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- เผยแพร่เมื่อ 29 ม.ค. 2025
- This is an explanation of the hydraulic fan drive system on my 2002 Blue Bird All American Rear Engine. This system is unique compared to a belt driven fan controlled by a thermostatic, electric, or air controlled fan.
Any questions? Let me know, or let me know if I have mis-stated anything.
The inspiration for this video came from when I was fixing a problem with the fan control circuit. I read all about the system to understand how it worked, to understand how to diagnose and fix it. The fan was running at max output all the time. I had found that the charge air override solenoid was not getting power, so I had to trace wires. All fixed now.
Who likes my awesome weld job at 0:25? It was welded previously, and it broke, so I just laid on a thick, nasty weld. I'm confident in it.
GREAT video! This is almost identical to the setup we have here on our UK buses, although ours seem to always be running hot and make a much louder sound. Us Bus Enthusiast's have called it "Hoovering" haha.
Seen this happen a lot where i live (Italy) too, but i think it's mainly bad maintenance practices where, instead of fixing cooling system issues such as dirty/seriously worn radiators or worn water pumps, they just bypass the control system and let the cooling fan roar like there's no tomorrow, and that's it. Sometimes they get them fixed properly, but that's pretty rare occurrence, making it pretty clear that it's just a matter of penny pinching
Awesome job. I would love to see the Air Brake System and how all that works. Like the how the tanks work and maybe even the air door?
Dang it! I just learned something new on a Saturday.
@Wolf0r- I haven't had the pleasure, but this one has some rot, and will probably need to be changed in the next few years. I can't wait.
Very good video, but I must raise a significant issue. The narrator continually calls the fan drive motor a pump. It's not a pump, it's hydraulic motor. As he explains at the beginning, the power steering pump provides the hydraulic power and is located at the rear of the engine. The motor is what drives the fan.
Would you happen to know the fan drive controller valve
oh yeah i gotta tell, when the fan spends faster it sounds like its running a/c in the bus like other buses get loud on the first driving after like a day of sitting and so is the AA a cummins I6?
So if the fan does not change speed when the CAOS is unplugged the CAOS is bad?
That's my question as well. Did you ever get an answer?
How can I test the hydraulic/power steering cooling fan that is under the bus behind the rear drivers wheel?
this may be a dumb question, you were talking about needing cooler air? how about refrigerating that air?
So if I unplug the sensor and nothing happens what should I replace??
Thanks
Hello, my family and I are stuck right now with overheating issues. We are trying to figure things out on our bluebird home. Please if there's any chance we could talk. We're in desperate need of help due to heat exhaustion and our bus not running right
We have a problem with the hydraulic cooling fan of the tractor, what could be the problem?
Tractor new holland RG 200. B
are you familiar with a 96 bluebird system.theres a solenoid in this system,i dont have a book,but at road speed above 55 mph,it runs very warm.
I have a question not really about the circuitry but wondering if you knew what type of oil the power steering pump requires?
This particular set up uses 10W-30.
@knightrider1545, 5.9Liter, 359 cubic inch, Inline 6 Turbo Diesel.