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Old 10-12-2015, 01:12 PM   #1
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Lost My Engine Coolant!

About two weeks ago I drove my coach (120 mi round trip) to have some new tires installed. Everything looked good before I left home. Yesterday, I tried to winterize it and noticed that my surge tank was empty - nothing showing on the side gauge. I had two gallons of concentrate antifreeze. Added that plus two gallons of distilled water, but I still don't see anything on the gauge. As I was driving home, it was running fine no fault codes or warnings, no visible signs of any leaks that I can see on the floor of my garage or the driveway. Of course I didn't let it run for more than a couple of minutes. I can't get the Fleetguard antifreeze (ES Compleat EG) locally. I will fill up my surge tank and let it run for a while and see where the leak is. It has got me really worried!
Any thoughts or suggestions?
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Old 10-12-2015, 01:21 PM   #2
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Originally Posted by srh View Post
About two weeks ago I drove my coach (120 mi round trip) to have some new tires installed. Everything looked good before I left home. Yesterday, I tried to winterize it and noticed that my surge tank was empty - nothing showing on the side gauge. I had two gallons of concentrate antifreeze. Added that plus two gallons of distilled water, but I still don't see anything on the gauge. As I was driving home, it was running fine no fault codes or warnings, no visible signs of any leaks that I can see on the floor of my garage or the driveway. Of course I didn't let it run for more than a couple of minutes. I can't get the Fleetguard antifreeze (ES Compleat EG) locally. I will fill up my surge tank and let it run for a while and see where the leak is. It has got me really worried!

Any thoughts or suggestions?

Check your oil & transmission fluid for signs of coolant. If your EGR valve fails, coolant can get into combustion chamber.


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Old 10-12-2015, 01:30 PM   #3
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Suggest you look up under the front of your coach for a coolant leak at the heater core.....not unheard of for the clamps up there to loosen up a bit over time or for the coolant line(s) to split. You may see signs of wetness or coolant "tracks" in the area. Since the core, lines, etc., are under the dash area, you may have to remove a panel or two to be sure. Over time, even a small dribble or leak up there unnoticed could cause coolant loss such as yours. Of course, it the coolant shut off valves (2) are closed back at the engine, then coolant is not flowing to the front. It's worth taking a look....

Please let us know what you find out.....thanks!
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Old 10-12-2015, 01:35 PM   #4
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Check your oil & transmission fluid for signs of coolant. If your EGR valve fails, coolant can get into combustion chamber.


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Steve: I checked the oil the level is OK, but cant' tell of any contamination. I just ordered some fluid analysis kits to check both. I haven't looked at transmission fluid as i do not want to start it until I have the surge tank filled.
Thanks for your suggestion.
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Old 10-12-2015, 01:39 PM   #5
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Steve: I checked the oil the level is OK, but cant' tell of any contamination. I just ordered some fluid analysis kits to check both. I haven't looked at transmission fluid as i do not want to start it until I have the surge tank filled.
Thanks for your suggestion.

You might want to check the three small hoses that attach to the back of the surge tank. Those have been known to fail.
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Old 10-12-2015, 01:40 PM   #6
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Worst case scenario. Blow head gasket and coolant blowing out the exhaust as steam. I sure hope not.
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Old 10-12-2015, 01:42 PM   #7
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Suggest you look up under the front of your coach for a coolant leak at the heater core.....not unheard of for the clamps up there to loosen up a bit over time or for the coolant line(s) to split. You may see signs of wetness or coolant "tracks" in the area. Since the core, lines, etc., are under the dash area, you may have to remove a panel or two to be sure. Over time, even a small dribble or leak up there unnoticed could cause coolant loss such as yours. Of course, it the coolant shut off valves (2) are closed back at the engine, then coolant is not flowing to the front. It's worth taking a look....

Please let us know what you find out.....thanks!
Good point! I'll do that. I think the heater was on, I'll double check on that as well. I noticed some wetness on the 3/4" hose going into the radiator and tightened it. I'm hoping that was the problem! Thanks for your suggestions.
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Old 10-12-2015, 01:45 PM   #8
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Worst case scenario. Blow head gasket and coolant blowing out the exhaust as steam. I sure hope not.
Shouldn't have I noticed that? Or, show up on my SilverLeaf?
Thanks,
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Old 10-12-2015, 01:48 PM   #9
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You might want to check the three small hoses that attach to the back of the surge tank. Those have been known to fail.
After I noticed the wetness on one of the hoses that go to the radiator, I tightened all the three. They did need some tightening, but didn't seem to be leaking like the one to the radiator.
Thanks,
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Old 10-12-2015, 01:49 PM   #10
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I don't have Silverleaf so I don't know what it would show. If it is a small gasket leak it could just be injecting/ejecting a small amount of coolant and no power loss. Just a bit of vapor at the exhaust.
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Old 10-12-2015, 01:55 PM   #11
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Hope it was the 3/4" hose, as under pressure and driving, you could have loss enough coolant to drain the reservoir. On our older 04 Allure, their are two pumps in the loop from the engine to the front of the coach Over The Road heater. The rear one is famous for failure due to engine heat over the years. We went ahead and had our's bypassed, as even Country Coach will now say that only one pump was needed, with the rear being overkill. (Of course, may not apply to your year and higher (top) of the food chain model!

And I do not believe Silverleaf would have anyway of knowing if you had blown head gasket that was leaning coolant into the exhaust system. Only when the coolant was too low, would it trigger you.

And for the amount you probably loss, 3-5 gallons by the sound of it, as you still do not see the coolant after topping off, you may not have contaminated the oil enough to turn it the milky color of coolant in oil. You have lots of oil in that engine.

Hoping it is something easy, and maybe even fixed now with the tightening of the 3/4" hose.

Please let us know what you determine was root cause, and best of luck,
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Old 10-12-2015, 02:03 PM   #12
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Hope it was the 3/4" hose, as under pressure and driving, you could have loss enough coolant to drain the reservoir. On our older 04 Allure, their are two pumps in the loop from the engine to the front of the coach Over The Road heater. The rear one is famous for failure due to engine heat over the years. We went ahead and had our's bypassed, as even Country Coach will now say that only one pump was needed, with the rear being overkill. (Of course, may not apply to your year and higher (top) of the food chain model!

And I do not believe Silverleaf would have anyway of knowing if you had blown head gasket that was leaning coolant into the exhaust system. Only when the coolant was too low, would it trigger you.

And for the amount you probably loss, 3-5 gallons by the sound of it, as you still do not see the coolant after topping off, you may not have contaminated the oil enough to turn it the milky color of coolant in oil. You have lots of oil in that engine.

Hoping it is something easy, and maybe even fixed now with the tightening of the 3/4" hose.

Please let us know what you determine was root cause, and best of luck,
Smitty
Smitty: Thanks for chiming in! I just checked the capacity of the surge tank and it is 6.15 gallons. I have already put in 4 gallons and placed a wire inside the tank and it looks like it is just below the gauge.
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Old 10-12-2015, 02:24 PM   #13
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Smitty: Another question for you that is I have OTR AC. That is not the same as OTR heater, is it?
Thanks
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Old 10-12-2015, 11:41 PM   #14
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I got a coolant leak and caught it right after a return home. It turned out to be a failed circulation pump. The pump was located over the driveshaft up high. I replaced the pump but some have bypassed. I suspect your pump is in the same location since our machines are the same year.
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