Advice? ...overheating in Nacogdoches

Topic: Advice? ...overheating in Nacogdoches (Read 2552 times) previous topic - next topic

Re: Advice? ...overheating in Nacogdoches

Reply #50 – September 30, 2020, 07:36:45 pm

Quote from: Pierce & Gaylie Stewart – September 27, 2020, 07:32:14 pm

How many miles is Mr. Enterprise from Nac? Are your fans working? High speed fans? Outside temp? Does it run cooler at lower speeds? Will it cool down at idle? Assuming the pump belt tight and tensioner working OK. Transmission temp OK?

Pierce

Fans appear to be working... I noticed it hit operating temp and then just kept climbing. Down shifted, ran high RPM, which cooled me down in the SD mountains, no affect. Pulled over an idled, lowered temp to around 209f from 220... Turned around to head back, it climbed to 230ish and shut down. I did get an engine coolant light flash this time, but the system had no leaks and was full of coolent... I pulled over and let it set for about an hour.... It stayed a cool 180f all the way back... Strangest thing. I left with FT because I did not have confidence I could make it back to Dallas.

Have not heard back from them yet, will call tomorrow.

I think the fan controller, which was replaced has a high/low mode, maybe it did not kick into high? If this was a Chevy I'd replace the thermostat. High temps, plenty of coolant, fans running....
1. Still has air in the system?
2. Fan's spinning but not fast enough, or high mode did not kick in?
3. blockage in the coolant system?
4. Thermostat? Did not spring under high temps, after shutdown heat soak maybe took it over 240, the thermostat popped finally and now it's cooling?

Not familiar enough with the ISM yet... mystery to me.

Re: Advice? ...overheating in Nacogdoches

Reply #51 – September 30, 2020, 07:46:16 pm

Excuse the dust, we had hail damage, so went straight to the repair facility...

Re: Advice? ...overheating in Nacogdoches

Reply #52 – September 30, 2020, 08:02:03 pm

Even low speed on the fans should cool it down at idle and slow speeds.

Was the transmission temperature normal?

Thermostat sticking would be a suspect. Possible air in system. I'm not familiar with any air bleed at the highest point in the Cummins coolin- system. Some cars have them.

Other possibility would be a leaking head gasket or failed wet sleeve seal/O-ring. A products of ccmbustion checker can quickly detect any in the cooling system. Any diesel shop should be able to test the coolant. Amazon.com: Block Tester BT-700 Combustion Leak Test Kit in Hard Case - Made...

Shop should be able to shoot cooling system/radiator with IR gun.

Smart not to go on to Dallas.

Pierce

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Re: Advice? ...overheating in Nacogdoches

Reply #53 – September 30, 2020, 08:05:31 pm

Just looked at your last photo. Is that the normal transmission temperature with the temp below 150? Might pull the tranny dip stick and check color and smell.

What does your engine oil look like? Dark black would be usual. Grey would indicate coolant in the oil.

Pierce

Re: Advice? ...overheating in Nacogdoches

Reply #54 – October 12, 2021, 10:15:04 am

I wanted to close the loop, we finally solved the overheat issue.
We had a series of component failures, which made this difficult to troubleshoot:
One of the first things tested was the hydraulic fans which tested good.
So then fan controller was replaced, and later the hydraulic pump.

We decided that the primary Hydraulic Fan failed after these repairs, which is why the issue became inconsistent, as it was hit or miss that it would hit the higher RPM speeds needed for second stage cooling.

The part sat on a container ship for many months do to the current state of shipping you can see on the news, which is why it's taken so long... but I'm happy to say I drove it from Nac to Dallas and it was rock solid.

I want to think Alan, James and the others at Foretravel that stayed with the issue. They don't have to service 20 year old coaches, so I can't say enough how thankful I am for their tenacity.

We had tile and a new Microwave put in while we were at it. Can't wait for the next trip!

Re: Advice? ...overheating in Nacogdoches

Reply #55 – October 12, 2021, 10:29:17 am

Thanks for coming back and explaining the problem. Could help someone else down the road.

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Re: Advice? ...overheating in Nacogdoches

Reply #50 – September 30, 2020, 07:36:45 pm

Re: Advice? ...overheating in Nacogdoches

Reply #51 – September 30, 2020, 07:46:16 pm

Re: Advice? ...overheating in Nacogdoches

Reply #52 – September 30, 2020, 08:02:03 pm

Re: Advice? ...overheating in Nacogdoches

Reply #53 – September 30, 2020, 08:05:31 pm

Re: Advice? ...overheating in Nacogdoches

Reply #54 – October 12, 2021, 10:15:04 am

Re: Advice? ...overheating in Nacogdoches

Reply #55 – October 12, 2021, 10:29:17 am

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