Question about 2003 Ford F250 Super Duty Crew Cab

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Diesel in coolant resevoir

There is diesel in the coolant resevoir of my 2003 f250 7.3L diesel. How could they have got mixed? There has been no loss of power, and nothing is in the engine oil.

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Cracked injector tubes or tube.

Posted on Jun 03, 2009

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You could have a blown head gasket, have a compression check done to see if there is any low cylinders,

a head gasket failure does not always allow water to get into the oil, the failure point can also be between the water jacket and the cylinder bore

Posted on Oct 06, 2008

  • Albert Bailey Jan 31, 2012

    I know this might sound crazy. But if you have a automatic transmission it could be transmision fluid it well look the same. the fluid is cooled through bottom of the radiator.& well migrart to your water if theres & enternal leak

  • Albert Bailey Jan 31, 2012

    I know this might sound crazy. But if you have a automatic transmission it could be transmision fluid it well look the same. the fluid is cooled through bottom of the radiator.& well migrart to your water if theres & enternal leak

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I have a 2003 Ford F350 7.3 diesel engine,Engine run fine,but only the problem diesel mix with coolant,what could be the problem.


you may have two hoses that hooked into your radiator that help cool you oil. If the radiator breaks down inside than you need to replace the radiator. The radiator probably has four tubes or hoses bolted to the tanks. Two four transmission two for cooling oil. If so you need to replace the radiator and flush out the cooling system and clean out the water jug. Do not wait long cause you could clogg your heater core with oil. and also cause the vehicle to over heat and that is not good for diesels.leave comment

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