Question about 2004 Ford F250

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I have 2004 ford f 250 6.0. let me start by saying, it has new head gaskets, new head bolts, new glow plugs, new water pump, egr delete, even new radiator cap, only 6000 miles ago. but now when engine is cold and some times normal temp, the coolant reservoir bubbles, it builds pressure in reservoir. the heater does not work for awhile. no smoke, runs well. but to much pressure in reservoir to the point it bleeds off like a kettle. i have to leave cap a little lose and coolant bubbles a lot, not boil, bubbles. does not over heat. with the obvious things coverd, what causes this.

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I my experience it is a compression leak into the cooling system probably a crack between the valves or improper torquing of the heads one test to confirm is test the cooling system for hydrocarbon emissions you can do this with a gas analyzer or a block fluid test kit if you uses the fluid test follow the directions exactly or you could get a false reading

Posted on Dec 07, 2012

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Posted on Jan 02, 2017

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Thunder55
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SOURCE: engine overheats when heater pipes connected

I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Posted on Jan 29, 2009

  • 2187 Answers

SOURCE: i had ford f150 with

If this is left unattended this may cause problems in the future. With the parts you have replaced, this may be an issue with blockage in the system, air in the system or even a bad radiator cap or head gasket (worst case). If you have changed the water pump and radiator I would assume that the cooling fluids were changed, you may have this drained in this process just to make sure. After a cold start you may open up the radiator cap and squeeze the top hose to get the air out of the system. Add water/coolant when necessary. Inspect the radiator cap if it is worn out. You may need it replaced as pressure may come out of the system.
If all the items does not show any issues then it may be the head gasket. Although this is the worst case scenario it is best to check. Observe first the car. Check for the quality of the oil and water you may get water into the oil or oil into the water. Check also for white smoke.

Posted on Jun 25, 2011

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tecnovative_96.gif
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