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LX and LXI (Unique Issues) If you have a unique issue with your LX or LXI model coach and it can't be answered in one of the other forums here, then this is where you can list it, WITH THE EXCEPTION OF THOSE ISSUES INVOLVED WITH ANY LAWSUIT.....list your LX and LXI Parts here too.

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  #1  
Old 06-03-2019
BobP13 BobP13 is offline
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Default Cummins ISM engine temps

When towing up a long incline my engine temp starts to creep up to about 210 degrees. At what temp should I start to worrying?
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Bob Padgett
Charlotte,, N.C.
2001 40' LX

Last edited by Dieselbird01; 06-05-2019 at 03:52 PM. Reason: Changed "Cummings" to "Cummins"
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Old 06-03-2019
rshrimp rshrimp is offline
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Mine never does that. If it hits 190 that is very rare.
I'd be looking for an issue with the cooling fan
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Old 06-03-2019
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Will your fan go to high speed when you turn on your air conditioner??
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Old 06-03-2019
BobP13 BobP13 is offline
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Thanks Randy. That's what I wanted it know.
I'm not exactly sure how to check it though. I do know that when its at idle and I turn on the a/c, the engine fan kick into high speed....so I know it works. I have no idea however if when I'm driving down the road and it's under a load if the fan is still in the high speed mode.
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Old 06-03-2019
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Well the next time you start to see the temp rise turn on the AC. If it continues to rise it could be the radiator. If the temp starts to drop it the fan speed control.
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Old 06-03-2019
BobP13 BobP13 is offline
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That makes sense. I'll try that next. Thanks
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Old 06-04-2019
rshrimp rshrimp is offline
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What Rick said!
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  #8  
Old 06-04-2019
BobP13 BobP13 is offline
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Thanks Rick and Randy. I drove a couple of hours east from Charlotte to Pinehurst NC this morning where the topo it is pretty much flat. But on one slight incline the temp went from 180 to 185, I turned on the a/c and it quickly dropped back to 180. Maybe it was just a coincidence or my imagination but it did drop 5 degrees.
Any idea where the fan speed control switch may be located? Or how to check it if I do find it?
Thanks again.
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2001 40' LX
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Old 06-04-2019
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Quote:
Originally Posted by BobP13 View Post
Thanks Rick and Randy. I drove a couple of hours east from Charlotte to Pinehurst NC this morning where the topo it is pretty much flat. But on one slight incline the temp went from 180 to 185, I turned on the a/c and it quickly dropped back to 180. Maybe it was just a coincidence or my imagination but it did drop 5 degrees.
Any idea where the fan speed control switch may be located? Or how to check it if I do find it?
Thanks again.
Open the rear hatch. Follow the 2 small hydrolic lines from the fan motor toward the hatch. Where those lines connect to a block, that’s the control I think b
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Old 06-04-2019
BobP13 BobP13 is offline
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Ok got it. It appears that the two hydraulic hoses go from the pump to a temp sensor located in the top radiator pipe, then down to a switch with two wires. I'm assuming that the temp sensor sends a signal to the switch which in turn activates the fan speed?
Learning more every day! Thanks again
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