Advice? ...overheating in Nacogdoches

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

Advice? ...overheating in Nacogdoches

September 05, 2020, 03:59:29 pm

so just picked up the coach... made it 20 miles from Nacogdoches before engine shutoff. I was fixated in my trans Temps, and did not notice my engine Temps shot up above 220.

They had just replaced the fan controller, and did a radiator flush... it seems to have coolent ( too hot to check). If I let the engine cool all the way, anyone think it's safe to drive it 13 miles back to the repair facility? It's that or call for a tow?

How hot is safe before I should pull over?

The fans are kicking on, these seems to be coolent...
They are closed for the weekend....

Re: Advice? ...overheating in Nacogdoches

Reply #1 – September 05, 2020, 04:18:28 pm

If coolant was changed, quite possible there is an air pocket. Once cool, check coolant level.

Re: Advice? ...overheating in Nacogdoches

Reply #2 – September 05, 2020, 05:00:47 pm

Do you have a coolant overflow recovery tank? If so, watch the level in that tank as the engine cools. If the level goes down, add enough coolant to keep the tank around half full. After several engine heating/cooling cycles the COLD level in the tank should stabilize. At that point, all the air has been displaced from the cooling system.

Photo of the tank on our coach below:

Re: Advice? ...overheating in Nacogdoches

Reply #3 – September 05, 2020, 05:13:20 pm

Yes. You can drive it until the temp starts above 200 then shut it down if you have not made it the 13 miles but you should be able to. Then, when cooled off, do it again.
I did that in Kansas.

Re: Advice? ...overheating in Nacogdoches

Reply #4 – September 05, 2020, 05:17:28 pm

MOT has after hours emergency tech support hotline. Says it's 8am-5pm on Saturday and Sunday. Might give them a call.
936-462-3996

Re: Advice? ...overheating in Nacogdoches

Reply #5 – September 05, 2020, 05:17:35 pm

Try their help line at MOT I think this is it (936) 462-3996

Tim Fiedler
Gen-Pro.biz
630 240-9139

Re: Advice? ...overheating in Nacogdoches

Reply #6 – September 05, 2020, 05:19:11 pm

But, if the coolant level in the cooling system is low, there will be air there, so the overflow reservoir will not function as it should-- the air in the system will absorb the expansion as the engine warms up.

So, at least for a couple of times after changing coolant, with the engine cold check by removing the radiator cap.

Let us know how much you are able to add.

Re: Advice? ...overheating in Nacogdoches

Reply #7 – September 05, 2020, 05:39:18 pm

Had my engine flushed this spring. Drove it home 35 miles and parked it. Temp stayed 190. Went to move it this week, 1 1/2 gallons low. I can't find any leaks. Has to be air pocket. Drove it for a few miles to the house. The coolant level is still full. Will check it again after the next few trips to make sure all the air is out.

Larry

Re: Advice? ...overheating in Nacogdoches

Reply #8 – September 05, 2020, 06:33:14 pm

I let it cool for a few hours, was able to add 1 container to the coolent tank. (Not the overflow) I made it back to the repair shop, left them a message... I was over 220f within 10 miles.. as I pulled in. At idle in neutral the temps kept rising. The fans were running, it has coolent... blockage, maybe the air bubble? Pump? I guess ill find out. The engine and turbo sound healthy and it had power...

Glad I could make it back to the shop. I put it in because after a 1200 mile trip it would get near 220 occasionally, while pulling toad up steep mountin grades. They said it needed a new fan controller... it's obviously much worse now.

The temps are much too high, too quick to make it back to dallas. I'm suspecting the coolent is not circulating, as the overflow was cold, despite the high temps

Re: Advice? ...overheating in Nacogdoches

Reply #9 – September 05, 2020, 06:42:14 pm

Hyd pump belt missing?

jk

Re: Advice? ...overheating in Nacogdoches

Reply #10 – September 05, 2020, 06:46:15 pm

Quote from: kimosabe99 – September 05, 2020, 06:42:14 pm

Hyd pump belt missing?

jk

Not if the fans are running.

As to whether they are running at the proper speed-- THAT is another question.

Check coolant level again in the morning (remove radiator cap).

Re: Advice? ...overheating in Nacogdoches

Reply #11 – September 05, 2020, 06:49:32 pm

I'm not very knowledgeable on the Cummings ISM 450, so take with a grain of salt... I only see 2 belts, both look snug. I think it's a gear driven pump.

Thanks for the help all. I'm inclined to lean on the repair shop, since they just tinkered with it. I'm leaving the coach in Nac. and heading back to Dallas.

