03 7.3 F-250 at Idle A/C blows cold air. Start driving and A/C begins to blow warm air. I can accelerate hard like passing car and A/C will start blowing cold air ,as I slow down and start crusing again A/C will go back to warm air. Come to light A/C will start blowing cold again. HELP Idle ac cold ,driving crusing warm air,accelerate hard blows cold.

 

Sounds like the air gap in the clutch might be a little much, I would try adjusting it first.

SpringerPop's Compressor Clutch Air Gap

 

same thing my old 99 did. the air gap was the problem..

 

Just fixed mine about five days ago...doing the same thing...it was the air gap. Took about 5min to fix and has been working ever since.