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5.3l coolant lose

coolant lose with no signs of any leaks

5.3l coolant lose

Postby kimcoop1324 [OP] » Mar 12 2012, 1:35pm

I own a 2006 silverado with a vortex 5.3l . I have put 3 gallons of coolant in the res. Over the last few months . There are no visible leaks and truck seems to run great with the exception of noisy lifters and blue smoke on cold morning start ups. Does anyone have this issue? I heard the head may be cracked or gasket junk. Would a compression test revail a cracked head?
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Related Topics  Coolant   Coolant in Oil!   Coolant leak   Coolant Switchover   Coolant loss   Coolant Loss   Coolant flush and amount   Coolant Loss Question   mystery coolant leak   Coolant flush questions   1992 Silverado 5.7L V8 Leaking Coolant   Please help me identify cause of this coolant/water leak   Coolant leak after oil change?   Troubleshooting the low coolant light 
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Re: 5.3l coolant lose

Postby ASTE25 » Mar 13 2012, 1:27am

If you have a bad head gasket or a cracked head (assuming you are not getting water into the oil or it is not leaking to the outside of the engine) all you have to do is remove the coolant cap (when cold), start thje truck and the perssure from the compression entering the cooling system should blow coolant out the fill cap. If it does not do that I would have the cooling system pressure checked.
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Re: 5.3l coolant lose

Postby kimcoop1324 [OP] » Mar 13 2012, 10:55am

Thanks for the tip I will try that .
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5.3l coolant lose

Postby Machster69 » Mar 13 2012, 4:44pm

No, speaking from experience(2 months ago) it will not always blow coolant out the oil fill cap. If your running water you might notice excessive steam or water droplets on the oil cap. I recommend this... Goto autozone, get the uv dye for your coolant. Put it in your coolant, wait and change your oil, the green dye is easy as pie to see in your oil when you change it. Like oil mixed w/ green water, that easy! If its in your oil, head cracked and or gasket. Or worst case, cracked block(highly doubt). Have your ran the truck hot lately? This causes head warpage/ gasket issues when that heat hits em. And if its not in ur oil, use a black light and park in dark garage(or at night) and look for the dye around hoses etc...(ide start at water pump if not in oil)
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5.3l coolant lose

Postby Machster69 » Mar 13 2012, 5:01pm

A pressure test could show a leak exist, but internal leaks u cant see :)

There also is a combustion gas kit sold at napa that goes on your reservoir and detects combustion gases entering coolant(head leak)! But this isnt always certain...
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5.3l coolant lose

Postby Machster69 » Mar 13 2012, 5:04pm

Heres the thing, depending where the leak is, it might leak sometimes and then sometimes it wont. This has to do with heat and also where the piston stops when the motor is off. Sometimes it can stop and stop the leak, other times it can stop and leak room for coolant to go. Autozone(believe it or not) used to have a great diagram on their site with illustrations of what im talking about. But start w/ uv dye trick... Make sure its not getting into oil first
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Re: 5.3l coolant lose

Postby ASTE25 » Mar 13 2012, 7:30pm

Machster69 wrote:No, speaking from experience(2 months ago) it will not always blow coolant out the oil fill cap.)

I'm assuming you mean the coolant cap and not the oil cap. Read my post again. I did not say it would always blow coolant back out the coolant cap. I specificly said it would under certain conditions (only if the leak is from the combustion chamber to the coolant passage). If the leak is to the outside of the engine or to the inside oiled area's it would not, however, you would either see it leaking to the outside of the engine or notice water in the oil (aparantly that was your situation).
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Re: 5.3l coolant lose

Postby ASTE25 » Mar 13 2012, 7:36pm

Machster69 wrote:A pressure test could show a leak exist, but internal leaks u cant see :)

That is true, however, it's only got three places to go (Into the oil, outside the engine, or at the combustion chamber). You may not see the actual leak, however there will be some tel-tale signs where it is leaking: A missfire/steam out the exhaust/coolant blowing back out the coolant fill neck if it is in the compression chamber. A visible leak to the outside of the engine will be, well, visible under inspection with a pressure tester. Lastly, if it's into the oiled area of the engine you will notice water in the oil.
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5.3l coolant lose

Postby Machster69 » Mar 13 2012, 7:40pm

ASTE25 wrote:
Machster69 wrote:No, speaking from experience(2 months ago) it will not always blow coolant out the oil fill cap.)

I'm assuming you mean the coolant cap and not the oil cap. Read my post again. I did not say it would always blow coolant back out the coolant cap. I specificly said it would under certain conditions (only if the leak is from the combustion chamber to the coolant passage). If the leak is to the outside of the engine or to the inside oiled area's it would not, however, you would either see it leaking to the outside of the engine or notice water in the oil (aparantly that was your situation).

Yup i misread,sorry... but while we are at that point. Another sign of head issues is after you add dye into you coolant(idk if it works with water) your oil cap will develop a foam on it similar to great stuff but not dense or nothing. Just soft bubbly like...
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Re: 5.3l coolant lose

Postby ASTE25 » Mar 13 2012, 7:50pm

To be honest I have never used the dye. It wouldn't do me any good, I do not have a black light. lol. Seriously, I have never had a problem finding a leak. Sometimes I may not actually see the place it was leaking until I had the engine torn down, but It was always where I thought it would be. Sometimes you just don't know if it's a cracked head or a bad head gasket until you get it torn down. I would love to have one of those optical scopes so I could take a plug out and see inside the combustion chamber. I'm not ready to spend the money for one of those quite yet. I normally spend money on things like that when I'm working on one and it (whatever tool it is) will save me a lot of work.
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