Coyote Coolant Flow & Fitting Guide

How The Coyote Cooling System Works

The Coyote uses a cross-flow style cooling system designed to control temperature at the heads and exhaust valve area. Knowing the flow path is key when you move this engine into a swapped chassis.

• Coolant leaves the radiator at the lower outlet and is pulled into the water pump.
• From the pump, coolant is pushed into the block and up through the cylinders into the heads.
• Coolant moves through the cylinder heads toward the front of the engine.
• It exits at the front coolant crossover / outlet and returns to the radiator upper inlet.
• Small ports feed the heater core and degas / expansion tank to purge air and stabilize pressure.

Your fitting choice and hose routing must respect this direction of flow to avoid air pockets, hot spots, and unstable temps.

Key Coyote Coolant Ports (Swap Reference, No Thermostat)

Below is a simplified reference for common swap layouts. Match each location with the correct BPS fitting.

1. Passenger & Driver Front Outlets (Upper Return to Radiator)

Main outlets from the heads back to the radiator. In a swap, this becomes your primary upper radiator hose connection.

• Use: BPS EN011
• Options: dual -12AN to 16AN Y-Block  (match your radiator inlet).
• Function: Sends hot coolant from the engine to the radiator.

2. Pump Inlet Side (Lower From Radiator)

Lower radiator outlet feeds the Coyote pump inlet. This must remain the main feed into the engine.

• Use: BPS EN014
• Route: Radiator lower outlet → BPS fitting →  pump inlet.

3. Heater Core Return

If your setup doesn’t use a heater core, route the heater core return port to the bottom of the expansion tank. This allows coolant to flow into the tank under normal system pressure.

The expansion tank now becomes the highest point in the system and serves as your main fill location. Fill the system directly through the tank’s cap and let it self-bleed while the engine runs.

This routing keeps coolant circulation consistent and makes the setup easy to fill, reliable, and clean-looking.

• Use: BPS EN013

Common Questions

Do I need a degas or expansion tank?

Yes. The Coyote cooling system is designed with a high point reference. A properly located tank helps purge air and keep the system stable.

Which AN sizes should I run?

Common setups use dual 12 AN to -16AN for the main upper outlet, -16AN for lower depending on radiator, and -8AN for heater lines.