On engines with belt-driven cooling fans, a fan clutch is often used to save energy and reduce noise. The fan clutch disengages slows or disengages the engine's cooling fan when extra cooling isn't needed. The fan pulls air through the radiator and air conditioning condenser when the vehicle isn't moving fast enough to provide adequate airflow for cooling.
St Augustine grass will go dormant when the soil temperatures fall below 55 degrees. If the soil remains warmer than 60 degrees all year, the grass will stay green. It will, however, slow in growth as the soil drops in temperature. Disadvantages of St Augustine grass. One of the disadvantages of St Augustine grass is its poor wear tolerance.
As a rule of thumb, it is best to apply fertilizers when your lawn is actively growing. If you fertilize with nitrogen while your lawn is dormant, you can encourage weed growth, and ultimately waste fertilizer.Cool-Season Grasses tend to have two flourishing (or growing) periods. The first is after the lawn's return from winter dormancy. Avoid applying nitrogen when your lawn is dormant or has not yet greened-up. 2  The growing stimulant provided by the nitrogen could end up encouraging weed growth or the growth of other unwanted grasses in your lawn.