Why does Subaru have 2 radiator caps?

Subaru’s Two Radiator Caps
Subaru vehicles are known for having two radiator caps in some models. The presence of two radiator caps is not unique to Subaru, as other manufacturers also use this design. The purpose of having two radiator caps is to improve the cooling efficiency of the vehicle.
Function of the Radiator Caps
The two radiator caps serve different functions. One cap is located on the radiator itself, while the other is on the expansion tank or overflow tank. The radiator cap is responsible for maintaining the pressure in the cooling system, while the expansion tank cap helps regulate the coolant level and acts as a reservoir for excess coolant.
Importance of Pressure Ratings
The pressure ratings of the radiator cap and the expansion tank cap are crucial. It is important to ensure that the pressure ratings are correct for both the coolant expansion tank and the radiator. Additionally, the radiator cap may have a vacuum valve, which helps regulate the pressure in the cooling system.
Impact on Flushing and Changing Coolant
Having two radiator caps does not significantly impact the process of flushing and changing the coolant. When performing these maintenance tasks, it is necessary to remove the appropriate cap to access the coolant. For example, on non-pressurized overflow tank systems, the radiator cap needs to be removed to check the coolant level.
Use of Subaru Coolant
Subaru recommends using their genuine coolant/antifreeze for warranty coverage of cooling system components. It is advised to use Subaru coolant/antifreeze in Subaru vehicles, as other brands may not meet the necessary specifications.
In conclusion, Subaru vehicles have two radiator caps to improve cooling efficiency. One cap is located on the radiator, while the other is on the expansion tank. The pressure ratings of these caps are important for maintaining the proper functioning of the cooling system. It is recommended to use Subaru coolant/antifreeze for optimal performance and warranty coverage.

How does Subaru coolant system work?

Your Subaru engine is kept at the correct operating temperature by liquid coolant pumped through internal galleries in the engine block and heads. Heat from the internal combustion process is transferred from the engine to the coolant.

How do you use a radiator with two valves?

In order for the radiator to heat up, both valves need to be open. Typically, the return valve will always be fully open, and you will adjust the flow valve appropriately to control the temperature of the room.

Do all radiator caps have 2 seals?

Different seal types in radiator caps
These systems require a cap with a double seal to maintain integrity. Double seal caps can also be used on non-recovery systems, whereas non-recovery systems typically have a single seal cap and cannot be used elsewhere.

Does Subaru use special coolant?

Every vehicle manufacturer, including Subaru has developed its own coolant or requires a distinct coolant that is unique to personal years and models.

Is there a difference in radiator caps?

Single seal radiator caps are used in the non-recovery cooling system and allow the coolant to be released and the air, whereas, a double seal radiator cap is used in the recovery cooling system allowing coolant to flow to and from the recovery or expansion tank.

What is the difference between Type D and Type F radiator cap?

The type F cap is to be used with aftermarket radiators only. This will not work on an OEM style radiator. The type D cap is to be used on OEM radiators only. This will not work on aftermarket style radiators.

What are the 2 valves on a radiator cap?

The radiator cap is a special cap consisting of a 2-way valve and a pressure relief valve. The cap controls increasing pressure as the coolant heats, and allows coolant to flow back into the radiator as the engine cools.

How do I know which is the inlet and outlet on radiator?

The easiest way to do this is to look at the direction of the valve. If the valve is pointing towards the radiator, then it is the inlet valve. This means that hot water is entering the radiator through this valve. On the other hand, if the valve is pointing away from the radiator, then it is the outlet valve.

Why is my Subaru using so much coolant?

The most common sources of coolant leaks in Subarus are the radiator, hoses, water pump, and head gasket. Replace the faulty component: Once you’ve identified the source of the leak, you’ll need to replace the faulty component. If it’s a hose that’s leaking, you’ll need to replace the hose.

What is the difference between recovery and non recovery radiator cap?

A non recovery system does not have a recovery or expansion tank; therefore a non recovery cap (single seal) only allows the release of coolant and return of air to the system. A non recovery cap cannot be used on a recovery system.