A/c issue - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 08-25-2019, 08:21 PM Thread Starter
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A/c issue

2000 f350 with the conventional hvac system, had an issue earlier with a vacuum leak, fixed now if i use a/c or max a/c it blows ice cold then slowly quits blowing out the vents. Let it sit for a bit and then it works again. Nothing in the engine bay is freezing off
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post #2 of 6 Old 08-26-2019, 10:19 AM
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Your blower motor could be going out. A lot of us have already had to replace them. Very easy and cheap fix. I'm thinking about replacing mine just so I don't have to worry about it going out on a long hot camping trip.
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post #3 of 6 Old 08-26-2019, 10:27 AM Thread Starter
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I was thinking of replacing it just as a predictive maintenance. I forgot to add that the fan speed doesn't fluctuate, it just slowly quits blowing out of dash vents but blows out the defrost vents
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post #4 of 6 Old 08-26-2019, 02:56 PM
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You still have a vacuum leak(hose) or a bad vacuum motor on the vent selector -- usually when the vacuum leaks off the air will only come out the defrost vents -- tee a gauge into one of the lines so you can see what the reading is -- a hand pump would help in diagnosing the vacuum motors

" ice cold then slowly quits blowing out the vents"
Are you saying no air at all out any of the vents -- or air only out the defrost?
Cause that is a whole different problem
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post #5 of 6 Old 08-27-2019, 02:31 AM
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Not quite sure about the exact symptoms, but my first impression was that it works normally for a while then air flow gradually decreases. If youíre saying that no air is coming from the vents, but the blower is still operating at max speed it sounds like a restriction. It could be the evaporator freezing over. If thatís the case try turning off the compressor and see if the airflow gradually returns, and air is still fairly cool. Could be that ice restricts air flow until the ice over the evap starts to thaw.
If thatís the case:
Whatís the humidity?
Have you checked the freon charge?
Any noises? Maybe like a faint whistling? There is a small chance the expansion valve isnít properly metering refrigerant.
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post #6 of 6 Old 08-28-2019, 03:25 PM Thread Starter
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I believe the evaporator is freezing off, ill check freon charge and the orfice tube next week
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