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Old 07-20-2015, 09:18 PM   #1
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Possible Coolant Issue

Based on some recommendations from this forum I decided to have my fluids tested by a certified lab, (JG Lubricant Services). Oil sample came back in great shape but the coolant sample did not.

The test result indicated a glycol level of 42%, JG Lubricant Services parameters recommend a glycol level in the range of 45 to 62%.

Eleven months ago Fleetguard ES Compleat premix was added after a drain and flush which should be good for six years.

I have sent an inquiry to Cummins PowerMaster to see if the glycol mix of 42% is their standard or?

Anyone out there run into this problem? At this point I'm not sure if I even have a problem.
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Old 07-20-2015, 09:48 PM   #2
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When I did my drain and flush, I had to calculate how much water was left in the system and add that much concentrated coolant before filling with 50/50 mix. Maybe the folks that did yours did it differently, or just filled er up with 50/50. You could probably figure out how much to drain out and refill with concentrate to bring the mix up to what you want. You may even be able to get a chart from one of the coolant mfg.
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Old 07-20-2015, 09:59 PM   #3
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I think RMCO is right on point with his response.

It's common practice for the tech to just add the premix to the system after a drain and not do a check afterwards.

I've not found this to be a big issue in practice and my experience, but you may still want to do the enquiring you mentioned in you post for if nothing else but your peace of mind.
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Old 07-20-2015, 10:00 PM   #4
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Yep, there was either the flushing plain water of old coolant left in the system. There are several posts that detail how to do it correctly. To fix what you have correctly will require a drain, flush and correctly refilling the system.
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Old 07-21-2015, 06:30 AM   #5
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The easy way would be to do a partial drain, like a gallon out and replace it with 100% antifreeze.

Then run it to get the solution fully circulated and mixed, and do another check using a hydrometer first.

You lose less coolant this way and therefore less costly. The fluid you take out will not have to be disposed of as you can still adjust the mixture to proper proportions and keep it for refill next time. Also you will need to top off again after you've put some miles on the coach and all the air has left the engine block, if it hasn't already done so.
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Old 07-21-2015, 08:22 AM   #6
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Well guys it seems pretty obvious what happened. Have no idea why I didn't think of it. Thanks for the input. It'll be an easy fix.
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