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Old 07-01-2021, 05:24 PM   #1
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It was very, very hot last weekend (116F), and while pulling a boat and near capacity in the rig itself, my rig performed admirably until I started pulling a grade. The temp gauge would climb until I stopped for a bit. It didn't seem to matter if I was driving slow or fast. It didn't happen on the way to site on Thursday (much cooler day).

I recently replaced the surge tank, everything went well - is there an issue with these units trapping air somewhere?
Are there issues with temp regulators? (Thermostats)
I have heard that my 330Cat has 2 regulators, what's the second one for?

I plan to clean the inside of the radiator this weekend, but I'm not sure what else to look at.


Thanks in advance!
2003 Fleetwood Discovery 39L
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Old 07-01-2021, 05:46 PM   #2
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Caterpillar used two different water pumps on the 3126B/E engines , if your rig has the water pump driven by a small V belt you need to make sure the belt is tight .
Two " Regulators " not sure exactly why , but think that a single regulator the opening was too small to provide coolant flow for times when max flow to the rad was required .

You didn't mention side or rear rad configuration , and if you were manually selecting a lower gear to keep the RPM up around 2,000 on your climb.

BTW; Cummins says to clean the rad in a rear rad chassis , annually or every 7,500 miles , I think that's a good idea for any rear rad coach.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 07-01-2021, 06:38 PM   #3
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I had an 04 Winnebago Journey with a cat that I was having overheating issues.
The slobber tube from the engine was misting oil that was stopping the stacked CAC and Rad up. You need to check both the front and in between them. I cut an opening in the top of the shroud for access. ( I found this tip on Google. ). Also extend the slobber tube to the rear of the coach. I have a few pictures of the shroud it interested PM me and it will send

Good luck with it
John & Glenda
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Old 07-02-2021, 11:02 AM   #4
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My crankcase vent is extended past the radiator, so that's no issue.
It's a rear radiator.
I let the transmission choose gears for most of the trip, up until the last two grades, I downshifted early on them and kept the RPM around 2000-2200, that seemed to help, but still had the issue.

Pulling the rig out to clean the radiator Saturday Morning.
2003 Fleetwood Discovery 39L
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Old 07-02-2021, 11:12 AM   #5
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Yes, the front of the CAC need to be cleaned annually. More often if in areas with a lot of dirt, leaves, etc that can block air flow.

Manually choose a gear where you are 2,000- 2,200 RPM AND (an important AND) just under WOT.

Said another way, you want to be able to floor it and have just a little bit of acceleration left.
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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Old 07-23-2021, 06:49 PM   #6
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Mine would overheat for no reason at all. At first it was seemingly on steep grades or in hot weather, then it became completely sporadic. Mine was a failing fan clutch and found out it was fairly common. I have a 2008 rig, Fleetwood Discovery. The part itself isn’t that big a deal but getting to it to replace it is a huge deal. When you crank your rig up, tie a few ribbons to the back grate and ensure they’re blowing horizontally. If not, it’s your clutch or a slipping belt.
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Old 07-23-2021, 06:59 PM   #7
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You need to Lean to Drive your Rig on Grades- Down Shift and keep the RPM's way up-- Don't be in a Hurry- Continue to downshift as necessary to keep the RPM's around 2300 - There's a Governor on your Engine so don't worry.
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heat, heating, overheating

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