i need heat for my baby please help - Ford Powerstroke Diesel Forum
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Old 11-22-2010, 08:03 PM
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Red face i need heat for my baby please help

Hi guys i posted an add on here yesturday regarding my 03 f350 6 liter would not pump good heat. I was told to change the thermostat and heater core.So my husband did. My engine temp is around 192 but when im on vents and turn my 4x4 on it goes to defrost and blows cold for about 4 minutes then starts to pump the heat again. my automatic hubs dont work when the heat is on vents. My truck blows heat but like i said when i put it into 4x4 and my heat is coming out of my vents is changes to defrost but when i put it back into 2 wheel drive the heat comes out of the vents again. My husband thinks it a vacum leak but he doesnt now where to look. Would anyone have a diagram on the vacum line or what else could it be. please help we are - 40 here today and my baby needs heat so she doesnt get sick. Thanks so much guys
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Old 11-22-2010, 08:33 PM
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u may want to put this in 6.0 problems.....interesting though, mine is doing some similar weird stuff. subscribed............
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Old 11-22-2010, 08:35 PM
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On the passenger side, on top of the engine is a hose that goes from the near the alternator to the heater core. There is a valve inline that controls how much coolant flows to the heater core. It is vacuum operated and should have a gray line that plugs right in the front of it. It could have come off or the valve could be bad. The valve is near the oil fill tube.
Hope this helps you out...
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Old 11-22-2010, 08:47 PM
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that grey hose is on is there. is there a way to bypass this valve
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Old 11-22-2010, 08:51 PM
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You could remove it and place a section of 5/8 pipe in there to see if it will work.
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Old 11-23-2010, 08:36 AM
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so this valve you are talking about has a grey hose going to it right?? where does he put the peice of 5/8 pipe in. will this by pass the vavle all together or will we run into problems down the road. would this valve also stop the automatic hubs from working. I could be sitting still and have my heat on vents and when i turn my nob to put it into 4x4 it goes to defrost. But when i put it back into 2 wheel drive it goes back to vent. My hubs are manual locked and still does the same thing with the heater.
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Old 11-23-2010, 09:42 AM
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You have a vac leak at the hub. On the pass side, you will see a vac line that goes to the hub make sure they are on both hubs and no cracks. You can follow that line up into the engine comp., disconnect it and plug the end that goes to the truck. Now you wont have esof but hay regain heat
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Old 11-23-2010, 09:46 AM
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I've heard of this problem before, it's def something to do with the vaccum lines for the hubs and whatnot. I'll see if i can dig up an answer for you.
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Old 11-23-2010, 09:53 AM
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Hopefully this will help you figure out your problems. Take a look here:

Heater quits in 4x4
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