Be sure trip A is on the odometer,hold reset button down and turn key on,watch the slashes extinguishing itself,when the numbers comes back then let go off the button.
No need to remove the dash,just work behind the glove box,labor time is less than 2 hours,Temp switch is to cut off the compressor,prevent icing of the evaporator and blocking air flow.
There are two washer pump relays in this vehicle.When you want front to work the rear washer relay provides a ground path for front washer relay and same to use the rear washer.HTH.