to pull over and wait a few minutes for the cars around you to get a distance away. If you notice the smell while your pulled over or if it comes back when you resume driving, it could be you.

The smell of burning rubber comes from more than just massive burnouts and donuts on the track. It often indicates something physically rubbing when it shouldn't be. In our experience, the usual suspects include a slipping serpentine belt, a loose rubber hose touching a hot engine component, electrical wiring, or a tire rubbing from possible suspension damage.

Burning oil has a pretty distinct smell - its sharp and smoky. The most common cause is when oil leaks onto hot engine components. Common areas include valve cover gaskets, oil filter, oil pan gasket and worn engine seals. Another common cause could be if the engine was overfilled and during the last oil change. It's also common to experience oil leaks as the rubber seals dry out from constant heat exposure.

If you smell something sweet and you're not near a bakery, it's possible you are smelling burning coolant. Sometimes the smell goes hand-in-hand with your engine temperature rising which could mean the cooling system is failing. Since the heat in Phoenix already pushes the cooling system to the max, it's important to check for radiator leaks, cracked hoses, a water pump failure, heater core leaks and inspect the coolant reservoir for any damage. In Phoenix heat, even small cooling system weaknesses tend to become noticeable very quickly. Burning electrical components often smell like melting plastic or hot wiring. Usually, this smell means the alternator is failing, there is a blown fuse somewhere, damaged wiring, battery issues or overheated electrical circuits. Electrical issues pose a real risk to drivers as they can escalate quickly and are potential fire risks.

Why Your Car Vibrates While Driving or Braking

If you have driven on the recently diamond-grated 51 freeway, you know that all vehicles naturally produce some level of vibration, be it from the road you are traveling on, or something has mechanically changed.

If the steering wheel shakes at highway speeds, the most common causes are tire imbalance, uneven tire wear, bent wheels, or alignment issues. Potholes, curbs, construction zones and of course, the scorching pavement temperatures all contribute to tire wear and wheel damage. In most of these cases, a tire balance can solve the problem, but if the vibration worsens over time, it could indicate suspension or component wear.

If the vehicle is shuddering or vibrating only when the brake is applied, there is a good chance that the rotors are warped. Many drivers come into our shop with comments about the brake pedal pulsing, steering wheel shake during braking or shuddering at high speeds. Arizona drivers coming back down from Flagstaff or Payson often notice brake vibrations after long downhill grades that put extra heat into the braking system.

Sometimes vibrations can be felt through the seat or the floor. Vibrations felt through the seat often point to a bad tire, driveshaft issue, or suspension damage. Other common possible causes we have experienced include bad engine mounts and transmission problems. If the vehicle is rear-wheel-drive, the vibration could be caused by a driveshaft imbalance or worn universal joints.

One of the other common things we see in our shop is when the vehicle only vibrates while stopped at red lights or idling. This often points to an engine-related vibration. There are several reasons why it could do this, including worn motor mounts, engine misfires, vacuum leaks, fuel system problems and dirty spark plugs. Phoenix heat can worsen ignition and fuel systems over time because the high temperatures place additional stress on engine electronics and combustion systems.

What Clicking Noises from Your Car Usually Mean

Clicking noises may seem minor, but they often mean that there is some mechanical wear and it could get worse if ignored.

Clicking during turns often points to worn CV joints or damaged CV axles which allow power to transfer to the wheels while turning. Protective rubber boots hold grease inside the joint and once those boots crack or tear - something Phoenix heat can accelerate - grease escapes and dirt enters the joint.

Clicking under the hood could be due to low engine oil, valve train wear, fuel injector noise or exhaust leaks. If loud ticking or clicking changes with engine speed, it could indicate lubrication issues or internal engine wear. Because Arizona heat places extra strain on engine oil, maintaining proper oil levels and getting regular oil changes becomes especially important.

Clicking during startup generally means that the battery or the starter is dying. Phoenix heat is notoriously hard on car batteries as it speeds up the chemical breakdown within the battery.

How Small Car Problems Turn into Major Repairs

Vehicles are complex, but they still communicate when a problem is rising with sounds, smells, vibrations, and changes in basic performance. A mistake we see many drivers make is waiting until the problem leaves them stranded or becomes a significant issue. Early diagnosis can prevent more serious damage. For Arizona drivers, the hot desert climate pushes our vehicles year-round and paying attention to what your car is trying to tell you can go a long way with preventative maintenance and save you from getting stranded in 100-degree weather.