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Topic: Advice? ...overheating in Nacogdoches  (Read 2894 times) previous topic - next topic

Re: Advice? ...overheating in Nacogdoches

Reply #40 –
 If this came on suddenly,post service. I would also check the T stats. and overall for air pockets.
 Getting hot  in that short amount of time is a symptom of a stuck T stat.  Having the radiator with  hot and cool  spots is also  a sign of poor coolant flow.,not poor fan air flow. 
 Good chance they are covering their but and trying to make a little more while they fix the T stat . IMHO.

Re: Advice? ...overheating in Nacogdoches

Reply #41 –
So picked up the coach from Nac, made it to Mt. Enterprise and had a thermal shutdown.. this is fun.... engine fluids light this time... but there is coolent...

Letting it cool down and taking her back.

Re: Advice? ...overheating in Nacogdoches

Reply #42 –
Not good. Was curious how they ts Hydraulic pump issue Scott

Re: Advice? ...overheating in Nacogdoches

Reply #43 –
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

Re: Advice? ...overheating in Nacogdoches

Reply #44 –
Mt Enterprise is less than 22 miles from Nacogdoches. With judicious stopping/cooling down, one drive that with NO cooling fan.

Re: Advice? ...overheating in Nacogdoches

Reply #45 –
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
Pump is gear driven, no belt on ISM
Scott

Re: Advice? ...overheating in Nacogdoches

Reply #46 –
There is a major cold front coming across Texas. Air Temps will drop with high winds expected (gusts 45).

I just looked. Just west of Dallas currently.

Re: Advice? ...overheating in Nacogdoches

Reply #47 –
How about products of combustion in the cooling system? Did they check that?

And our coach won't make 2 miles when the belt breaks for the fans.

Pierce

Re: Advice? ...overheating in Nacogdoches

Reply #48 –
 If the belts were changed , there is a remote chance that one set was installed so that something runs backwards . Maybe the water pump?  It happens on cars  , not often but the serpentine belts can be confusing if you dont take a pic or have a map of the routing . 

Re: Advice? ...overheating in Nacogdoches

Reply #49 –
Quote from: Protech Racing –
If the belts were changed , there is a remote chance that one set was installed so that something runs backwards . Maybe the water pump?  It happens on cars  , not often but the serpentine belts can be confusing if you dont take a pic or have a map of the routing . 
It's like a Detroit 2 cycle, it's internally driven so no belts. That is what I originally thought.

Pierce

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.

Re: Advice? ...overheating in Nacogdoches

Reply #51 –
Excuse the dust, we had hail damage, so went straight to the repair facility...

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

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.

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

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!



Re: Advice? ...overheating in Nacogdoches

Reply #55 –
Thanks for coming back and explaining the problem. Could help someone else down the road.