Detecting Vehicle Issues Through Smells

Hot weather and long drives make summer the perfect time for road trips, but they also bring out some unpleasant vehicle smells that should not be ignored. From musty air conditioning to burning fluids, your nose can be one of your best tools for detecting vehicle issues early. In this month's blog post, we examine common summer vehicle odors and what you should do about them.

Musty A/C? Mold Might Be Lurking

If your air conditioner smells damp or musty when you turn it on, it's likely due to mold or mildew buildup in the system. Moisture collects in the air conditioning evaporator, creating the perfect environment for bacteria and mold—especially in humid summer months.

• What to do: Try running the fan on high without A/C for a few minutes before shutting off the car. This helps dry out the evaporator. If the smell persists, replacing the cabin air filter and using an antibacterial spray on the system can help.
  

Burning Smell? Check Your Fluids

A burning odor under the hood can signal a fluid leak, overheating engine, or worn-out transmission. Hot weather puts extra strain on fluids, making leaks more noticeable and causing lower fluid levels to increase friction and heat.

• What to do: Check for visible leaks under the car and monitor fluid levels regularly—especially coolant, engine oil, and transmission fluid. If you notice a persistent burning smell, have a service professional inspect the vehicle immediately to prevent further damage.
  

Hot Brakes? Overheating or Wear

A sharp, burning rubber smell after driving could mean your brakes are overheating or wearing down. This often happens in stop-and-go traffic or downhill driving when brakes are used more aggressively.

• What to do: If the smell occurs frequently, check your brake pads and rotors for excessive wear. Overheated brakes reduce stopping power, so if the pedal feels soft or vibrations occur when braking, get them checked immediately.
  

Rotten Egg Smell? Could Be Your Battery

A sulfur-like odor inside or near the engine bay may indicate a failing battery or issues with the fuel system. In extreme heat, batteries can overheat, leaking sulfuric gas and leading to electrical failures.

• What to do: Inspect the battery for corrosion or leaks, and if you suspect an issue, replace it before it leaves you stranded. If the odor comes from the exhaust, get the catalytic converter checked.
  

Your vehicle's smells tell a story and ignoring them can lead to costly repairs or breakdowns. Stay ahead of summer vehicle troubles by recognizing the warning signs and taking preventive action. That way, you can enjoy the road without unexpected mechanical surprises.