Heater blowing cold air - Ford Powerstroke Diesel Forum
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Old 12-18-2012, 07:26 AM
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Heater blowing cold air

i've done some research on here regarding this issue already and i'm not sure what to try next.

what it's doing is simply blowing cold air. the temperature doesn't change at all no matter where i turn the temp control knob. it's done this before where it works one minute and the next it doesn't. my boy and i were driving around on sunday and i noticed it was getting cold in the truck so i started cranking up the heat.....or at least i thought i was. nope, no heat!

after looking on here, i checked my coolant level. it was low, so i added more coolant/water and kept my fingers crossed hoping this was my issue. nope! still no heat.

what can i look at next to try and track this problem down?
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Old 12-18-2012, 08:53 AM
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What is your coolant temperature? It could be a stuck open thermostat.
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Old 12-18-2012, 08:56 AM
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it tends to run about 190-199. i did notice on my way to work this morning that it went to 201. it's probably 85% highway miles.
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Old 12-18-2012, 08:58 AM
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It might be worth changing the thermostats to see if that helps
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Old 12-18-2012, 09:05 AM
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do you know what the normal operating temps should be?

i read something about a "blend door" where some folks are getting hot air on one side and cold on the other. I just checked that as well, and i'm not having that problem either. i don't have the climate control buttons, i have the temp dials so i don't know if that could even be possible.

i re-checked my coolant level (since it was dark when i filled it) and it's still down about an inch below the "max" line. would that be enough to keep the heater from working?
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Old 12-18-2012, 09:08 AM
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your temps are normal. My truck runs around 194* depending on the ambient temps. I think the blend doors are only on the dual climate control but i am not for sure. I would guess if the coolant is low it could affect the heater but if its an inch low i dont think it would be that. On the new degas tanks they lowered the fill line about an inch anyway.
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Old 12-18-2012, 09:14 AM
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got it. it sounds like my hope for a simple fix is quickly disappearing

i have a call in to one of the local ford dealers to see if they will cough up any ideas. i was going to try and find the heater core and see if the coolant lines coming and going were hot but i can't even find the damn thing! any ideas there?
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Old 12-18-2012, 09:18 AM
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The heater core is on the firewall on the passenger side. It should be behind the oil dipstick in that area
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Old 12-18-2012, 09:22 AM
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i'll take another look, but i can't even hardly see anything in there! even if i find it, i'm not sure i can get my hand in there....lol.

do i need to remove the air intake to get to it?
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Old 12-18-2012, 09:24 AM
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There was a video on youtube and the guy just took off the glove box and got to it from there from inside the truck. It was for the 99-07 superduty's. Not sure if its the same for ours tho.
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