Transmission Oil Cooler

How it works Most engines operate best at temperatures between 180° and 200° F. (81° and 93° C.) When the coolant in the cylinder block reaches the thermostat temperature, the thermostat begins to open. This allows heated coolant to circulate through the engine block, radiator and the rest of the cooling system. The thermostat will open when the temperature rating of the thermostat is reached. In most systems, a thermostat of 180° is used.

Related Problems 1. If the thermostat does not open properly and the coolant in the engine block is not allowed to flow to the radiator, damage to the engine block. the engine will overheat. This could cause serious

2. If the coolant is circulated before the engine warms up, the engine will run cold. If the engine runs cold, water in the coolant can condense and form acid compounds. These acids can dilute the oil, corrode engine parts, and reduce the life of the engine. A cold engine will use more fuel and emit more hydi·ocarbons and carbon monoxide. A similar problem could occur in the transmission if not corrected. 3. If the thermostat is removed from the system and not replaced, four problems could develop: The engine will run cold when first started (because there is no thermostat to keep the coolant in the engine block until it reaches the minimum operating temperatw·e. The engine will take longer to warm up (or may never warm up in cold climates). The engine will

run hot after it warms up (because the coolant will flow too

swiftly through the radiator to lose the heat it's acquired).

The transmission oil temperature could be sub-cooled (especially in cold weather), which could cause moisture to form. This moisture could reduce the transmission's life.

Radiator Core When the thermostat opens, heated coolant is allowed to flow from the engine into the radiator core. The radiator core transfers the heat from the coolant to air being blown through the radiator core by the radiator fan.

How it works The radiator core consists of a series of metal tubes through which the heated coolant is circulated. Fins are attached to the tubes to create extra surface areas that enable the coolant to transfer more heat to the air.

The coolant transfers its heat to the tubes and fins which in turn transfer the heat to the air. The cooled coolant is then sent back to the engine block.