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Old 02-26-2010
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Ongoing cooling system issues

Ok, so I made a thread in like December about my heat not working properly. Like an idiot I didn't check my coolant level before making it and found the coolant level was low after someone mentioned it in the thread. Topped off the coolant and it worked fine. Rarely use the heat and the truck has never overheated and I never saw any coolant on the driveway so I didn't think much of it. I was doing something to the truck shortly after and decided just to double check the level, and it was low again. Then I got under the truck and found it was the gasket for the timing chain cover that was leaking. Tore it all off and replaced the gasket and waterpump too since it was off and is a pain to do. Then I started having issues with my coolant leaking out of random places. It was leaking out of the lower rad house so I replaced that hoping maybe it was just old and crusty and moving it so much while replacing waterpump made it crack. Like 3 days later it started leaking out of the radiator cap, replaced the cap and it was fine. Then I noticed the new lower radiator hose is like about to blow apart. It is a 3 piece design with a T fitting and one of the hoses is moved down about 1/4". It has a lip and the only thing that stopped it from blowing off is the clamp is now at the point where the lip is. I figured maybe there was some kind of clog in the system so I did a flush using a flush kit and replaced the thermostat too. Ran the truck with straight water for a day and no more leaks at all. So I filled it with water/coolant and it was good for a week. I was on the highway doing like 80something and driving the truck pretty hard around town, pulled into the driveway and now there is coolant on my drivers side LCA and crossmember. I can't even tell where it is coming from but it looks like the radiator maybe. I have no idea why in the hell I'm having these problems and why apparently I have insane coolant pressure. I'm sick of throwing parts at the truck and sick of it not running right. I thought blown headgasket and tested it with a block tester and it showed I was good still.

Does anyone have any ideas? I just want to be able to drive my truck and not the stupid F150 that I can't park lol.
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Old 02-26-2010
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Is the level in the coolant reservoir fluctuating up and down as it should from hot to cold ?
If not , remove the small hose from the top of the rad by the cap and blow through it to check for a restriction.
Maybe also try another rad cap.
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Old 02-26-2010
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Yep, it is going up and down with engine temperature. It is lower than normal now because of it leaking.
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Old 02-26-2010
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Your radiator might be clogged with mineral deposits.
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Old 02-26-2010
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possibly. use an infrared thermometer and measure different parts of the radiator, they should all be the same. if not its clogged.
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Old 03-01-2010
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im havin kinda the same problem, bout once a week my heater would quit workin and i was low on coolant, i put a thermostat, a cap, a radiator, a fanclutch, and a waterpump. STILL NOT FIXED. pulled the heads and made an interesting discovery. i wasnt losing coolant to the cylinders but was losin compresion to the coolant system. it was buildin up so much pressure in the coolin system that it was bein pushued out of the cap and the overflow bottle
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