C15 leaking antifreeze

mattc14 · 10-04-2011, 05:38 PM

I have a C15 engine that suddenly started leaking antifreeze from the vent tube under the bottom of the engine. Found out the air compressor was bad so I changed that. That solved the problem of water pouring but I still have a very small leak of antifreeze from the vent tube. There is no oil in water or water in the oil. The truck runs fine. I thought maybe a cracked liner, but wouldn't that cause water in oil or oil in the water? No white smoke from the exhausts either. So, what else could it be? Thanks

Johnp3 · 10-04-2011, 08:46 PM

Even when you change the oil, you still get a lot of water sitting in the cavities. The water is heavier than the oil so the coolant sits there until it gets hot then comes out the vent. It will take at least a week of work, to get it out.
If you think you have a coolant leak, Wash off the motor as clean as you can, get the back end of it, Test the Rad cap, then do a bottle test. Do the test on clean concrete, and let it cool in the same space. That way if there is any external leaks you should be able to see them. Just a thought!

mattc14 · 10-04-2011, 11:38 PM

I changed the oil and there was no water in the oil.
Can you tell me how to do a bottle test? Thanks again.

Johnp3 · 10-05-2011, 03:51 PM

If you are getting steam and the vent is sweating there is coolant in the oil, if there is foam looking stuff on the oil filler cap, you have water in it.
If you search handy links it gives a full write up.

mattc14 · 10-05-2011, 04:00 PM

Quote:

Originally Posted by Johnp3

If you are getting steam and the vent is sweating there is coolant in the oil, if there is foam looking stuff on the oil filler cap, you have water in it.
If you search handy links it gives a full write up.

Ok. Thanks.

10-04-2011, 05:38 PM	#1
mattc14 Junior Member Join Date: Oct 2011 Posts: 3 Points: 282 Thanks: 0 Thanked 0 Times in 0 Posts	C15 leaking antifreeze I have a C15 engine that suddenly started leaking antifreeze from the vent tube under the bottom of the engine. Found out the air compressor was bad so I changed that. That solved the problem of water pouring but I still have a very small leak of antifreeze from the vent tube. There is no oil in water or water in the oil. The truck runs fine. I thought maybe a cracked liner, but wouldn't that cause water in oil or oil in the water? No white smoke from the exhausts either. So, what else could it be? Thanks

10-04-2011, 08:46 PM	#2
Johnp3 Junior Member Join Date: Nov 2009 Posts: 2,919 Points: 32,500 Thanks: 45 Thanked 430 Times in 396 Posts	Even when you change the oil, you still get a lot of water sitting in the cavities. The water is heavier than the oil so the coolant sits there until it gets hot then comes out the vent. It will take at least a week of work, to get it out. If you think you have a coolant leak, Wash off the motor as clean as you can, get the back end of it, Test the Rad cap, then do a bottle test. Do the test on clean concrete, and let it cool in the same space. That way if there is any external leaks you should be able to see them. Just a thought! __________________ 1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand. Last edited by Johnp3; 10-04-2011 at 08:47 PM. Reason: spelling

10-05-2011, 03:51 PM	#4
Johnp3 Junior Member Join Date: Nov 2009 Posts: 2,919 Points: 32,500 Thanks: 45 Thanked 430 Times in 396 Posts	If you are getting steam and the vent is sweating there is coolant in the oil, if there is foam looking stuff on the oil filler cap, you have water in it. If you search handy links it gives a full write up. __________________ 1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.

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10-04-2011, 11:38 PM	#3
mattc14 Junior Member Threadstarter Join Date: Oct 2011 Posts: 3 Points: 282 Thanks: 0 Thanked 0 Times in 0 Posts	I changed the oil and there was no water in the oil. Can you tell me how to do a bottle test? Thanks again.

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