Anytime you have water damage to a vehicle there could be several item that needs to be replaced.
However they should be only replaced if there is an issue with that given components, not just because you might have gotten water.
See picture below for the transmission dipstick location. The fluid should be checked when the engine is at operating temperature.
Did they give you a written estimate? I am just curious of what they say it will need. Did they actually took a look at the car (put it on a lift or drove it)?
Sunday, September 12th, 2021 AT 10:04 AM