As a Master Certified Mechanic, former parts,warranty and service director with 36 years of experience, this is my input.
Look for a Certified Mechanic,with the most certification. Master Certified preferred.
Anyone can claim to be a mechanic. Poor diagnosis is a big problem.
Vehicles are very complicated and hard to work on. Just because a thermostat can be checked easily on one type of vehicle, this is not inclusive of all vehicles.
The biggest common factor in service issues boil down to one common denominator. The majority of mechanics are paid on a commission only basis.They are encouraged by their bosses to sell work, because the boss is paid on a commission basis.
If Mechanics were paid $20-$25 an hour, the quality of work would go up and selling unessessary work would disappear. Mechanics have to beat the Flat Rate clock.
If a mechanic road test a vehicle, puts it on a lift and pulls all four wheels to inspect the brakes, that is 15 minutes. He then goes to the service advisor and informs the advisor what needs to be fixed.
The service advisor calls the vehicle owner and discusses the repair. Another 15 minutes go by. The mechanic waits for the parts . If they are in stock on the shelf, 10 minutes go by.If not, he waits 20 minutes or more for the parts to be acquired.
The mechanic only gets paid one hour to do the job and road test the vehicle.When the mechanic gets the parts he quickly slaps the brake pads on the car and parks it outside. He is lucky if he beat the Flat Rate clock for that job.Thats the problem with cars repairs being done properly.
If the average salary of a mechanic is $30-$35k per year {according to the US Labor Board} then they are not beating the Flat Rate clock on a regular basis
Mechanic average between $300-$400 dollars a month in tool bills. Buying a special tool to remove an Acura front pulley, or special cam tool that might only be used less than a dozen times to mechanic employed by an independent shop .
Most shops expect the mechanics to buy any tool needed for a job if it cost $1000 or less. If the tool is more than that, the shop makes the decision to buy the tool or sublet out the job to a shop that has already purchased that tool.
I have $80,000 -$100,000 worth of tools. Due to model changes and different technology, I would say over half those tools are obsolete and worthless. I recently purchased a Torque wrench that has to be used to accurately torque in degrees, not foot lbs. $500 was the price of this special tool.