Losing water from the expansion tank, no leaks/contamination, I think its the block.. - Defender Source
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  #1  
Old June 21st, 2012, 01:37 PM
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Question Losing water from the expansion tank, no leaks/contamination, I think its the block..

Well I think its about that time. No visible leaks anywhere, radiator was re-conditioned a year ago, brass plugs around the filler tubes have clean gaskets, all hoses fairly new. Nothing around the water pump. I now have to fill the expansion tank with about 1 1/2 cup of water every 2 weeks and I can't find out where the water leaking to. No cross contamination in the oil or coolant. So I think its time for me to install that 4.6 What say ye thy experts?
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Old June 21st, 2012, 06:23 PM
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Jason England
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Same here ... Planning Tdi upgrade
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Old June 21st, 2012, 07:27 PM
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Have you checked the cap, to make sure it is sealing correctly? Swap on from one of your other trucks.
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Old June 22nd, 2012, 09:26 AM
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i have notice the same thing in my truck over the last 3 years. i fill the tank and when i check it again, it only has about 1/2 in the bottom. just like neil, no signs of leaks anywhere. truck never runs hot, and it will only leak down the the 1/2 level, no more than that so i just figured it was normal.... i have 144k miles on it
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Old June 22nd, 2012, 09:44 AM
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I thought the expansion tank was suppose to be about half full cold.
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Old June 22nd, 2012, 10:44 AM
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Shouldn't the expansion tank settle at a certain level after a few drives? I think so... but if it is consistently going down then there is an issue.
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Old June 22nd, 2012, 01:32 PM
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Yeah the cap gasket is fine. I think I'll just buy another one just for the hell of it. the water actually got empty at the expansion tank one time, I literally had to fill it with a garden hose. I definately have a leak somewhere, but I'm just thinking its the perfect excuse to put that new 4.6 block I have.
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Old June 22nd, 2012, 01:38 PM
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Chris luciano
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Mine was doing the same thing, drove me crazy. I couldn't find a leak anywhere, no puddles nothing. It was the small line under the tank, it would leak down the hose when it felt like it but wasn't puddling anywhere. What about on the backside around the valley pan gasket?

Install the 4.6 either way.
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Old June 22nd, 2012, 02:02 PM
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valley pan has a few cracks in the front and is a little dirty but I don't think its leaking. I think I'm just going to plan to swap the motor out this summer.
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Old June 22nd, 2012, 02:56 PM
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check the back of the heads
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