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From the top you can see the bypass valve in the open position. Obviously this is a “cold” condition and the bypass valve is open. When it gets hot it extends farther outward (toward the other hole).
This illustration makes it easier to see how the thermostat works. Oil enters the thermostat from the white hole on the left in each of the two pictures. If the oil is cold (< 180 degrees F) the bypass valve inside the thermostat is open and most of the oil passes right back out of the thermostat through the white hole on the right in each of the two pictures. When the oil is hot ( >180 degrees F) the bypass valve closes and oil is forced to take the long way ’round through the oil cooler before looping back and exiting through the output side of the thermostat again.Installation
Before we cut any of our expensive hose we mounted our oil cooler and the thermostat so we could do that whole measure twice, cut once thing.As we mentioned before the oil cooler should fit well in either of the stock locations behind the bumper on each side of the car. However, since the oil thermostat installs on the left-hand side of the engine we’ll mount the oil cooler on that side as well to conserve hose.
We test fit the cooler using some locking C-clamps…
