Cat C15 Coolant Flow Diagram [new] Jun 2026

: Located at the front of the cylinder head, the regulator acts as a gatekeeper: Cold Engine : The regulator is closed, and coolant is sent through a bypass tube

If you cannot access a Caterpillar Service Manual (SENR), here is a simplified text diagram for the : Cat C15 Coolant Flow Diagram

Q: What is the recommended coolant mixture for the Cat C15 engine? A: The recommended coolant mixture for the Cat C15 engine is a 50/50 mix of water and antifreeze. : Located at the front of the cylinder

Before entering the engine block, the majority of the coolant is sent through the engine oil cooler . This critical step ensures that the engine oil—which reaches much higher temperatures than the coolant—is stabilized before it circulates through the bearings. Cat C15 Coolant Flow Diagram