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Went today to check out a buddys truck, 06 F350 164k egr and cooler delete. He finally did his thermostat yesterday, after not having warm heat for months. Today on the way to work, had great heat for about 10 miles, then it went cold. Pulled over to check coolant, cracked cap loose, let pressure out, now had heat again. Same thing on the way home. Had the white streaks down from the cap, lost a small amount of coolant, just at min line now. Anybody been down this road ? Hes owned this truck since 48k and no heads have never been off.
OE ford was put in. He's been running for months with hardly any heat, now has good heat for a while. Then heat goes cold, until he loosens the cap on degas bottle, lets pressure out. Now has heat again for a while.
I had this issue on mine, lost heat after a quickie flush and would work on and off. Thought it was just air in the system, but after a few drives it never improved. After backflushing the heater core, the heat has worked better than ever. I have a tool from OTC that really blew the junk out of it. Its called OTC blast vac. Air hooks to one end and water hose to other. Then you can pulse blasts of air in with the water to break stuff loose. After the 3rd air blast on mine, clear water started flowing, first 3 blasts were very brown.
You could also put together a similar tool using a ball valve and some brass fittings in your local hardware stores plumbing section.
I guess I should have titled this thread "was a bad thermostat hiding a head gasket issue" Truck has heat for a while, goes cold, loosen cap let pressure out now has heat again. Also has been leaking from the cap since the t stat replacement sunday. Hes going to try a new cap in the am.
And make sure the heater valve vacuum hose is connected, it's near the oil fill cap, grey hose plugs into the heater hose to actuate the valve to allow hot coolant to the heater core.
Regarding this:
"Had the white streaks down from the cap, lost a small amount of coolant, just at min line now. "
I interpret that statement to mean that the coolant level was at the max line to begin with. Then after leaking, it lowered to the min line.
The min line is where it should be filled to when cold. If you fill to the max line, you are over filling. If you fill to the max line, it could cause this type of issue.
Just trying to eliminate the cheap and easy stuff before jumping to the 'bad gasket' conclusion.
And make sure the heater valve vacuum hose is connected, it's near the oil fill cap, grey hose plugs into the heater hose to actuate the valve to allow hot coolant to the heater core.
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