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Over heating 2001 Ford F-250

My ford F-250 has been purging out antifreeze, i had changed the thermostat, fan clutch,water pump,and the cap on the fill tank. It was still having the problem after all that, so i got some advice hear that there might be some air in the system causing this and the heart to blow cold, so i took the cap off, started it and let it cycle for a long time and got what i think was air out of the system. when i took it for a test drive it worked great, and even later that night it worked great. However when i got into it the the next morning to go to work the trucks heat was blowing cold and when i checked under the hood i noticed that there was a small amount of water leaking out from the cap again. I don't think it is a much as before but what is going on should i purge it again, could there still be more air. If so why did it work so good the first day after i purged it?

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If there was air truck wud be overheatn-no liquid wud b movin once the air hits the pump--it blows cold cause the heatr core probly bad or the channel doors not workin rite---leak is from bad radiator or engine gaskets--a leak test must be performed to verify----a

Posted on Feb 13, 2014


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SOURCE: I have a 2010 ford

The performance of the heater indicates low coolant level. Pretty strange about the multiple water pumps, but if is is under warranty, you need to keep going back to the dealer. They must be missing something...

Posted on Dec 16, 2010

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Check for cracks in the system. It sounds like you have too much air in it. If you are driving, does the temperature gage fluctuate? The cap is designed not to leak, but hot compressed air will blow by it. When it does, it easily confused as coolant "purging" out of the system, but really it is steam and air. By removing the thermostat, you are fully opening the coolant cycle and the water is free to circulate. Also, with the thermostat removed, the system can't build up enough pressure because it is open to the collector bottle, which in turn is open to the atmosphere. The system is designed to work under pressure so you should keep the thermostat in. That said, try to purge the system. Remove the thermostat, plug the overflow tubes, and pull a low vacuum on the reservoir (collector bottle). You want to make sure the reservoir is about half full. My personal experience is using about 5 to 6 inches of vacuum pressure for about 30 minutes. If there's lots of air, you will see bubbles in the reservoir. And as long as you have enough coolant in it, when you remove the vacuum, it will not draw air into the system, so make sure there's enough coolant in the reservoir. I am not sure about this truck, but some vehicles actually have a purge valve on the main coolant line close to the thermostat, and usually at the highest point in the system. It looks like a Schrader valve. So, if you have this, let the car cool down, put some rags around the purge valve, remove the valve cap and purge away (like letting air out of a tire). You'll have to do this a few time after driving to completely vent the system. Finally, if you do overheat again and start spewing coolant, before the car has a chance to cool down, fill the reservoir with coolant at least up to the hot level mark. That way, when the engine (and coolant) cools down, it will draw the fluid into the radiator. Otherwise, you just end up pulling more air into the system making the problem worse. Hope this helps.

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