Either that, or they operate like (I am convinced) many corporate repair shops do: begin with the most expensive repair on the list of likely suspects, and work their way down. It’s the ‘throw stuff at the wall and see what sticks’ methodology, and it’s lazy.
DH’s Honda had a fault in the a/c which caused it to switch off intermittently. The dealership wanted to replace most of the cooling system, beginning with the compressor and condenser for $1200. Our shadetree mechanic took 20 minutes to find the problem – a bad air gap in the clutch – and repaired it with 2 shims for $300.
