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Old 04-04-2012, 09:03 AM   #1
Senior Member
Join Date: Apr 2003
Location: Rochester, MN, USA
Posts: 371
Update on Hydraulic fan problem

About a year ago I asked for advice about correcting a problem with the hydraulic fan motor that cooled my side radiator. After several "No Helps" at dealerships, advice from IRV2 and shade tree diagnosis the problem was found. The wire in the connector to the air conditioner sensor was not seated properly. This caused the Fan circuitry to default to full speed mode at all times.

Prior to the fix my mileage over 25K miles was 6.2 MPG.
After the fix my mileage over 5K miles was 7.1 MPG.
This was a 14% improvement and over the 5K miles saved about $400 in fuel costs.
Bottom line is that those big cooling fans take a LOT of power

Thanks again for all your help
Have a nice day - Darrel

2007 3912 KSDP w/350HP ISL Cummins
2003 Grand Cherokee toad w/M&G Brake
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Old 04-04-2012, 09:20 AM   #2
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Newmar Owners Club
Join Date: Dec 2008
Location: Spokane, Washington
Posts: 1,166
Thanks for the update.

Ron... WB7DJV
2000 38' Dutch Star | 2006 Grand Cherokee | SilverLeaf VmsPc Engine Monitor | TST TPMS
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Old 04-04-2012, 07:33 PM   #3
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Thanks Darrel will keep in my files looks like it was well worth the effort, safe travels.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
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