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Old 07-19-2018, 02:13 PM   #1
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Engine Radiator Cooling Fans

2001 Winnebago Journey 36LD Cat C7
Question Preface: When it comes to Electrical I'm Lost.
Prior to starting out on our last trip I noticed that the inverter/charger panel inside the coach was not lit up so I started checking fuses inside the coach. All was good. Then I read that there is a fuse on the inverter/charger itself so I reached into the outside compartment (one full arms length) to push the fuse in and inadvertently switched off the inverter/charger. We set off on our trip and all went well until we had a fairly long climb. We then got a buzzing sound from the dash and I believe a "low water" warning. I immediately stopped and let the engine cool. Looking into the engine compartment I noticed that the Hydraulic Reservoir tank was bubbling and the Coolant Surge tank also. After figuring out that I had turned off the inverter/charger by mistake I turned it back on. We completed the rest of the trip with the dash buzzer and "low water" coming on then off but with no overheating of the engine or bubbling in either surge tank. (I suspect the coolant sensor is either shot or needs cleaning)
My question is: Could the radiator cooling fans and transmission cooling possibly be wired through the inverter/charger?. If so, is this normal?.
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Old 07-19-2018, 02:18 PM   #2
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They will do that on a climb if your water is at the minimum mark. Mine did it last week. Added about a quart to the tank and all is fine. I have mine right at the cold max mark.


And no the inverter is not wired to the fans
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Old 07-19-2018, 02:25 PM   #3
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Steve, Does the bubbling in those tanks affect the quality of the fluids?, and should the inverter/charger be off or on all of the time?.
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Old 07-19-2018, 02:27 PM   #4
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The radiator fan on your CAT is belt driven by the engine. Nothing on the chassis side of your coach has any connection with the inverter/charger.
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Old 07-19-2018, 02:30 PM   #5
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"My question is: Could the radiator cooling fans and transmission cooling possibly be wired through the inverter/charger?. If so, is this normal?"


Uh...no, this is weird. The inverter/charger does two things, neither of which is related to the cooling fans. The inverter inverts 12vdc into 120 vac so you can run your 120vac blow dryer off the 12vdc battery. The charger turns 120vac shore or generator power into 12vdc to charge the batteries and supply the 12 volt system to the COACH, and maybe the chassis but only if the alternator is not producing power and the shore or generator is. Cooling fans SHOULD be a chassis system, powered by the engine's alternator and backed by the chassis battery.
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Old 07-19-2018, 02:31 PM   #6
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Chris, Ok I see, but why would I get the buzzer/light and bubbling if the fluid levels were correct and the temp gauge indicated no problem?.
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Old 07-19-2018, 02:34 PM   #7
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Thanks Tony, I get it now as far as the separate systems are concerned. Should the inverter/charger be switched on all of the time?
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Old 07-19-2018, 02:39 PM   #8
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On mine I leave the inverter on at all times because I have the residential refrigerator. Only time it is off is when it is parked somewhere and not plugged in. I had the bubbling in my Journey and all was fine.
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Old 07-19-2018, 03:19 PM   #9
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Thanks Steve, thank you all...
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Old 07-19-2018, 03:47 PM   #10
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Quote:
Originally Posted by Golfinscorp View Post
Chris, Ok I see, but why would I get the buzzer/light and bubbling if the fluid levels were correct and the temp gauge indicated no problem?.

Try adding some coolant--up to the MAX level when it's cold. The low coolant signal may be triggered when the coach is on an angle and the tank isn't full.

The coolant surge tank is not an overflow tank--it's part of the pressurized radiator system.
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Old 07-19-2018, 07:57 PM   #11
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When you pulled over to cool down you did not shut it down did you?
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Old 07-20-2018, 08:38 AM   #12
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Chris, I forgot to mention that since this episode, each time we drive it, even on the level, the buzzer sometimes goes off and the dash light appears. Sometimes the buzzer stays on sometimes it stops after a while.
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Old 07-20-2018, 08:39 AM   #13
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Bigb56 yes I shut it off.
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Old 07-20-2018, 08:58 AM   #14
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Quote:
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Bigb56 yes I shut it off.
I'll answer that one .

The condition is called " after boil " ; once the engine is shut down during a hot or over heat condition , the circulation /cooling of the fluids stops and the heat of the cast iron transfers to the fluids ; boiling them. The engine coolant should not be bothered by the boiling , hydraulic fluid condition /color should be checked to insure it hasn't degraded.

Once you were sure the drive belts were in place , allowing the engine to cool off at idle would be best.
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