How could I be sure that the air-conditioning system of a pre-owned Chevrolet C30 is still running well? What would be an easy way to check the air-con?
A practical way to do a quick A/C checkup is to set the air-conditioner to its max fan blower speed to gauge the cooling efficiency. If the air-conditioner is running fine, it shouldn't take a while before cold air is blown out of the vents. As you turn on the A/C, open the hood and raise it so that you can also listen to the compressor clutch, which should click in and out as the engine revs rise and fall. Check the compressor to see if it's running well. If everything checks out, then the air-conditioning system of the pre-loved vehicle is mostly likely in good working condition.
Why should I have the rotors turned? When should I consider having this done on my Chevrolet? Is there a limit to turning the rotors?
When brake rotors wear unevenly or start to warp, the surface won't be flat or parallel anymore. This could lead to poor braking performance or efficiency. To ensure that the brake rotors will retain their even, smooth surface, rotors are turned by shaving some of the metal surface through a lathe. The straight, smooth surface after turning won't only ensure better pad wear but will also enhance the vehicle's braking performance. The rotors are turned or resurfaced when the pads are replaced or the brakes are serviced, especially if the rotors' surface are worn out unevenly. This is considered a more practical option than having the rotors replaced every time the pads are changed. However, resurfacing or turning the rotors can only be done several times. You have to be sure that the vehicle's brake rotors are still within the safe or preferred level of thickness. Otherwise, they will break easily and may not provide decent braking performance as thinner rotors may overheat easily and cause brake fade.
The brakes of my Chevy are squeaking. Is this bad? Or is this just normal?
Brakes tend make some noise, so a little bit of squeaking isn't necessarily bad. The brakes may squeak when the vehicle is driven in a stop-and-go traffic or when there's a lot of dust on the road. When it's humid, the pads could glaze or harden. And as an effect, the friction surfaces may create some noise when in contact.
However, squeaking brakes can also be caused by crystallization, which would have an adverse effect on the pads. This may require the replacement of the altered pads to keep the brakes from making noise. Brake noise can also be a symptom of a brake problem. There can be a broken part somewhere that needs to be checked and repaired. If the brakes make so much noise or this happens a lot, the brake system should be inspected and serviced as needed. Find the weak link in the system. Don't ignore the warning for your own driving safety.