2004 Ford F350

2004 FORD F-350
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HARLEY41
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Heater problem
2004 Ford F350 Four Wheel Drive Automatic 91000 miles

2004 F350 diesel Heater won't blow hot air continuously. At normal operating temp I turn off the heater fan for a few minutes then turn it back on and I will get hot air for a couple minutes then it turns cold again. Is it just a thermostat issue?
Feb 5, 2009 at 4:26 PM
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HELPING YOU
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Doesn't look like a common prob, (no replies).
T-stat prob. would show low on your temp guage... feel around under hood when blows cool - is engine hot? , are heater hoses hot? (in AND out of core?) if they are the prob is likely a"blend door" or something letting cold air in WITH the recirculating. A PENCIL falls down the defrost and can do strange things to doors....
How about a valve on engine side or a hose kinked - check on top of right (passenger) valve cover - is there a valve there and the vacuum line controlling it fell off?
When you're feeling around you should be able to tell where the heat is and where it's not -your problem is at this transition. If the heater core's plugged it will do this symptom but I've not seen that in a while.
Feb 13, 2009 at 10:22 PM