Mary Q Superior , WY October 18, 2014 Belt tensoner Went thru the cover hole for air discharge 4 screws one screw holds tensoner and diconect the spring discard old unit start screw for new part hook up spring start belt over tensoner pully and rase to vertcal with your thumb or someone else reach ing past your arm put over motor pully replace vent and 4 screws plug into wall and enjoy Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes