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Old 07-21-2014, 09:42 AM   #1
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Radiator fan slow to engage

On my 2910 390bh-50, my last 5 starts have resulted in a delayed start of the radiator fan. The temperature climbs, sometimes to near overheat, before the fan brings the temperature down to about a quarter. I could mitigate the temperature climb by turning the heat on till the fan engages. Then I can run all day. Any others with similar experience with a solution?
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Old 07-21-2014, 09:44 AM   #2
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Meant 2010
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Old 07-25-2014, 12:17 PM   #3
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The issue has gotten worse. On our 1300 mile drive from pittsburgh to houston I could trick the radiator fan into coming on. The closer we got to home the worse it got. Now, on the way from home to camping world, the fan won't come on at high speed and the engine is over heating. Waiting on a tow...
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Old 07-25-2014, 12:58 PM   #4
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Quote:
Originally Posted by kingwood390bh View Post
The issue has gotten worse. On our 1300 mile drive from pittsburgh to houston I could trick the radiator fan into coming on. The closer we got to home the worse it got. Now, on the way from home to camping world, the fan won't come on at high speed and the engine is over heating. Waiting on a tow...
Find the leads on the fan(s) cut the sensor out of the circuit and wire a switch on it so you can manually control it OR wire it to come on with the ignition switch and it stays on as long as the switch is on.
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Old 07-25-2014, 10:03 PM   #5
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I tried to figure the direct wire technique but access was difficult. Good Sam was willing to tow my Berk to the closest facility that was "willing and able" to work on it. Instead, I let it cool down and limped it to a facility that could solve this problem. The fan failed completely, and without it, the motor struggled to stay below 210 degrees, even at flight idle. I will post the solution and the cost when I find out.
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Old 08-11-2014, 10:23 AM   #6
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Update. The fan is a Freightliner part and is out of warranty on my 2010. So I'm looking at about $800 for the fan assembly and possibly $1200 in labor costs.
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Old 08-11-2014, 04:15 PM   #7
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Wow! $1200 in labor! How many hours of labor is involved and what do they have to do to replace it?
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Old 08-11-2014, 05:23 PM   #8
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The labor is just an estimate. When he figures out what it is exactly he'll use the book value. This failure was new to my mechanic
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