Goodman Furnace Heater Element With Limit Switch B1037489S 11.70 x 9.50 x 9.00 Genuine OEM Replacement Fits Goodman GMC Janitrol. This is a Genuine OEM Goodman part. This heater element with limit switch (part number B1037489S) is for furnaces. Heater element B1037489S is the heat source for the furnace, and includes the limit switch that turns the blower on and off. Shut off t... - Goodman Furnace Heater Element With Limit Switch B1037489S 11.70 x 9.50 x 9.00 Genuine OEM Replacement Fits Goodman GMC Janitrol.