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Old 07-01-2013, 12:11 PM   #1
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Silverleaf vs. Coach Gauges

Re: Coolant Temperature. Coach gauges (2007 Country Coach w/Cummins 400 ISL) run cooler than Silverleaf by about 9-10 degrees. Question: Is it the coach gauges or the Silverleaf that signal the Engine Warning light to come on? When Silverleaf coolant temp reaches 225, Engine Warning light comes on while coach gauge is around 215-216 (always runs 9-10 degrees cooler than Silverleaf). As soon as heavy climb is over, temp immediately returns to 185-190. Have blown a head gasket and an intercooler, had the fan motor and controller replaced. Not even sure if these temps are all that high, particularly considering we hit these temps when outside air temp was 105 degrees and only on steep grade. Second question: Can Silverleaf coolant temp be calibrated to match coach gauge? Any help would be appreciated. (Silverleaf model is VMS 240 CL)

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Old 07-01-2013, 01:23 PM   #2
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The ISL400 had some issues with cooling on a freightliner chassis under the conditions you mentioned. There was a recall that changed the htdaulic drive oil from Dexron to straight 5w40 oil and changed out the oil cooler to handle the increased oil pressure.
225 degrees sounds about right for a warning. I believe overheating occurs at 235 degrees and result in a check engine ligjt. I would trust the Silverleaf readings as they come directly from the ECM.

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Old 07-01-2013, 01:59 PM   #3
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I don't know if the two readings are taken from two different sending unit sensors, or if they share one.

If there are two sending unit sensors, I doubt if it's unusual for senders to vary by a 5% factor, which they seem to be doing.

If they are sharing a sending unit sensor, one must assume that either the gauge or the engine computer/Silverleaf or both are leading to the 5% differential factor.

In either case, the temperature readings under heavy load while climbing grades seem to be OK unless there are other signs of overheating or other problems.
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Old 07-01-2013, 02:08 PM   #4
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I'm with Harry B, I would trust the Silverleaf readings. I have the SilverLeaf 330 but I have a Cat C9. My fan come on at 206deg plus I can hear it and I can see it drop down to 196deg real quick then it works it way back up.
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Old 07-01-2013, 04:46 PM   #5
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You might want to consider a change in your driving habits. When climbing grades, force a downshift and keep your engine RPMs in the 2100-2200 range. The engine will actually run cooler at the higher RPMs.
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Old 07-01-2013, 05:04 PM   #6
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There are two sets of sensors, one for the engine ECM and one for the dash gauges. Trust the Silverleaf info as it come from the ECM. The ECM signals to turn on the warning light.

Your motor should run about 195 and the fan controller should turn the fan to high when the temp gets up into the 205 range.

I don't think the Silverleaf can be calibrated as it is only reading ECM data.

Dash gauges should be used for amusement purposes only when you have Silverleaf.

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