Heater blowing cold at low RPM's? - Ford Powerstroke Diesel Forum
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Old 01-22-2011, 09:54 PM
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Heater blowing cold at low RPM's?

My heater is blowing cold air at low rpms, if im in park it will blow cold until i start driving, any ideas?
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Old 01-22-2011, 09:58 PM
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Do you want the good news or bad?

Mine just did the same exact thing. Turned out the degas was bone dry and when I filled it back up the heater worked great. Problem is the next day the bottle was empty again. My EGR had failed completely and filled #7 with H20 and was leaking out onto the ground. Sorry man.
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Old 01-22-2011, 10:02 PM
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ouch....solution was?
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Old 01-22-2011, 10:09 PM
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do i even want to know?
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Old 01-22-2011, 10:10 PM
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I just got done yesterday. I replaced the EGR cooler with one from Bullet proof, put in a factory oil cooler, replaced the oil rail plugs while it was apart and did the coolant flush the PGreenSVT recommended.

Total cost with having a Ford mechanic do it as a side job was $1500. He gave me the VC-9, but I did the flush and with the Restore, the coolant and the distilled it was another $150 there abouts.
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Old 01-22-2011, 10:15 PM
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Is your truck blowing white smoke (steam) out of the exhaust?

Best thing to do is fill the degas back up (I'm assuming it's way low) and let it sit over night. DON"T JUMP IN AND START IT!. Look on the ground in the morning and see if there is water on the ground where the evap drips on the ground. If there is, check your degas. If it's empty or low again, your EGR cooler is most likely shot, which means the oil cooler is probably plugged up too.
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Old 01-22-2011, 10:22 PM
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It's winter in Connecticut and its been cold so i assumed it was related. I always let the truck warm up for at least 10-15 before i drive it but i have only plugged it in several times. havent noticed anything leaking but the degas bottle does seem to be down a bit. i havent noticed steam because of the exhaust in every car here is visable in 10 degree weather. i cleaned the egr valve itself about 3 months ago because it threw the code, new o rings and gasket with a can and a half of throttle body cleaner made it function well again. i did notice some sticky stuff in the tube though!
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Old 01-22-2011, 10:32 PM
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Well if your degas isn't empty, I don't know. Park it nose down and pull the egr. If there's coolant in there then it's the EGR cooler. Other than that I'm at a loss.
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Old 01-22-2011, 10:32 PM
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what should i fill it with? ford spec?
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Old 01-22-2011, 10:44 PM
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Until I found out where the coolant is going I would fill it with 50/50. Then if you find your egr cooler is bad do the flush pgreensvt wrote up after you change the cooler. If its not the cooler and you have a loose hose or something then do the flush. I just wouldnt go to the effort of the flush and then find out you have to drain the system to change the cooler
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