Tight enough so the drive sheave does not slip and the motor draws the correct amperage, but not so tight that the squirrel cage bearings are damaged. There is a belt tensioning measurement to use but you need the distance between the pulleys to use it properly. Try Google. -END An old rule of thumb is you should have about a half inch of deflection when pressed at the center with your finger. Works with most drive belts
you would like about a 1/4" give in the belt
If it is a serpentine belt the automatic tensioner will adjust the belt for you. If it is an older "V" type belt--there should be 1/2" "play" at the middle of the belt, between the pulleys.
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you can leave your furnace fan run continuos, it helps even the heat in the house, it also helps with condensation on windows.
The fan should run for about 3-5 minutes after the furnace shuts off to help distribute the remaining heat throughout the house.
Your furnace may be squealing due to a worn-out or loose fan belt, a malfunctioning blower motor, or lack of lubrication on moving parts. To fix it, you can try tightening or replacing the fan belt, lubricating the moving parts, or calling a professional HVAC technician for further inspection and repair.
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you should have three belts total. Going from the fan towards the distributer the first belt should be the power steering, then the actual fan belt, then the third belt is the alternator / a/c belt, i hope this is helpful for you! So for the answer to your question, there is one fan belt, the second belt in from the fan!
Belt too tight, or too loose, or drive pulleys out of alignment, or damaged.
The serpentine belt and the tensioner on a 300 SE motor is part of the fan system that controls all of the smaller motors on the front of the engine. The serpentine belt helps turn the alternator, power steering pump, water pump, and the fan. The tensioner is a pulley on this belt that helps to keep the belt tight enough to stay on, but not too tight to hinder operation.
The belt(s) are probably too loose or too tight. Either way will cause noise.
The furnace fan limiter switch is a safety device that regulates the temperature of the furnace by controlling when the fan turns on and off. It prevents the furnace from overheating by shutting off the fan if the temperature gets too high. This helps protect the furnace from damage and ensures safe operation.