look at here now from your outside unit. This sort of fluids can suggest that there is one thing a lot more really serious going on Within the device alone.This may sign a bad lover belt inside the blower. Whether it is, that belt must get replaced. The audio also might signify the motor needs lubricant—which you might or might not be capable to do yourself based on the furnace make and design.One more common HVAC sound is rattle. This may signify that your compressor is failing. It also linked here could a pulley with failing bearings. Or it could be a worn-out compressor clutch. Anybody of these issues warrants the attention of an HVAC technician.