Join Date: Oct 2009
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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.
Ford Senior Diesel Technician
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.