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Old 08-25-2014, 02:57 PM   #1
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ECU coolant

I posted this in the Cat section, but got no love. So I thought I would try here...
We just got back from a 3200 mile trip. All went well, but a couple of times when I first started up in the morning, I would get a check engine light and the screen would say ECU coolant low (or something along those lines). If I shut it off and restarted, or just let it run for a minute, it would go away. Engine ran great the while trip. It only happened occasionally, and only in the mornings.

Do I have an issue? Is there something I should check? Or could this be one of those RV gremlins that show up on occasion?

I'm sure I haven't given enough info, so fire away with your questions.
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Old 08-25-2014, 03:51 PM   #2
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Hi jeffwit,
I do not know your coach. However, the low coolant sensor us usually located in the expansion tank. The coolant may actually be low! If the coolant level is the same as the sensor level, you will get the symptom mentioned in the OP.

If the expansion tank is one where you cannot see into it, consider getting a coat hanger (metal) or anything ridged and stick it into the tank. When you withdraw the stick, you'll be able to determine the coolant level, when cold. I use a 16' measuring tape. The sensor in my tank is 6" below the cap. I make sure the coolant level (cold) is 5" below the cap.
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Old 08-25-2014, 07:36 PM   #3
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Sorry for my ignorance, but where would I find said coolant tank?
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Old 08-25-2014, 07:47 PM   #4
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Side rad or rear rad ?
Side rad the , expansion tank is across the engine compartment opening, maybe see through or metal and require the checking , Gary , described.
Rear rad , the tank can be across the top of the rad , or vertical down one side, same applies , can be plastic or metal.
If you need more info , re-post and I'll take a picture of mine in the morning.
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Old 08-26-2014, 08:47 AM   #5
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Rear rad. And is the coolant in question here just for the radiator? I just had a chassis service done. Wouldn't checking the level be a normal part of that?
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Old 08-26-2014, 08:57 AM   #6
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Quote:
Originally Posted by jeffwit View Post
Rear rad. And is the coolant in question here just for the radiator? I just had a chassis service done. Wouldn't checking the level be a normal part of that?
The coolant in your coolant recovery tank is just for cooling your engine. So, yes that is what is in the radiator, your coolant hoses, the heater core and what circulates through your motor aide in your water heater.

Checking coolant level would depend on the shop you used, what you asked them to do, what they normally do. It has been my experience that most places, other than the Freightliner Custom Chassis service center in Gaffney, SC, do just what you ask them to do. Did you ask them to check the coolant level and test it with a strip or refractometer? What was on the invoice?

If your's is the original coolant, you are past due for changing it, IMO. If so, this would be a good time to do a drain, flush and refill with new OAT coolant. Also, CAT usually recommends replacing the thermostats so I would have that done at the same time.
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Old 08-26-2014, 09:07 AM   #7
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Originally Posted by smlranger View Post
The coolant in your coolant recovery tank is just for cooling your engine. So, yes that is what is in the radiator, your coolant hoses, the heater core and what circulates through your motor aide in your water heater.

Checking coolant level would depend on the shop you used, what you asked them to do, what they normally do. It has been my experience that most places, other than the Freightliner Custom Chassis service center in Gaffney, SC, do just what you ask them to do. Did you ask them to check the coolant level and test it with a strip or refractometer? What was on the invoice?

If your's is the original coolant, you are past due for changing it, IMO. If so, this would be a good time to do a drain, flush and refill with new OAT coolant. Also, CAT usually recommends replacing the thermostats so I would have that done at the same time.
Ok. Thanks. I'll check with the shop. As far as I know, the coolant is still original. I've had the coach 2 years, and I know I've never had it changed.
Sounds like an opportunity to get some grease on my hands.
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Old 08-26-2014, 09:13 AM   #8
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Check your hose clamps going and coming from your transmission cooler...I had a similar problem and was able to get several turns on them tightening them up. Your coolant recovery tank is most likely low so you will need to locate and add fluid to the "cool" mark on the tank. They are normally made of plastic and somewhat transparent...some where up above your radiator...I have a picture of my transmission cooler and clamps attached...mine is a Cummins engine with Alison 3000 transmission...Click image for larger version

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