Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2025MUSTANG ECOBOOST PREMIUM, 2D CONVERTIBLEREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONENGINEGENERAL COOLING SYSTEM SERVICE - GENERAL INFORMATIONTESTINGPRESSURE TESTINGCOOLING SYSTEM
2025 Ford Mustang EcoBoost Premium, 2D Convertible
Cooling System
2025 Ford Mustang EcoBoost Premium, 2D ConvertibleSECTION Cooling System
- Turn ignition off and allow engine to cool. Ensure radiator if filled to correct level. Remove cap and attach pressure tester to radiator. Pressurize tester to full radiator rating specification.
- If pressure drops, check for external leaks. If no leaks are found, start engine and allow to idle. If pressure builds up immediately, check cylinder head and block for cracks. If pressure does not build up immediately, go to next step.CAUTION: DO NOT allow excess pressure to build in cooling system or damage may result.
- Using pressure tester, pump cooling system up to pressure specified on radiator cap. If pump gauge pointer vibrates, compression or combustion leak into cooling system is indicated. Isolate leak by shorting each spark plug wire to cylinder block. Gauge pointer vibration will stop or decrease when leaking cylinder is shorted.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.