Overheating probem
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Overheating probem
I have a 2000 f-350 that overheated 2 months ago I replaced the radiator...it seemed fine for a month then started blowing cold air then would start to overheat and back and forth so I replaced the thermosat.......but when i checked the old one with a cooking theromometer it was fine. not long after that the heater core started leaking so i replaced that..and now its back and forth overheating and blowing cold air....then fine for 1/2 hour..then back and forth again..any ideas truck has 250,000 miles on it 
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yea it does but only after ideling for about 20 mins with the resivor cap off the water will be cold and clear if we have been adding then it will raise up and over flow and you can see it change from clear to antifreeze and it also goes from cold to the touch to warm at the same time like a thermostat
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I've always thought the oil would be milky if coolant was mixing with it but ill keep it in mind thanks for responding
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First response on your issue from most will be Headgasket.
Drain oil, drain coolant.
What's there?. If not mixed and clear then it's probably not a head gasket. You can reuse if in good condition.
Check and recheck T-stat and all parts collant runs through. Might be a hose line blockage...( water pump fragment, heater core blockage or fragment which can get in the sytem and cause a blockage). Check all passage ways and hoses. Does the lower R-hose colaps under pressure..(engine running or running hot)? It there air in the system?
respond with answers to remove what is not your issue.
Drain oil, drain coolant.
What's there?. If not mixed and clear then it's probably not a head gasket. You can reuse if in good condition.
Check and recheck T-stat and all parts collant runs through. Might be a hose line blockage...( water pump fragment, heater core blockage or fragment which can get in the sytem and cause a blockage). Check all passage ways and hoses. Does the lower R-hose colaps under pressure..(engine running or running hot)? It there air in the system?
respond with answers to remove what is not your issue.
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That sounds like a head gasket to me. I had the same experience with the wife's Taurus a few years ago when it overheated after the coolant reservoir sprung a leak. It was pushing compression into the cooling system which caused it to push coolant out the coolant reservoir. A blown head gasket will either pull coolant into a cylinder, allow coolant to get in the oil, or allow compression from a cylinder to get into the cooling system. I got lucky and was able to fix it with K&W block sealer. That stuff really works but you must follow the instructions very closely...
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Where is this " degas bottle Cap"?
Post Fiend
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From: Mt. Shasta California
I think it is the cap also. Head gaskets are rare and they come with a set of telltale signs. You can check your cap at O'Reillys for free. At the same time get a MOTORCRAFT thermo because they have to be just right nowadays with that pre-recirculating system the modular motors have. Do those 2 things and your problems should be over...............keep us posted.
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