The frost was building up on the evaporator and the freezer wasn't cooling very well Rex W. • Sheridan, WY • March 24, 2015 Appliance: Amana Ref-SXS/I&W ARS2664BW My Repair & Advice I removed the shelves and the shelf holders, took the back panel off, loosened the evaporator. Removed the heater element and the thermostat. Re-installed the evaporator the back panel, shelve holders and shelves. Then I located the defrost timer in the refrigerator. Was this review helpful to you?