Cant figure this one out - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 10-05-2013, 05:51 PM Thread Starter Fanatic
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Cant figure this one out

When i bought my truck, the heat and ac didnt blow out of dash vents, only the defrost vents. I suspected it to be a vacuum leak so i checked the vacuum pump and there is what looks to be a missing hose. I havent replaced the hose yet but i then noticed that hot air is coming out of the defrost vents at all times even with the heat off. Also under heavy acceleration you can smell some antifreeze (not burnt antifreeze), which leads me to believe i have a bad heater core. I planned on running a pressure test but can anyone else give me some advice? Thanks.
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post #2 of 3 Old 10-05-2013, 07:26 PM
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dump the glovebox and locate a black plug with a white and black hoses. Make sure that connection is connected. FWIW, my buddys' truck did exactly what you posted, and found his to be disconnected.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #3 of 3 Old 10-05-2013, 07:58 PM
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I'd agree with the burnt antifreeze smell possibly being a bad heater core, but that has nothing to do with where the heat / air blows out of the vents.

You're probably looking at a stuck or disconnected blend door actuator. Depending on year of your truck its either vacuum or electrically actuated. Easiest way to tell is to look at the heater controls, if it has lots of vacuum hoses, its vacuum actuated. If not, its electrical.
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