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.onversely, even if you don't want a good looking lawn, you should at least fertilize twice a year for your grass's sake. As discussed in the section on grasses, there are two types of grasses: Warm-Season & Cool-Season.