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.
Keep in mind that some warm-season grasses, including some cultivars of bermudagrass and St. Augustine grass, don't do well when planted from seed. The soil temperature range for most warm-season grasses is between 65 and 75 degrees Fahrenheit and sometimes higher.Optimal air temperatures for warm-season grasses are 80 to 95 degrees Fahrenheit.f you plan to start your new lawn from seed, it is critical to know the best temperatures for seed germination.