bad heater core or clogged - Ford Powerstroke Diesel Forum
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Old 12-30-2012, 01:37 PM
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bad heater core or clogged

No heater in cab but all numbers on edge insight sre good. I have noticed coolant puking out of degas bottle. If I reverse flush heater core, can I do flush without flushing whole coolant system.
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Old 12-30-2012, 01:40 PM
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I think you may have a head gasket issue

a heater core issue won't cause puking
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Old 12-30-2012, 02:25 PM
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Yup, agreed. OEM thermostats fail open so that pretty much leaves HG's


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Last edited by Term3; 12-30-2012 at 03:00 PM.
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Old 12-30-2012, 03:23 PM
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ECT and EOT deltas are only 5 to 10 degrees

Main problem is no heat in cab. Belows cold out of vents with temp and fan on high
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Old 12-31-2012, 03:40 PM
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does your truck have the electronic climate control? Look over at the passenger side by the valve cover, there is a hose going to the heater core and it has a valve on it that is run by vacum, check to see if the vacum line is hooked to the valve and check to see if the valve is working, if your truck even has this valve or not?
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Old 12-31-2012, 03:57 PM
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Thanks Smokejoke
Truck has climate control
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Old 12-31-2012, 05:00 PM
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Is your heater core getting hot? If it and you have auto climate control there is an electric actuator operated blend door. It modulates back and forth opening heater core and evaporator core to duct system to balance out cab temp. Check fueses to see if any are blown connector for it is on passenger side near center of dash on duct work. There are two electrical connections on duct work blower motor and blending actuator. Hopefully the Tab on blending door is not broken off and door stuck major PITA to fix. Hope this helps.
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Old 12-31-2012, 11:48 PM
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For what it's worth I switched coolant from Ford Gold to a CAT EC-1 coolant and I pulled thermostat and put in 2/3 cup of Cascade dishwashing soap and went for a 30 mile drive. I flushed out the cooling system with a 55 gallon drum of distilled water and along with the help from a 3/4 hp pump to push it in the cooling system, once I was done and the new coolant was in my heater got hot as hell. So as long as you don't have any head gasket issue a good coolant flush with Cascade may help you out.
Also where is the fluid level at the coolant tank, lower line is where it should be. Like the guys mentioned look at hheater actuator and make sure vacuum hose is connected and that it does move through the range. Hope this helps......
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Old 01-01-2013, 08:22 AM
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Do you have a warm truck yet? What did you find?
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Old 01-01-2013, 08:51 AM
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bad headgaskets will put pockets of air into the cooling system. it's those pockets that cause excess cooling system pressure. no heat is not a common concern BUT does occur with failed headgaskets
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