Choosing the Right Car Radiator Fan

The radiator fan is one of the most essential parts of your car’s cooling system. It helps cool your engine to prevent overheating and expensive repairs.

There are many different types of fans on the market, and choosing the right one is important for keeping your engine running smoothly. You should consider the fan’s diameter and CFM rating.

Variable Pitch

A variable pitch car radiator fan varies the blade angle to increase airflow at higher temperatures. This feature is useful for vehicles with a turbocharger or super charger, as it will help to move the air needed to cool the engine more efficiently.

These fans can be installed in cars with a wide range of engine sizes, including some small, compact engines that have limited space for a radiator. It is also ideal for large trucks and other vehicles with powerful engines that require more airflow to cool them.

The motorized, variable pitch fan has a reversible design and a clutch that disengages the fan when the temperature of the discharge air drops below a preset temperature. This is called a thermally activated coupling. The coupling has a bimetal valve that allows oil to enter when the discharge air reaches a certain temperature, then releases it when the discharge air cools again. This is similar to a bi-metal thermostat that controls the fan speed based on the rpm of the engine.

Variable pitch fans are not only effective in controlling the temperature of your engine, but they also help to keep your radiator clean and free of debris. Moreover, these fans can reduce maintenance costs and improve the overall efficiency of your vehicle.

This technology is available on a number of different fan types, and it can be easily retrofitted to any vehicle. Flotec can provide the appropriate fan for your needs and budget, so be sure to check with us before you buy.

Many of these fans are made with an integrated shroud, which is great for moving air through the radiator core more effectively. These fans will cost more than those without a shroud, but the extra benefit can be well worth it.

Some of these fans also have a vacuum-purge function, which cleans the radiator of any blocked contaminants. This can reduce maintenance costs by reducing the need for frequent high-pressure cleaning.

Another great benefit of these fans is that they can be used on machines that need to be kept clean and free of debris such as construction, municipal and forestry equipment. The constant exposure of these machines to dirt, dust and other airborne particles can easily clog radiators.

Straight Blades

The car radiator fan is an essential part of your vehicle’s engine cooling system. It works to regulate coolant temperature, prevent overheating, and reduce corrosion. However, choosing the right fan can be difficult with so many different types available on the market.

The main factors to consider are the number of blades, CFM rating, and current draw. More blades means more airflow for your engine and a higher CFM rating will help to protect it from overheating. Depending on your engine’s needs, you can also choose from curved or straight blades.

Some fans also have a shroud integrated into the design, which improves their airflow efficiency and reduces noise. These types of fans can be more expensive than those car radiator fan that do not have a shroud, but they are worth the extra cost when you need better airflow to cool your engine.

SPAL offers a variety of fans for almost any engine application and vehicle (street, strip, offroad, race, and more). Each fan comes with a CFM rating and amp draw to ensure that it will work well for your particular application and size.

If you have a high horsepower or modified engine, you may want to go for a fan with a higher CFM rating. This is especially important for turbo chargers and super chargers that produce more heat than stock engines.

A fan that has a high CFM rating will be more powerful than one with a lower rating and will move more air to help cool the engine. It will also be more efficient at moving air through the radiator core without loss of energy, which can lead to overheating.

Most radiator fans come with a shroud. These are usually installed on all fans, though you can also purchase a shroud separately for your fan.

The shroud is designed to direct the airflow to the radiator and keep it from escaping through the grille. It can increase the static pressure in front of the fan, which can help to minimize noise.

The shroud will also protect the fan from damage from rust, which can cause damage to the fan and the radiator. This will help to maintain the fan’s performance and ensure that it lasts as long as possible.


The car radiator is a vital component of your engine’s cooling system. It helps transfer the heat from hot coolant to cool air before it recirculates back into the engine. Without the radiator, it would be much too hot for your engine to run efficiently.

The fan is also a part of the car radiator’s cooling system. Its job is to pull air into the radiator and channel it over the radiator core.

To help the fan perform its job, the radiator fan needs a shroud to direct airflow. This car radiator fan allows the fan to be more efficient in pulling air into the radiator and removing heat.

This can be especially important for cars with a belt-driven fan. A properly fitted fan shroud ensures that every square inch of the radiator core surface is seeing airflow to remove heat.

It’s important to have enough clearance between the radiator and fan shroud. This is to accommodate the natural flex of the radiator and fan blades at higher engine rpm.

There should be a minimum of 1-inch of clearance between the fan and the shroud. This is to prevent overheating and fan contact issues.

The fan shroud is a passive part of your car radiator that has a huge effect on how well your radiator fan works. It directs airflow and helps protect the fan and radiator from damage and debris.

In addition, the shroud reduces fan noise and turbulence in the airflow. This can help you drive quieter and more comfortable.

Another benefit of the shroud is that it keeps road debris from hitting your fan and radiator. This can prevent serious injury from accidental contact with your vehicle.

When your fan shroud is damaged or missing, have it replaced as soon as possible to improve engine cooling and your air conditioning system’s performance. This will help optimize your engine’s ability to operate effectively and extend the life of your cooling system.

CFM Rating

A car radiator fan is designed to remove heat from the engine’s coolant fluid, which keeps the engine running safely. It also helps prevent overheating, which can lead to costly repairs and replacements.

A fan that does not work properly can damage the radiator or other parts of the engine. This is why it’s important to know how to choose the right fan for your vehicle.

One of the first things you should consider is the CFM rating. This is the amount of air that a fan can move in a minute. The higher the rating, the better its cooling performance. However, the CFM rating should be chosen according to your engine size and modifications.

For example, a 5.0-liter engine requires more airflow than a 4-cylinder. So, you may want to choose a fan with 2,800 CFM or more.

This is especially true when you have a turbo charger or supercharger installed on your vehicle. You’ll need a fan with a high CFM rating to help keep the airflow from overheating.

Some manufacturers even offer a CFM control module that can be mounted to the fan so that it will only run when the coolant is hot. This is ideal for those vehicles that see some track time and require a faster coolant temperature to maximize power.

If you’re not sure what CFM rating to look for, check with the manufacturer or a mechanic to get the best advice. Some brands, such as Spal, provide tabular airflow data for their fans to make it easier for customers to select the right fan.

In addition, you should pay attention to the number of blades on the fan. The more blades the fan has, the more air it can move and the more powerful it will be.

Another thing you should look for is a fan shroud. These are specially made to be more efficient at moving air through the radiator core and help increase engine performance.

Most fan shrouds incorporate rubber flaps that are closed while the car is parked and open at higher speeds to allow free flowing air to be pulled through. These types of shrouds are more expensive than those that do not have them, but they do offer greater benefits for your car’s cooling system.