Blower fan issue 04 F 550 - Ford Powerstroke Diesel Forum
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  #1  
Old 07-03-2013, 03:45 AM
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Blower fan issue 04 F 550

I'll start by saying a/c compressor is new, blower fan bench test good, a/c defrost system was operating fine. 5 days ago couldn't control air vents, easy fix, vacuum pump failed, replaced problem fixed. 2 days later turn on a/c no fan at all and a/c comp. not kicking in. Fuse and relay good, no power to fan under hood. Pulled resistor was scummy but ohm'd like it was ok. Is there another fuse ? Or should i be looking at dash fan switch control ? Tks.
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Old 07-04-2013, 02:18 PM
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If equipped with ATC my bet would have been the resistor. But you already checked that. They been known to produce all kinds of strange symptoms when they go out.
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Old 07-11-2013, 12:57 PM
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fyi,ended up I found it to be the fuse to the resistor ,yes,the blower fan has it's own fuse and relay,the resistor has it's own fuse #28 on the factory diagram,it wouldn't hold a 10amp fuse with old resistor,installed new resistor and fuse didn't blow up anymore,,was a nice brain teaser for a day of underdash follies! lol
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Old 07-11-2013, 09:57 PM
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Thanks for the update. I didn't know the resister had it's own fuse, I just learned something new. Glad you're hvac is back in business.
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Old 07-15-2013, 04:06 AM
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ya,thanks,I like to update if it can help someone else,so many useless threads in the archives/search here that have no ending,they just die and fade away.
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