fan clutch?
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Senior User
Joined: Jul 2006
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fan clutch?
Hi
Yesterday, out of the blue, the truck while driving at speed on the interstate, started roaring. It seemed that suddenly the engine had a great load on it and was attempting to climb a large hill, none of which was the case.
I noticed that rpms were about where they usually were as were temps.
After thinking about it, the last time I saw this was in the 80's..and it was a fan clutch on my GM diesel.
My fan clutch has so much resistance stone cold that it can barely be turned by hand... I would consider it "a ton of resistance".
Is my diagnosis correct on this fan clutch? If so, is NAPA a good source of clutches?
Yesterday, out of the blue, the truck while driving at speed on the interstate, started roaring. It seemed that suddenly the engine had a great load on it and was attempting to climb a large hill, none of which was the case.
I noticed that rpms were about where they usually were as were temps.
After thinking about it, the last time I saw this was in the 80's..and it was a fan clutch on my GM diesel.
My fan clutch has so much resistance stone cold that it can barely be turned by hand... I would consider it "a ton of resistance".
Is my diagnosis correct on this fan clutch? If so, is NAPA a good source of clutches?
Senior User
Joined: Aug 2009
Posts: 191
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From: Banner WY Pop 42, yes 42
When you describe a "ton of resistance" that sounds like too much. If your fan clutch is locking up, you are right, it will sound like a jet engine when you are at highway speed. I therefore think you are correct about what is wrong. Yes, NAPA or most other part stores are fine. I don't think this needs to be a OEM part.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
Hi
Yesterday, out of the blue, the truck while driving at speed on the interstate, started roaring. It seemed that suddenly the engine had a great load on it and was attempting to climb a large hill, none of which was the case.
I noticed that rpms were about where they usually were as were temps.
After thinking about it, the last time I saw this was in the 80's..and it was a fan clutch on my GM diesel.
My fan clutch has so much resistance stone cold that it can barely be turned by hand... I would consider it "a ton of resistance".
Is my diagnosis correct on this fan clutch? If so, is NAPA a good source of clutches?
Yesterday, out of the blue, the truck while driving at speed on the interstate, started roaring. It seemed that suddenly the engine had a great load on it and was attempting to climb a large hill, none of which was the case.
I noticed that rpms were about where they usually were as were temps.
After thinking about it, the last time I saw this was in the 80's..and it was a fan clutch on my GM diesel.
My fan clutch has so much resistance stone cold that it can barely be turned by hand... I would consider it "a ton of resistance".
Is my diagnosis correct on this fan clutch? If so, is NAPA a good source of clutches?
Before you buy a new clutch, I would suggest you carefully inspect the radiator for blockage. I have seen amazing photos where pests will build a substantial nest of debris in between the coolers and cause the problem you describe. Worth checking out. The activation temp is around 212-215 degrees but you won't see any movement on your dash gauge.
When the fan locks up it draws about 25hp. It moves a LOT of air under those conditions.
Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
The fan noise you describe is just the way mine sounds. I will also get surging. I can't speak to the resistance because I have never check it... When mine first did it several years ago, I thought something blew.....
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hi
the first time you hear it...it sounds like something catastrophic just happened. Its been almost 30 yrs since I last heard it, in a GM 5.7 diesel no less.
the first time you hear it...it sounds like something catastrophic just happened. Its been almost 30 yrs since I last heard it, in a GM 5.7 diesel no less.
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