I completed a diagnostic call on a trane air conditioner upon my arrival customer advised me that suction line had been freezing. He had just changed the filter yesterday. Had a low suction pressure and a low superheat. I Found evap coil completely coated with particle build up restricting air flow through the coil. I Advised customer that we would have to schedule to return and pull the coil to clean it. Gave customer pricing, at this time customer wishes to hold off on having it cleaned. At time of departure system operational but suction line beginning to freeze.
