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Cooling

How do I know if my 6.0 Power Stroke EGR cooler is failing?

Applies to: Power Stroke · Pickups, Vans & cars

Power StrokePickupsVans & carsCooling

Short answer

The 2003-2007 6.0L Power Stroke is known for EGR cooler failures. Specialist sources tie many of them to a clogged engine oil cooler that starves the EGR cooler of coolant flow, so the cooler overheats and ruptures. Coolant loss and white smoke are the classic signs.

Safety first. Diesel injection systems run at extremely high pressure; a pinhole leak can inject fuel through skin. Exhaust and turbo parts stay very hot long after shutdown. Never open a hot cooling system. If you are unsure, stop and see a qualified diesel technician.
Engine bay of a Ford Super Duty with the 6.4L Power Stroke V8 Turbo Diesel cover
A Power Stroke V8 Turbo Diesel engine cover (this truck has the later 6.4L). Photo: cdolivei, CC BY 2.0 (resized), via Wikimedia Commons.

Start with the easy checks

  1. Track coolant level over time (cold engine only).
  2. Watch for white smoke with a sweet smell, especially on startup.
  3. Have a scan tool show engine oil and coolant temperatures if you can; specialists compare them to judge oil cooler health.

Likely causes, most common first

Clogged oil cooler
Restricts coolant flow to the EGR cooler.
Ruptured EGR cooler
Coolant enters the exhaust and intake path.
Head gasket
Also a 6.0 concern; testing separates it from the cooler.

These are common causes, not a diagnosis. The same symptom can have a different cause on your engine; codes, tests and your service information decide.

When to stop and see a diesel tech

  • Coolant loss with white smoke.
  • Steam or coolant out of the exhaust.
  • Before replacing parts: get it tested. Replacing an EGR cooler without fixing a clogged oil cooler can repeat the failure, per specialist sources.

Questions

Why do 6.0 Power Stroke EGR coolers fail?

Specialist sources commonly link them to a clogged oil cooler that reduces coolant flow to the EGR cooler.

Cooling

My diesel is losing coolant with no visible leak. Why?

DuramaxPower StrokeAll dieselsPickupsSemi trucksRV / diesel pushers+ moreTroubleshoot →Smoke

What does white smoke from my diesel mean?

All dieselsPickupsSemi trucksRV / diesel pushers+ moreTroubleshoot →Cooling

Why does my diesel run hot when towing?

All dieselsPickupsRV / diesel pushersTroubleshoot →

Where this comes from

Last reviewed 2026-10-19. General information only: confirm with your service information and a qualified diesel technician.