AC Issues - Ford Powerstroke Diesel Forum

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post #1 of 3 Old 08-17-2010, 04:28 PM Thread Starter
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AC Issues

2008 F250 CC 4x4 - 34k on the clock. Been having AC issues where i would be driving, air blows cold, but as soon as i take my foot off of the fuel, it blows warm humid air. then when back on the fuel, air works again. it happens for about 5-10 seconds after i take foot off fuel. at stop, air works fine and under pressure it works fine. i have also been noticing when i first run the truck in the am, the clutch fan?? makes a loud roaring sound... is that normal? could that be the issue?

Its been to the dealer, repressurized, they even installed a new PCM! Yet, it didnt fix it. good service but problem not fixed yet. any ideas? its already been in the shop close to 14 days for this STUPID issue.
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post #2 of 3 Old 08-21-2010, 11:49 AM
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My AC sucks large.

My suggestion would be to have the fan checked for operation, and see what the clutch is doing when you lift on the pedal. I'd put a test light across the terminals of the AC clutch and move the actual LAMP inside the cabin to see if the PCM is turning off the a/c clutch or if it's a mechanical failure.

Watch the ACCS PID when it happens, too. (Air Conditioning Clutch Switch) And see what happens when you lift on the loud pedal to that PID.

My truck doesn't do specifically this, mine just sucks... Recharged and dried system, no avail. The older super duties you could friggin refrigerate stuff in... the P356 chassis (08-10MY) the air is just pathetic in. I hate it. It blows cold, but does not cool the cabin.

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2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.
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post #3 of 3 Old 08-21-2010, 05:37 PM Thread Starter
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Thanks for the info!!! I will print it out and give it to the service tech... since they are pretty much helpless without their trusty Ford computer giving them a code to look up....
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