- 1). Disconnect the power to your furnace.
- 2). Open up the service hatch of your furnace. (Determine where the hatch is located using the instructions found on the furnace for most modern furnaces; if you still have the instruction manual it will also tell you how to open the service hatch.) Some service hatches are secured with thumbscrews, and some have regular screws that require a screwdriver. Usually there are four screws; unscrew them and lift off the service panel.
- 3). Identify the blower fan. The blower fan will usually be in its own cylindrical housing with a grate cover on each end, and may be either driven directly by a motor or connected to the motor by a belt. Consult the instructions printed on the furnace or on the inside of the service hatch cover to positively identify the blower.
- 4). Locate the oil ports at each end of the blower fan shaft, and squirt a small amount of SAE-10 nondetergent oil into each port.
- 5). Put the service door back on, and reconnect the power. Listen for the blower to come on. If the squeaking has not improved, consult your furnace service manual for troubleshooting options or call a furnace service provider.
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