ALT-8 How to Deal with Auto Mechanics
If you've picked the right mechanic, there is very little dealing to have to do. However, every mechanic is in business to make money from the cash that now resides in your pocket. The problem for most people is that they know so little about most to the mechanical problems on their cars that they can't tell when their being lied to or when they've heard the truth.
There are certain parts on all cars that if they are bad, they are unsafe. Most of the front end and steering parts fit this. If you have electronic problems, your car may do strange things as your computer takes over control with bad information. That's scary. Most auto shops know your worries about catastrophes from mechanical or electrical failures. If they can shake something or convince you that it needs two parts to fix one, their profits go skyward.
You need to challenge them. If your car is drivable and the price of repairs is high, take it somewhere else for a second opinion. The $30-$75 spent may be just what's needed to save $500. If not, at least you can feel comfortable with canceling the next vacation.
If you are concerned, ask to see the old part and have the new one pointed out on the car. If the problem isn't fixed, it would be good if you got it in writing that the part would fix the car or the repair would be at no charge. Make sure that if more repairs are needed, that the only cost is parts or a very minimal labor charge.
However, if you trust the mechanic and have been a long time customer, you probably don't need any of the above. Most business people reward loyalty with reputable service.