I own an old but still very reliable Volkswagen Passat CC. Recently, I've been experiencing a terrible vibration, which I suspect is due to my tires. The dealer attempted many times to balance my tires. I've spent a lot of money to get rid of the shaky feeling but to no avail. I even had to replace my tires with new ones, but it only made the vibration worse. What should I do?

The vibration that you are experiencing with your vehicle is due to the tires. This happens when your tires are not that balanced. The shakes, which can also be accompanied by a noise, worsen as you increase your speed. When this happens, you need to bring your vehicle to a tire store or a repair shop where you can have your tires checked. Have them check the balance of all of your wheels and tires and have them balanced as needed. You may also check if there is dirt or mud trapped in your wheels that could be causing the imbalance. You may try to buy tires from a different brand. Tires differ from one brand to another. Just make sure that you conduct a test drive when your tires have been replaced.

One morning when I was cleaning my vehicle, I noticed that there is a musty odor coming from the heating, ventilation, and air-conditioning (HVAC) system of my Volkswagen Passat CC. I wonder what's causing the smell since I ensure that my car is regularly cleaned and maintained. However, there's this strong, nasty smell from the vents. What should I do?

The nasty odor may be due to condensation in the heater case. This can cause a strong smell to come out from the vents. When this happens, you may opt to use an anti-bacterial spray and spray it directly on the vents. If the odor stays, you may opt to check the drain system for debris. If you are not comfortable to check it on your own, you can always take it to your trusted technician. There are also available cleaners for the heater case that you can use to eliminate the odor.

My vehicle has developed a carbon buildup when I reached 35,000 miles. The error codes showed malfunctions in the intake manifold. I brought the vehicle to the dealer, and they readily replaced the manifold. I had to pay for the carbon buildup cleaning. Is this normal?

At the rate that you are going, a carbon buildup is possible. Although it usually occurs when your vehicle reaches more than 56,000 miles, it depends on how you maintain your car. Carbon buildup causes your vehicle to be sluggish and even lose power. It can also significantly degrade fuel efficiency, making your vehicle get fewer miles that it should be getting. It was a good move to have it cleaned by an expert to avoid further problems. You just saved yourself thousands of dollars by keeping your vehicle safe from engine damage and high fuel consumption.

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