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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 08-02-2019, 04:04 PM   #1 (permalink)
dave-lly
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Fan clutch and A/C

Ok, pulled the camper from eastern KY to Williamsburg Va, via I64, a hard pull. I've been thinking about replacing fan clutch with severe duty but haven't. After getting to Virginia I decided to try and find one as there are several mountains to pull on the way home. Of course getting one last minute I could only find a Murray at O'Reilly's, so I bought it. A/C blows hot at idle after I put it on. Also fan worked flawless on rolling hills,bkicking in at approximately 203 taking temp down to 190. But wouldn't you know, when you hit the mountains 203 creeps by, then 213 creeps by and fan operates no better than factory. I don't need a fan to kick on after it gets hot, I need one to prevent it from getting hot. I also cleaned rad thoroughly prior to trip. Installed new water pump approximately 1000 miles ago. Any ideas, would a hayden work better?

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Old 08-02-2019, 05:41 PM   #2 (permalink)
davester
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Sounds like your problem isn't the fan, maybe the cooling stack may need to be cleaned? Any fancy do-dads up front that may be impeding air?

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Old 08-02-2019, 06:04 PM   #3 (permalink)
Ron Nielson
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Well, I do think you want a fan that kicks on after it gets 'hot' if you're considering 210-215 hot. I consider that normal and in the desired temp range for a Duramax. Now, if I were in a 1958 Chevy with a 348 that was notorious for overheating, I'd be worried at 210, but not a Duramax. You could put in a lower thermostat if you wanted cooler, but you'd pay for it all the time in wasted fuel. Takes more power when that fan clutch locks up, and the longer it's on, the more power you use, and the more fuel you will use, and it you want it on at 180, you can find one that will do that, just 'gotta pay if you want to play'.
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Old 08-02-2019, 08:52 PM   #4 (permalink)
dave-lly
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It gets to 230 before the fan kicked on, on the long hard pulls. Fan worked fine on rolling hills. Yes I cleaned the rad before I left. I clean it every year.
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Old 08-02-2019, 08:59 PM   #5 (permalink)
dave-lly
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And yes I do want the fan to kick on after it gets warmer, I consider 230 warmer than I'd like. But my point being that I'd wished it wouldn't let it get that warm and at least kick on at 215/220 the warmest.
Anyway this fan isn't working the way it should because it's not cooling the A/C condenser properly at idle. I may try the Hayden or go with AC Delco original.
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Old 08-06-2019, 12:12 AM   #6 (permalink)
pj951
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My conclusion was that the Hayden and Murray fan clutches were the same part. They share a part #2843. After a week of running a Murray fan clutch I bought a new GM part. Couldn't take the noise of the Murray, it did run a lot more.


I also experienced poor cooling at idle and discovered the AC system had 0.5 lb of refrigerant left of the 1.5lb original charge. Big improvement after recharging.
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