Transmission & Oil Coolers

The two types of coolers perform the same function for different components of the car. The main purpose of both is to cool hot fluid so it can perform as specified and lubricate, protect and cool components in the transmission and engine.

An oil cooler is designed to disperse heat from the hot fluid flowing through it. The incoming air, which is at a lower temperature than the fluid in the cooler, helps the fluid cool down before going back into the transmission or engine. The airflow is one of the biggest factors in allowing your transmission or oil cooler to do its job, which is why most people use an easy installation site at the front of the vehicle near the radiator. If you aren't able to install the oil cooler in the front of your vehicle, it is recommended to use the cooler with a fan.

Automatic transmissions have largely taken over from manual gearboxes and are the dominant method of converting engine power to drive at the rear wheels. The oil or transmission fluid inside the unit is vital in keeping it operational, and if it gets too hot, it can cause problems. Any rotating mass causes friction which generates heat. If put under load when towing, this causes more heat. If too hot, the fluid can lose its qualities and begin to break down or even get burnt. This can lead to transmission damage or, in really bad cases, transmission failure.

Engine oil is very similar to transmission fluid. Keeping the engine going is vital, as heat and load can cause similar issues. It has the added problem that the combustion process generates a lot of the heat, which is why all petrol and diesel engines run some type of additional cooling system.

Most vehicles with an automatic transmission have some form of transmission cooler. If you regularly tow or carry heavy loads or spend time driving in mountainous terrain may determine the need to increase the size of the stock cooler. This will ensure the reliability and durability of the transmission. Both larger and smaller engines will benefit from transmission coolers.

High-performance vehicles can really use engine oil and automatic transmission fluid coolers. They are normally driven harder (on the track or drag strip), generating more heat, so having the coolers keeps the fluid protected from temperature increases.

If you notice any of the below signs, this is an indication that your oil cooler may need replacing. Not sure if you need a replacement, get in contact with your local Repco Authorised Service centre or alternatively contact your local Repco store, and they may be able to suggest a local mechanic.

• Visual inspection - check for damage to the hose.
• Check engine light appears on the dash.
• Check cooler mounts for wear and tear.
• Check for leaking oil from hoses, fittings or the cooler.