Blower fan issue 04 F 550 - Ford Powerstroke Diesel Forum

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post #1 of 5 Old 07-03-2013, 03:45 AM Thread Starter
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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.

2004.5 F-550,4x4,6.0,auto,CTS monitored,
Performance Machine egr delete,caterpillar elc,blue spring, CTS Monitor,flat plate agm batteries,K8 code, super tow pkg. (4.88),twin line recovery wrecker.
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post #2 of 5 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.

2005 Excursion Limited 6.0L, Zoodad, Insight CTS w/Pyro and fuel pressure, blue spring, Coolant filter, Rancho RS9000xls w/ MyRide wireless, DC power alternator, Tekonsha P3, Door seal mod. 08+ style tow mirrors, Stainless braided brake lines, Powerslot cryo rotors, Hawk LTS pads, Britebox So far.....
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post #3 of 5 Old 07-11-2013, 12:57 PM Thread Starter
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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

2004.5 F-550,4x4,6.0,auto,CTS monitored,
Performance Machine egr delete,caterpillar elc,blue spring, CTS Monitor,flat plate agm batteries,K8 code, super tow pkg. (4.88),twin line recovery wrecker.
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post #4 of 5 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.

2005 Excursion Limited 6.0L, Zoodad, Insight CTS w/Pyro and fuel pressure, blue spring, Coolant filter, Rancho RS9000xls w/ MyRide wireless, DC power alternator, Tekonsha P3, Door seal mod. 08+ style tow mirrors, Stainless braided brake lines, Powerslot cryo rotors, Hawk LTS pads, Britebox So far.....
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post #5 of 5 Old 07-15-2013, 04:06 AM Thread Starter
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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.

2004.5 F-550,4x4,6.0,auto,CTS monitored,
Performance Machine egr delete,caterpillar elc,blue spring, CTS Monitor,flat plate agm batteries,K8 code, super tow pkg. (4.88),twin line recovery wrecker.
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