I think I'm losing a little coolant. maybe 6 ounces in a 1000 miles. So what are the possibilities?

Radiator.. No coolant on floor and no signs of leaks at rad or hoses.

egr cooler.. No signs of coolant in oil, last OA was normal, dip stick looks water free.

Pin hole in water pump... No water in oil, nitrates are fine, checked last night. Coolant has never been below "cold full" line.

HG failure, no white exhaust, no water in oil. No coolant oder.

Is it just using coolant at a level where I'm not gonna be able to detect the problem until it gets worse? What am I missing? Hate to pay for a pressure check if it's not gonna tell me anything. I'm open for suggestions.

 

With all the leaks I have had rarely was there any evidence of it, think it evaporates when he engine is hot and then doesn't leak when it is off. First one I smelled long before there were any puddles, that was the EGR when that happened. Should be able to take it in, tell them it is eating some and they will pressure test it under warranty.

 

I had coolant disappearing and took it in.

Turned out to be the rad hose at the engine, so it leaked and evaporated on the hot engine.

I was very confused also, no drips, no white exhaust, etc.

 

I'd check those radiator hoses at the engine side of the connection.

You need to shine a flashlight around the connections and look for white splatter.

 

After my hose experience I'd want pictures and want to come physically see the leak before they pull the hoses if that does happen to be the problem.

 

Is it yours where they forgot to top off the coolant and you ended up with a lot of expense?

 

You couldn't smell it?

 

I'm out of warranty unless the T-stats are bad (I think), and I won't know that until after the test. Anybody with a pressure pump can do the teat right? It either holds or it doesn't. The trick is figuring out why it's not holding. Isn't that how it works?

 

OK, I'll give that a closer look in the morning. Don't you think I should be smelling it if there is an external leak?

 

Ditto on Parkland's experience. I couldn't find any signs or smells of a leak before the fix. The coolant level stays exactly the same now after the hose replacement.

 

I have a really slow loss of coolant too; first time at dealer they pressure test and found nothing. Second time they tell me it is my radiator; I had looked it over myself top to bottom, etc and never seen any evidence of a leak. I declined replacement as said out of warranty; but on way home I get reduced power, etc. from the new flash at same service. Short story, the code is for hyper extended thermostats; which made the radiator under warranty.

Well I still have the same slow leak. I also have no signs of coolant in oil analysis but I have elevated potassium which can be an indication of coolant; typically after it has evaporated in the EGR flow. So maybe I have a leaking EGR valve (mine has coolant lines) or worse a leaking EGR cooler(s)?

I also have black exhaust tips. Probably cracked.

I take pictures of my degas bottle and odometer ever so often to document the level. I will try to get this resolved at dealer again; but, if I don't get to bottom of real issue then I will get rid of my truck. Metal wear on oil analysis is also too high.

My coolant loss is greater when towing heavy.

So how are your potassium levels in your oil analysis?
Do you have the EGR valve with coolant lines?

Check out this you tube video, note at 1:35 play time.....
6.4 Liter Ford Powerstroke - Coolant Leaks Points - Radiator Removal - YouTube

mine is not this bad but there is some residue under the sensor

Bob

 

No, mine had the cab off twice in about 15 months and then the hoses mysteriously started leaking conveniently in the middle, not at the O rings, and therefore were not covered under warranty. Nor was removing the cab twice in that period detrimental at all to the hose life according to the dealer.

My fault for not asking for the old parts and not making sure where the leak was when they found it, complaining after the fact turned out to be pointless, although I learned what dealer not to deal with again.

 

Had one check with high potassium, but that was 18 months ago. Last two reports have been good, 3 and 4 units. Unsure of what you mean by EGR coolant lines. My trucks a job one so if it's a bad thing I probably have them. All I see is a vertical and a horizontal cooler that looks like it was made in a high school shop class. I'll look for lines later today. If the EGR is leaking that would be internal right, I would not see any evidence of it except white exhaust and the loss of coolant, right?

 

Ouch, I'm sure that wasn't cheap. I don't go to the dealer much but I've had a 10 year relationship with mine and it's always been satisfactory. They have a seperate truck lot and sell a lot of trucks and I think that helps.

 

When my upper radiator hose leaked I did not smell coolant. I discovered it at a fuel stop when I popped the hood. Even hot the level was not where I usually see it. It was down to the min level line. That was when I started searching for the leak. Took me a few days to figure out it was the upper hose.