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Old 06-30-2015, 08:26 PM   #1
Join Date: Jun 2009
Location: Madison, Ga
Posts: 81
Source engineering fan blade

I have a 2000 Harney with a 3126b cat engine. Rear radiator. Was thinking about changing the fan blade to make it quieter and increase the HP.
Just wondering if any one has any input on this and was it worth it.
emailed Source Engineering and am waiting on a reply. Not sure they even make one for my coach,
Thanks for any input.

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Old 06-30-2015, 08:34 PM   #2
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I contacted Source Engineering about fans and all they had at the time were for the ISB or 3126 which wouldn't work for the ISC and side radiator we had at the time.
They should have something for the rear radiator 3126 you have.

2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
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Old 06-30-2015, 10:11 PM   #3
"Formerly Diplomat Don"
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Location: Moorpark, Ca.
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I installed one on my previous coach, 2005 Monaco Diplomat, rear radiator ISL 400. It doesn't increase horsepower, but returns horsepower that was used to turn the OEM fan. On the ISL, it was a 25HP increase/return. You could feel it under acceleration and when passing. On smaller engines, they get better results because they're turning faster. The ISC was said to get 40 HP.

I also looked at the Horton which used an electronic clutch. It was a lot more work and was no advantage when hot out or climbing.

There was no cooling loss with the Source Fan, it was identical to the stock fan. I would buy another if I had a rear radiator coach. I also added the DIGICR chip to my ISL which added 52HP. My 36' Diplomat was a rocket, even on the grades, towing my 5500 pound truck. As far as I could tell, there was .3 -.5 mpg.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
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Old 07-01-2015, 10:33 AM   #4
Join Date: Jun 2009
Location: Madison, Ga
Posts: 81
fan blade for Harney coach

Just talked to Source engineering and they said I couldn't use their fan because the cooling system on my coach required the bigger original fan for the needed air flow.
Just thought you all might like to know the outcome.
Thanks for all the replies. I sure wish I could have done this. Sure would have been nice just for the noise reduction.
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engine, fan

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