CVT Transmission Trouble, Take Care of Your Coolant, Suspicious Vehicle Sounds
WCCO's Car Care
WCCO's Car Care Apr 11, 2026
CVT Transmission Trouble, Take Care of Your Coolant, Suspicious Vehicle Sounds

CVT Transmission Trouble, Take Care of Your Coolant, Suspicious Vehicle Sounds

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CVT Transmission Trouble, Take Care of Your Coolant, Suspicious Vehicle Sounds
Term

CVT

CVT means the car uses a transmission that can smoothly change “gears” without distinct steps. It’s designed to keep the engine running efficiently, but it can have issues if it isn’t maintained.

Part

ball joints

Ball joints are suspension joints that allow controlled movement between the steering knuckle and suspension arms. Pothole impacts can accelerate wear, leading to looseness, vibration, or uneven tire wear.

Part

control arms

Control arms are part of the suspension that holds the wheel in the right position. If they’re bent or worn from a pothole, the car can handle poorly and tires can wear faster.

Concept

adjust for acceleration, speed, load

The CVT constantly “decides” what ratio to use based on how hard you’re pressing the gas and how fast you’re going. That’s how it stays smooth while you accelerate.

Term

shocks

Shocks are part of your suspension that help smooth out bumps. When they wear out, the car can bounce more and feel less stable.

Term

struts

Struts are like shocks, but they also help support the suspension. If they wear out, the ride can get rough and the car may handle differently.

Concept

bounce return test

This is a simple way to check suspension health. If you push down and the car keeps bouncing or doesn’t settle smoothly, the shocks or struts may be worn out.

Term

changing the fluid

Changing the fluid means replacing the transmission’s working fluid. For a CVT, clean fluid helps it shift smoothly and can help prevent expensive problems later.

Concept

salt and snow corrosion

Road salt and snow can get into the gaps around buttons and wiring. Over time that can cause corrosion and make the button stop working.

Term

circuit

A circuit is the car’s electrical “wiring network” for a feature. If one button doesn’t do anything, the problem is often in the wiring or the switch that sends the signal.

Term

key fob

A key fob is the remote you use to control your car from a distance. If the remote works but one button or feature doesn’t, the issue is usually inside the car—like a switch or wiring—not the remote itself.

Mazda Cx70
Car

Mazda Cx70

A Mazda CX-70 is the vehicle being discussed. They’re saying the coolant level drops and they have to add coolant after driving a while, and they want to know if that’s normal.

Term

turbo

A turbo helps the engine make more power by pushing extra air in. Because it can run hotter, keeping the cooling system working properly matters.

Term

coolant

Coolant is the fluid that keeps your engine from getting too hot. It also helps protect against corrosion, and it can wear out or change over the years.

Term

hoses

Coolant hoses are the rubber tubes that move coolant around the engine. Older hoses were more likely to fail, but newer materials usually last longer.

Concept

hybrid vehicles

A hybrid uses both gas and electricity. The electric parts aren’t as big as in a full electric car, but the basic idea is similar.

Concept

battery

The battery stores the electricity that powers the car. Keeping it at the right temperature is important, and that’s one reason EVs can be more complex to service.

Concept

electric motors

Electric motors are what move the car using electricity. They can get hot, so the car needs cooling and monitoring to keep everything working safely.

Concept

multiple fuses for related systems

Even if you check one fuse, the radio might still be powered through another fuse. That’s why it helps to check all the fuse spots listed for the radio in the owner’s manual.

Term

owners manual

The owner’s manual tells you which fuse goes with which system and where that fuse is located. It saves time because you don’t have to guess which fuse might be responsible.

Concept

isolate that rubber bushing, that grommet, that pivot point

Noise diagnosis often focuses on suspension and body mounting points where rubber bushings, grommets, and pivot joints allow movement. If rubber dries out, wears, or loosens, it can create clinks, squeaks, or rattles—sometimes without major part failure.

Term

catalytic converter

The catalytic converter helps clean the exhaust. If it’s failing, the check engine light can come on, and repairs can be costly.

Part

transmission fluid

Transmission fluid lubricates and helps control hydraulic functions inside the transmission. When it’s low due to a leak, the transmission can overheat and suffer internal wear, which is why topping it up after fixing the leak matters.

Term

swelled up

If the battery case looks puffy or swollen, that’s a warning sign. It usually means the battery is failing and should be replaced.

Term

oil viscosity

Viscosity is basically how thick the oil is. Thicker and thinner oils behave differently, especially when it’s cold, and that affects how well the engine protects itself and how much fuel it uses.

Term

oil filters

An oil filter cleans the oil as it circulates through the engine. Eventually it gets clogged with dirt, so it has to be replaced on schedule.

Term

bypass

Bypass is a safety path that opens when the filter is too clogged. If that happens, some dirt may not get filtered out as well.

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