NO HEAT! FREEZING HELP! - Ford Powerstroke Diesel Forum
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Old 02-05-2014, 06:38 AM Rookie

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not sure if this thread belongs here. i have an 03 f350 PSD 6 speed. last year my heat worked no problem. this year, FREEZING! the heat only kicks on if im on the freeway with the engine revd up. i dont understand? is it something to do with the vacuum? idling and im my way to work, im numb. this is not enjoyable... please any suggestions are helpful. thank you.
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Old 02-05-2014, 06:46 AM
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Check your coolant level...
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Old 02-05-2014, 07:10 AM
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You've got air or a gas (not fuel) in the system. It can only come from a few places, but unfortunately, the most common source in a 'no heat' situation is combustion gasses from blown head gaskets. A bad degas cap or coolant leak somewhere will contribute to it as well.
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Old 02-08-2014, 02:23 PM
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I have always read that is a sign of HG trouble as well.

Here is hoping you get lucky and it is something like vent doors not opening propperly
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Old 02-08-2014, 02:41 PM
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I have had the same problem as well. Came from a coolant leak and found coolant was low. So check your coolant

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