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The Peterbilt Transmission Oil Cooler regulates transmission fluid temperature as oil circulates through the drivetrain. During operation, heated transmission oil passes through the cooler before returning to the transmission, releasing excess heat in the process. This circulation helps stabilize fluid behavior during extended driving or under load. The cooler operates passively as part of the oil circuit, without interrupting flow or requiring external control. In multi-platform drivetrain layouts, the Peterbilt 019772X supports transmission oil temperature moderation for Kenworth and Peterbilt models including 377, 378, 379, and 387.
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