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

Re: Advice? ...overheating in Nacogdoches

Reply #50 –
Quote from: Pierce & Gaylie Stewart –
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.

Charlie and Jennifer Sawyer, et. al.
2000 U320 M-4010 #5625
2015 Rubicon

Re: Advice? ...overheating in Nacogdoches

Reply #51 –
Excuse the dust, we had hail damage, so went straight to the repair facility...
Charlie and Jennifer Sawyer, et. al.
2000 U320 M-4010 #5625
2015 Rubicon

Re: Advice? ...overheating in Nacogdoches

Reply #52 –

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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Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Advice? ...overheating in Nacogdoches

Reply #53 –
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
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Advice? ...overheating in Nacogdoches

Reply #54 –
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!



Charlie and Jennifer Sawyer, et. al.
2000 U320 M-4010 #5625
2015 Rubicon

Re: Advice? ...overheating in Nacogdoches

Reply #55 –
Thanks for coming back and explaining the problem. Could help someone else down the road.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean