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.
If so, you want to get the pre-emergent down specifically before the crabgrass germinates. In your area, that should be awhile, (written in February) but the only way to tell is by soil temperature. When soil temps get up to about 55 degrees for 1-2 days, the crabgrass will start to germinate.he temps in the evenings is right at 60. ANSWER: A Pre Emergent weed killer can be an important weapon in your arsenal to fight weeds, especially the persistent problem of crabgrass. However, your question points out how important it is to get the right tool for the right job.