Advantages of a Direct Drive Fan:
* Always On Cooling: A direct drive fan constantly pulls air across the radiator, providing consistent cooling, which is beneficial if your engine consistently runs hot. This is the main advantage.
* Potentially More Cooling Capacity: A properly sized direct drive fan can move more air than a clutch fan, especially at low speeds where the clutch fan may not engage fully.
Disadvantages of a Direct Drive Fan:
* Increased Engine Load: A direct drive fan is always powered by the engine, putting a constant, albeit usually small, drag on the engine. This slightly reduces fuel economy and increases engine load, especially at idle.
* Noise: Direct drive fans are significantly louder than clutch fans.
* Potential for Overcooling: In cooler conditions, a direct drive fan might overcool the engine, potentially leading to slower warm-up times and other issues.
* Installation Challenges: Depending on the setup, fitting a direct drive fan might require modifications.
Why Your Impala is Running Hot:
Before jumping to a direct drive fan, you need to diagnose *why* your engine is running hot. The clutch fan could be the problem, but other possibilities include:
* Low Coolant Level: Check and refill as needed.
* Faulty Thermostat: A stuck-closed thermostat prevents coolant circulation.
* Radiator Issues: Clogged radiator fins, leaks, or a radiator that's too small for the engine's needs.
* Water Pump Issues: A failing water pump won't circulate coolant effectively.
* Head Gasket Problems: This is a serious issue where coolant is leaking into the cylinders.
* Cooling System Leaks: Check all hoses, clamps, and connections for leaks.
Recommendation:
Don't automatically assume a direct drive fan is the solution. First, thoroughly investigate the underlying cause of the overheating. Address any coolant leaks, check the thermostat and water pump, and make sure the radiator is clean and functioning properly. *Then*, if the problem persists and you've ruled out other causes, consider a direct drive fan as a potential solution. Even then, carefully select a fan with appropriate CFM (cubic feet per minute) for your 327's cooling needs, to avoid overcooling. A good mechanic should be able to assess your situation and offer the best solution.
