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.
Best results are achieved when applied on a sunny day when the temperature is between 45 degrees and 85 degrees F. Long weeds should be trimmed down before application. Weeds will yellow and wilt within 10 hours. They will be dead in one to two weeks and should not grow back for one year.ost weeds will show signs of wilting or yellowing of new growth within 24 hours of application. Necrosis will spread, turning weeds brown and killing them within 14 to 28 days. If seeds were fully developed before the weeds die, they will still be viable, however.