97 7.3 Cooling System Issue - Ford Powerstroke Diesel Forum
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Old 04-25-2013, 03:33 PM
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Exclamation 97 7.3 Cooling System Issue

I have a 97 F-250 7.3L. I have been having an issue with it getting air in the cooling system for about 3 weeks now, the heater stops working and it blows out of reservoir. It happens when the truck is cold I will get in and drive for about 5 miles till it gets warmed up then when I stop at the stop sign 5 miles from my house the heater will go cold and then the reservoir will overflow. I have tried to see if the truck will push the air through on it own, it won't. I have a flush kit fitting installed in my heater core line, so when the heater goes cold I get out and pop the hood and burp the air out of the system using the flush kit fitting then everything works fine for as long as i drive the truck. Once i let the truck cool down then the air problem will come back and i have to burp the air out again after 5 miles or so of driving. I have changed the fan clutch and water pump because the bearings were bad. Thermostat, reservoir cap, and Heater core. I don't have oil or fuel in my reservoir and no coolant in my oil. I'm going to napa tomorrow to buy a combustion leakage tester so i can check my head gaskets and heads. But if that checks good then I'm out of idea's unless the radiators bad? I have no visual leaks that i can see and system seems to hold pressure i have not put a gauge on it, but the hoses stay firm after truck is off.
Any help would be greatly appreciated.

Thank you
Mitch
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