AC Question Blows cold when stopped, stops while driving until it hits 60mph. - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 08-18-2010, 12:35 PM Thread Starter
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AC Question Blows cold when stopped, stops while driving until it hits 60mph.

My brother-in-law has a 2000 7.3 Manual. He is having a problem with the AC cutting out. It will work sitting still. When he shifts through the gears it will stop blowing cold air, once he hits above 60 mph it will start blowing cold air again. Once the truck drops below 60 it stops blowing cold air (blows warm air) until it comes to a dead stop. Has anyone ever heard of this before?
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post #2 of 6 Old 08-19-2010, 07:37 AM Thread Starter
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Nothing????
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post #3 of 6 Old 08-21-2010, 12:05 PM
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It may be low on 134a. Mine did the same thing so I put some in. use a gauge to make sure I did not over do it.
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post #4 of 6 Old 08-21-2010, 12:27 PM
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also may be A/C clutch, check airgap on clutch, shim if necessary


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post #5 of 6 Old 08-22-2010, 01:56 PM
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Adjusting Clutch Gap on the Ford FS10 Compressor

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post #6 of 6 Old 08-25-2010, 02:57 PM
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also check your coolant level. Ford trucks have a sensor if low on coolant or if cooling system gets above certain degree the a/c compressor shuts off. It happened to me and I thought it was low freon but no. It was low coolant.
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