6.4 NO HEAT - Ford Powerstroke Diesel Forum
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Old 11-20-2013, 01:12 PM
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6.4 NO HEAT

I have an 08 f250 with a 6.4
No .heat. After having driven it for almost an hour...
Temp gauge is up, normal operating temp.
Reservoir bottle full prior to cold start, and not losing coolant.

One of the heater hoses is hot, the other cold...
BUT also the upper rad hose is hot and the lower rad hose seems cool too.

Not sure what I have going on here. clogged rad? clogged heater core? bad thermostat? Temp rose normally and stayed pretty evenly. no fluctuation witnessed and has not ran hot.

Is there something im missing or a common problem with these?
Truck has about 180,000 on it.

Any help would be greatly appreciated!
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Old 11-20-2013, 04:12 PM
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someone might have bypassed the heater core for the passenger compartment. That or installed a bypass valve.
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Old 11-20-2013, 05:09 PM
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Disconnect the heater core and flush it with chems... Sounds clogged.. it doesn't exchange enough heat for the return line to be cold.
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Old 11-21-2013, 12:11 PM
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Heater core was plugged solid! Just didn't want to believe it for some reason. I got some heat out of it now. Prob get the season out of it... I'm hoping
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