Well I have a question for ya'll. I've been driving an 06 F550 6.0 4x4 auto service truck for my company. anyways, the a/c works pretty much all the time and then randomly will blow hot air. I believe it's the blend door. My company took it to the stealership 3 times and they can't see a problem with it. But I can see there is a problem as I leave the field and its blowing hot air so I'm asking for ya'lls help. What's a good test for the blend door? and is this a common problem on these?

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so just researched and ay there isn't a blend door in these? and if not then i'm definately lost. what controls whether it blows hot or cold air. i need to fix this before i go out on a serice call tomorrow

 

Check to see if your clutch fan is comeing on at idle, had same problem with mine (03 f550) it ended up being the clutch fan

 

Ok ill check it out and let you know here in a lil while