My 07 powerstroke overheated the other day while pulling a trailer and since then I noticed the AC getting hot at idle and there is a thud when it engages along with a 500 rpm drop in power?
Hi, I am John Mc, a Ford dealer tech. I hope I can help you quickly and accurately. One moment while I work on your problem.
It sounds like your fan clutch has failed. This is common on these engines. Also make sure your coolant bottle is full. If not you may have a bad egr cooler or damaged head gaskets. From your description you probably just have a fan clutch issue.
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Sorry for the delay, had to drive home from work.
I am thinking what you might be hearing is the fan clutch kick. The compressor doesn't really draw enough power to kick that hard unless it was locking up. This is possible but then you would have two problems as a locked up compressor shouldn't cause an overheat condition.