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Old 11-02-2019, 10:53 AM   #1
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I have a 40í diesel pusher with a Caterpillar 8.3L engine with allison 6 speed and side radiator. Since I have had it, it has always tended to overheat on long grades with warm ambient air (>80F). Otherwise, the temp hovered around 185. Recently, on a drive to Utah, the Charge Air Cooler blew out. Overheating was a major issue on the grades, particularly at higher elevations. On returning to WI, I replaced the CAC, and decided to solved the cooling issue. I replaced the Radiator, anti freeze, and thermostat. Now, with an ambient air temp of 36 degrees at 60 mph, the coolant temp hangs around 205 on the level, with the hydraulic fan at around 20%. On a slight grade the fan goes up to 55%, but the temp holds. At idle, the temp goes down to 160. This is all with the heater on high, but that doesnít Seem to make much difference.

I am afraid to start south with the rig, because it seems like I have no reserve cooling capacity to handle longer, steeper grades at higher ambient OAT and higher altitudes. It seems like I spent a lot of money, and only made the problem worse.

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Old 11-02-2019, 02:59 PM   #2
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First, I don't own a Cat diesel. I have owned Ford diesels in pickup trucks before, though. I learned that if I replaced the coolant, I had to "burp" the air out of the coolant jacket in order to make it work correctly. Otherwise, the big bubble of air would act as a restrictor in the coolant flow. I used to remove the air by removing a head bolt in the back of the engine and turn the engine on until the air was removed. I have also heard that it was possible to get the air out by raising the front end of the truck pretty high. I hope this helps. Good luck!

2004 Tiffin Allegro 27.5 ft. P32 18,000 lb GVW. 8.1 liter. Workhorse chassis built May 2002. 24,500 miles. 2012 Jeep Liberty Toad. RVi2 brake unit.
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Old 11-02-2019, 07:30 PM   #3
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Recheck coolant levels. If OK test your fan control. I would think you fan speed would be much higher with temperatures of 205f. If your fan control is
electric controlled unplug the fan control solenoid. That should put your fan in max speed immediately. If it does not do not leave unplugged.
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Old 11-03-2019, 04:46 AM   #4
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Originally Posted by campgroundguy View Post
I have a 40í diesel pusher with a Caterpillar 8.3L engine with allison 6 speed and side radiator..
Cat doesn't make an 8.3L - did you mean to say that you have a "Cummins ISC 8.3"
Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift
*SMC-Bvr-Mnco Chassis/Suspsn/Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
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Old 11-03-2019, 07:36 AM   #5
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Originally Posted by CountryB View Post
Cat doesn't make an 8.3L - did you mean to say that you have a "Cummins ISC 8.3"
And many wonder why they cant get the correct parts ordered ???
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Old 11-03-2019, 08:40 AM   #6
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You are right HJ, itís a cummins. I deserved the remark. The coolant was refilled directly into the engine, I am sure there arenít any bubbles. I would like to know what the fan speed should be. This is a hydraulic fan, and I use a bluefire J1939 adapter to display engine parameters. It read fan speed in percentage.
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Old 11-03-2019, 12:25 PM   #7
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Some displays show current sent to fan solenoid in those cases normally as the percent of current drops the fan speed increases. If you are reading fan speed again normally you would be at 80% or more at 205f. I do not have your coach so I'm not going to say those numbers are 100% accurate but in general those should in the ball park. Hope that helps

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