pressure in degas bottle - Ford Powerstroke Diesel Forum
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Old 01-24-2011, 03:55 PM
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pressure in degas bottle

late 99 f250 7.3 im gettin exsesive pressure in degas bottle. truck idles fine when cold. it seams after thremostat opens (i think) all hoses get hard as rocks then pressure slowly increases. new radiator, themostst, heater core. flushed and filled with elc fleet guard. help im stuck. has new head gaskets 2000 miles ago. injector cups? but no diesel in coolant. blown head gasket? but no smoke or over heating. HELP. also no loss of power drives fine.
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Old 01-24-2011, 05:28 PM
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It kind of sounds like you have a air bubble in the system, or your thermostat is sticking.
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Old 01-24-2011, 05:47 PM
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how do u get air out
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Old 01-24-2011, 06:13 PM
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There is a couple of ways. Some guys say to jack the front end up making the degas bottle the highest point in the cooling system and leaving the cap off and letting it set making gravity do its work.
One guy showed me to run the engine for awhile getting it close to opt temp shut it off, squeezing the upper radiator hose listening and feeling for air bubbles to flow through the hose back to the bottle then slowly loosening the cap letting the pressure release, and repeating all of it till you have your truck at opt temp and and your upper hose is not pressurized and you have coolant flowing through and your thermostat open.
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Old 01-24-2011, 07:27 PM
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I would drain the radiator completely. Then pull the heater hose off the water pump refill the radiator slowly with the heater hose off. And when coolant starts coming out of the heater hose put it back on finish filling the degas bottle. Should be no air in the system. I just did a water pump on mine this it how I got all the air out.
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Old 01-25-2011, 01:22 PM
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update.....
installed a flush tee in heater hose at highest point. then ran about a 2' hose down into degas bottle down below antifrezze level. started truck and let run. bubbles came out of hose and with end of hose in antifreeze it can only suck fluid and not air. ran for about 20 min and bubbles didnt slow down or stop. if i pinch off hose. you can watch level go up in bottle let go of hose and level drops. help................ gut is telling me possible head gasket or injector cup. but as stated before no smoke or oil in antifreeze. also wife is pissed i just installed 2 new gaskets this summer. motor i installed had a broken piston on one side and a mose nest in the intake on other side. :-(
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