clutch fan surging - Ford Powerstroke Diesel Forum
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Old 08-03-2006, 04:34 PM
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clutch fan surging

Has anyone figured this out yet? I'm towing a trailer back from Alaska. On the return trip the clutch fan began surging when I'm accelerating. It does not do it if the AC or heater is off. It kicks on and off ten or twelve times before kicking off.. Before it started this it functioned normally--- when the temperature got to a certain point the cluth fan would engage and come on for a period of time and then when the motor cooled it would shut down. The sound of this is driving me nuts and I have taken it to three dealers whith the only result being that my wallet is thinner.....I have a friend in Ncarolina had the same problem. He changed the AC, and the clutch fan to no avail....He now drives a dodge! Any info would be greatly appreciated.
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Old 08-03-2006, 04:41 PM
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Does it only do it at a particular ambiant temp???
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Old 08-04-2006, 05:59 AM
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That is hard for me to tell. I do not see any significant change in my temp meter. It does not do it unless I'm towing. The interesting part is if you shut down the AC/heater it stops immediatly. It did not do this for the first 80,000 miles- it started all of a sudden. Also the computer is not showing anything wrong. I suspect that it is a senor somewhere but have no real clue..
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Old 08-04-2006, 06:15 AM
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the fan clutch on a 7.3 is mechanical. There is NOTHING electronic to affect it. It simply locks up when the engine compartment hits a particular temp.....either your fan clutch is bad or what you are feeling and hearing is normal operation, which is what im guessing the case is....
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Old 08-04-2006, 06:44 AM
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Try changing the termastate,those 7.3's used to eat them things up. If they are fuctioning to full capacity they will create or can create temp spikes.
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