Disconnect the power to the dryer. Turn off the gas supply if it’s a gas dryer.
Remove the two hex-head screws with a nut driver holding the dryer’s bottom panel. Pulling out and down removes the panel from the dryer.
Remove the hex-head screw from the heater shield on the right-hand side of the dryer. Pull the shield free, and set it aside.
Pull the two wires off the high-limit thermostat’s terminals. The high-limit thermostat is mounted to the heater duct between the thermal cutoff sensor and the heater terminal block. The wires connected to it are red with a white stripe, and black.
Unscrew the two hex-head screws holding the thermostat to the heater duct. Pull the thermostat out of the duct.
Place a new thermostat in the heater duct, and then insert the hex-head screws in the mounting holes. Tighten the screws securely.
Connect the two wires to the thermostat terminals. Place the heat shield in its mounting location. Secure it with the hex-head screw.
Slide the top edge of the dryer panel under the dryer’s front panel and swing the bottom back against the dryer frame. Insert and tighten the two hex-head screws.