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Old 04-16-2018, 06:17 PM   #1
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Lost 3 gallons of antifreeze, but no leaks found?

Was driving from Sedona AZ to Albuquerque to Amarillo NM, and then on to Dallas TX today. Sedona, checked all fluids and I don't always check at each stop because all has been so reliable. I might glance under before heading out, no drips, no runs, no errors. Was leaving Amarillo this morning and notice a lot of something all over the back of the coach, and looked at my toad (which I hadn't unhooked over night) and it also had some stuff on the windshield. Popped open the back and the antifreeze was not visible in the surge tank!! Had no temperature issues yesterday. A Cummins dealer was right near, went and bought 3 gallons and filled the surge tank half way up. Started it and let it warm up...same level. Drove 318 miles, stopping every 70-80 to check the level, arrived in Dallas and not a tiny bit down??? Looked all around the engine and radiator, no leaks of any sort could be found. Nothing in the oil either. Vent tube for the surge tank looks wet on the tip.

The regeneration system (hot exaust light) kicked on between Sedona and ABQ for about 15-20 minutes while driving...would that cause anything like this to happen??

Cummins ISL 425 hp
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Old 04-16-2018, 06:32 PM   #2
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Re-gen should have nothing to do with coolant loss.
But don't forget , you have heater hoses running the length of the frame rails to the dash , coolant can be getting into your water tank bay, basement or dripping out of the heater core at the fire wall .
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Old 04-16-2018, 09:22 PM   #3
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On my Intrigue, the Hurricane heater was leaking coolant out the automatic air vent. I donít know if you have a similar system.

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Old 04-16-2018, 10:31 PM   #4
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I lost over a gallon of coolant and come to find out I had a bad radiator cap. The rubber on the cap was missing just a little bit on the edge. Installed a new one and fixed the problem.
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Old 04-17-2018, 08:13 AM   #5
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When you stated that you found "something" on the rear of the coach and tow vehicle, you brought up memories of my experience with antifreeze/coolant loss. I had to search a fluid "escape" as well. The hose connection to my heat exchange water heater, that's a source of hot fluid going through the water tank, was loose. The floor of the compartment was covered with anti-freeze/coolant. So much so that it started leaking through the flooring and out to the wheel well, spraying the fluid all over the rear of the coach and tow vehicle... This all happened last summer and I quickly tracked it down and repaired. Now it's something I check during any travel. Hope you find the source...
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Old 04-17-2018, 10:50 AM   #6
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Since your problem did not reoccur 2Stroker is on the right path. Before leaving on your trip you probably checked your overflow tank and didn't fully close your radiator cap. As your engine heated up you lost coolant. After you added coolant you were probably a little more cautious replacing your cap. Mystery solved.
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Old 04-17-2018, 01:05 PM   #7
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My surge tank cap (radiator cap looking part) was very bad...I think that was it!! WHEW! Thank you all!!!!!
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Old 05-06-2018, 08:50 AM   #8
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Coolant level

I have a 2006 Inspire 360 Genoa. with a C9 Cat There is a square steel coolant reservoir in back on left side as I face the front of the RV that holds a few gallons of coolant. It has a sight glass and a mark about 1/2 way up the tank. Should the coolant be at that mark when cold or hot? I have been keeping it at the mark when cold. When the coolant is hot the level is about 1 1/2 to 2 inches higher. Radiator cap is 16 lb. and new.

The reason for the question is sometimes when I stop after a few hours of driving, I see a few drops of coolant has dripped from the over flow hose onto the rear of the mud flap. I cannot see any difference in the coolant level. No oil in water or water in oil.

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Old 05-06-2018, 11:10 AM   #9
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Quote:
Originally Posted by Tom Gordon View Post
I have a 2006 Inspire 360 Genoa. with a C9 Cat There is a square steel coolant reservoir in back on left side as I face the front of the RV that holds a few gallons of coolant. It has a sight glass and a mark about 1/2 way up the tank. Should the coolant be at that mark when cold or hot? I have been keeping it at the mark when cold. When the coolant is hot the level is about 1 1/2 to 2 inches higher. Radiator cap is 16 lb. and new.

The reason for the question is sometimes when I stop after a few hours of driving, I see a few drops of coolant has dripped from the over flow hose onto the rear of the mud flap. I cannot see any difference in the coolant level. No oil in water or water in oil.

Regards,

Tom
I keep my leval at the sight glass when cold. From the coolant reservoir there is a hose going to a overflow reservoir.... https://www.napaonline.com/en/p/NDP6053400

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Old 05-06-2018, 11:15 AM   #10
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Quote:
Originally Posted by 2 Stroker View Post
I lost over a gallon of coolant and come to find out I had a bad radiator cap. The rubber on the cap was missing just a little bit on the edge. Installed a new one and fixed the problem.
2 stroker
I agree, a Radiator cap is a likely source for this problem. Most automotive parts stores can test the cap for you to the pressure rating stamped on the cap. I have gone through 3 new, out of the box, caps before I got one that held rated pressure.
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Old 05-06-2018, 01:33 PM   #11
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Coolant

Thanks for your response. Where on the site glass do you keep the level? The mark on my coolant reservoir is about 1/2 way up the site glass. Also, did you install the overflow reservoir as all I have is the coolant reservoir? I could install an overflow reservoir as there is plenty of room.


Quote:
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I keep my leval at the sight glass when cold. From the coolant reservoir there is a hose going to a overflow reservoir.... https://www.napaonline.com/en/p/NDP6053400

Bill
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Old 05-06-2018, 02:08 PM   #12
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Quote:
Originally Posted by Tom Gordon View Post
Thanks for your response. Where on the site glass do you keep the level? The mark on my coolant reservoir is about 1/2 way up the site glass. Also, did you install the overflow reservoir as all I have is the coolant reservoir? I could install an overflow reservoir as there is plenty of room.
One way builders reduce costs is to eliminate the overflow tank. Will it work without it? Yes. Is it better to have it? Yes.

The overpressure connection that is above the rad cap seal has a hose attached to direct overflow coolant from the cap to the ground.
By connecting this hose to the bottom of an overflow tank the coolant is captured in the overflow. In addition, by having a minimum level in the overflow when cold, as the temperature increases, the expanded coolant flows into the bottom of the tank. Any entrained air in the system is also forced into the overflow. Now, when the engine is shutdown and cools, the coolant from the overflow can flow back into the cooling system but the air does not due to the level in the overflow.
By monitoring the minimum level in the overflow, you are assured of a full level in the cooling system and, most important, no entrained air which is one of the main causes of cylinder liner pitting and cooling system component failures.
So, is it worth the trouble and expense to add a coolant overflow? Absolutely.
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Old 05-06-2018, 02:15 PM   #13
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Over Flow reservoir

Thanks. What you posted make perfect sense. I am going to install an over flow reservoir and fill it with approx. a quart of antifreeze while cold which will ensure no air is pulled back into the coolant reservoir.

Regards,

Tom
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Old 05-06-2018, 10:06 PM   #14
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Quote:
Originally Posted by Tom Gordon View Post
Thanks for your response. Where on the site glass do you keep the level? The mark on my coolant reservoir is about 1/2 way up the site glass. Also, did you install the overflow reservoir as all I have is the coolant reservoir? I could install an overflow reservoir as there is plenty of room.
Tom, my sight glass is at about the half way leval of the tank. I keep the coolant at that leval when cold. The overflow reservoir was on the coach when I purchased it. I agree with dennis45, itís worthwhile to have one.

Bill
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