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markmiiler · 10-13-2015, 06:19 AM

I have installed a scan gauge in our MH to monitor water temperature. I have noticed that the coach's temperature going down the road with relatively light load with outside ambient temp. at 75 degrees heating up to 210.The fan clutch engages and cools down to 175 and then will cycle the same temps. Is this to high of an operating temperatures? Do I have a bad sensor which triggers the fan clutch? I did notice that when outside temp is higher it cycles quicker but still fluctuates 210 to 175.

TeJay · 10-13-2015, 06:32 AM

What use to be standard cooling systems has changed a lot over the years. They are operating at higher temps and are much more important than before the computer age.

We have a 2013 F-53 gas chassis and a scan gauge. Our temps run very steady all the time from about 199 to 202 or 203. I can't hear any clutch fan engaging or disengaging. I know it has one but i can't hear it or notice a temp change when that happens.

The DP may operate differently with different parameters and expected temperature fluctuations. If these temp changes are different from before then maybe something needs looked into. If it's been doing that since you've owned it then maybe not. I know how our coach operates. If and when those temps start changing then I'll know there's something not working as it did before.

That's how I'd approach troubleshooting your system. If that's how it has always worked then OK. If it's different then maybe not. You just installed the scan gauge so now you have a better idea of how the temps have been fluctuating over the time you've owned the coach. So it may not be an issue, but just new information for you to understand.

TeJay

markmiiler · 10-13-2015, 07:05 AM

TeJay
We traded our gasser for this DP in February with 18k on it . I do not have a regular operating temp as we have always watch temp gauge go half to 3/4 which concerned me hence the scan gauge. We have put several thousand miles on coach so far with no overheating but still cautious.

RCtime · 10-13-2015, 07:14 AM

Same thing happened to me (Cat 3126). It was the thermostats sticking Check your manual, on the Cat. its replacement every 3 yrs.
On your's ?:

Cbones · 10-13-2015, 07:20 AM

Quote:

Originally Posted by markmiiler

I have installed a scan gauge in our MH to monitor water temperature. I have noticed that the coach's temperature going down the road with relatively light load with outside ambient temp. at 75 degrees heating up to 210.The fan clutch engages and cools down to 175 and then will cycle the same temps. Is this to high of an operating temperatures? Do I have a bad sensor which triggers the fan clutch? I did notice that when outside temp is higher it cycles quicker but still fluctuates 210 to 175.

Perfectly normal operation. On long hard pulls you will see it climb to 220 and then cool down. On flat roads, it will vary between 190-210. My guess is that you have an electrically operated fan clutch, and it is cycling within its normal range.

FIRE UP · 10-13-2015, 10:22 AM

Mark,
Just wondering, you don't say what kind/make/model/engine/year/chassis of coach you have. 99.999999% of most diesel pushers DON'T have fan clutches so, I'm assuming yours is a side radiator model.
Scott

1ciderdog · 10-13-2015, 11:33 AM

My 2004 runs about 190 unless it is very hot outside or I'm climbing a steep hill or both. Rarely does it get much above 210.

markmiiler · 10-13-2015, 04:24 PM

My signature has year make and model but Cummins 360HP pushing 40 foot rear radiator on freightliner chassis.
I can hear the fan engage at 210 with quite a roar till it cools to 185

Cbones · 10-14-2015, 06:36 AM

Quote:

Originally Posted by FIRE UP

Mark,
Just wondering, you don't say what kind/make/model/engine/year/chassis of coach you have. 99.999999% of most diesel pushers DON'T have fan clutches so, I'm assuming yours is a side radiator model.
Scott

Scott,

While I usually agree with most of your posts, your statement that 99.99999% of dp's DON'T have fan clutches is incorrect. The vast majority of rear radiator pushers and many side radiator configurations utilize an electro-viscous clutch unit to control fan speed.

sdlowe11 · 10-14-2015, 08:37 AM

Quote:

Originally Posted by markmiiler

My signature has year make and model but Cummins 360HP pushing 40 foot rear radiator on freightliner chassis.
I can hear the fan engage at 210 with quite a roar till it cools to 185

This is exactly how my 2008 Tour with 400HP rear-mounted radiator runs, and has since I purchased it new. I'll agree with the others who say this is normal operation. I know folks who wish theirs ran in the range yours does!