My main concern was getting off the hwy, and not damaging the engine. I "think" I accomplished that. Ya'll are awesome helping me out on your holiday weekend. I'll let you know what I find out.

Re: Advice? ...overheating in Nacogdoches

Reply #12 – September 05, 2020, 06:56:08 pm

The 2 belts are for the alternator and the air conditioning. Water, fuel, air compressor and hyd pump are gear driven

Re: Advice? ...overheating in Nacogdoches

Reply #13 – September 05, 2020, 07:01:27 pm

The engine physically shut down? Versus a temp warning light? I have had mine over 220 on the dash gauge with no warnings many times.

VPMS said nearly 10 degrees less at the engines ECU btw at that high of temp.

Do you have a heat gun?

Re: Advice? ...overheating in Nacogdoches

Reply #14 – September 05, 2020, 07:15:32 pm

IMO, the fact that the gauge is now reading hotter is enough to make one want to determine WHY.

Said another way, whether gauge is accurate or not, the fact that it is now reading hotter is material.

Re: Advice? ...overheating in Nacogdoches

Reply #15 – September 05, 2020, 07:49:45 pm

Agreed, it is much hotter. MOT called me back btw... was extremely helpful, asked if I was stranded or needed help. He stated the ISM will shut down to protect itself, and he's thinking its a thermostat. I did not see warnings until my power steering cut. I was able to easily guide it of the road and break... I did not feel it created a dangerous situation... it was almost like it cut power for a time before shutting down. That's probably better than cracked heads and a warped turbo.

I'm extremely impressed with the customer service if MOT however. Had I known.

I have a scan gage, it stated WT is 202f at peak, while VDO stated 240ish... I don't know if the scan gage is referencing the same data point however....

Re: Advice? ...overheating in Nacogdoches

Reply #16 – September 05, 2020, 08:33:02 pm

Thermostat?

Re: Advice? ...overheating in Nacogdoches

Reply #17 – September 05, 2020, 09:06:08 pm

Cummins ISX Thermostat Housing - 4059212

That's what the MOT mechanic was suspecting.

Re: Advice? ...overheating in Nacogdoches

Reply #18 – September 05, 2020, 10:29:02 pm

Sounds like you have a low coolant sensor in the coolant tank? If low enough would it shut off the power. 202 surely would not do it as far as I know?

Re: Advice? ...overheating in Nacogdoches

Reply #19 – September 05, 2020, 11:59:12 pm

Low coolant sensor failure will allow engine to run 30 seconds then shuts down. Can repeat start and thirty second run cycle. Allows operator to remove from road.
Scott

Re: Advice? ...overheating in Nacogdoches

Reply #20 – September 06, 2020, 06:43:47 am

There should have been an alarm prior to shutting down. If there wasn't, find out why.

You won't regret investing in a Silverleaf or whatever that other system that some are using because you can watch the temps so much more closely than with the gauges.

There are so many things to get used to on a coach. I'm sorry you're having this trouble right off the bat. It's probably something simple. Don't get discouraged.

Re: Advice? ...overheating in Nacogdoches

Reply #21 – September 06, 2020, 06:57:47 am

Was the thermostat replaced with the engine flush?

Re: Advice? ...overheating in Nacogdoches

Reply #22 – September 06, 2020, 08:52:02 am

Quote from: ITguy – September 05, 2020, 06:33:14 pm

The temps are much too high, too quick to make it back to dallas. I'm suspecting the coolent is not circulating, as the overflow was cold, despite the high temps

I would think that overheating due to loss of coolant circulation would either require both of the dual thermostats to be stuck closed or plugged up with something, OR the coolant filter to be plugged up with junk knocked loose by the flushing procedure.

Did they change the coolant filter after the radiator flush?

Will the coolant filter automatically bypass if it gets plugged up? I don't know...

Re: Advice? ...overheating in Nacogdoches

Reply #23 – September 06, 2020, 09:31:10 am

Quote from: Chuck & Jeannie – September 06, 2020, 08:52:02 am

I would think that overheating due to loss of coolant circulation would either require both of the dual thermostats to be stuck closed or plugged up with something, OR the coolant filter to be plugged up with junk knocked loose by the flushing procedure.

Did they change the coolant filter after the radiator flush?

Will the coolant filter automatically bypass if it gets plugged up? I don't know...

The water filter is a bypass filter, you could plug it off and the cooling system would still work fine except for removal of contaminants.

Re: Advice? ...overheating in Nacogdoches

Reply #24 – September 06, 2020, 09:48:29 am

There is also a valve on the coolant filter to shut off flow during filter change. Wasn't there something about returning to the full open position after filter change. Don't recall if it bypassed in closed position.
Scott

Affiliate Notice