LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

internal coolant leak

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Old Dec 5, 2007 | 10:40 AM
  #1  
chevyz4life's Avatar
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From: Dumas,Texas
internal coolant leak

Is there anyway it can be from the waterpump bolts? the reason why i ask is because i had just replaced the wp when it started leaking and no it did not overheat. also i'm not getting any white smoke out the tailpipes,drives fine but keep loosing coolant. any help please.
Old Dec 5, 2007 | 10:51 AM
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From: PORTLAND, OR, MULTNOMAH
You might want to have a pressure check to see if you can see any leaks. Also check your floor on heater side to see if you have a core leak.

Make sure your radiator cap is ok when you have your pressure checked.

Perhaps some Dye in the coolant will help with the location of an external leak. Just use water to locate the leak so that you don't waste coolant in the process. If you are losing coolant rapidly, you should be able to find the problem in no time. JMHO
Old Dec 5, 2007 | 11:06 AM
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can it be something other then the head gaskets cause it is getting into the oil.
Old Dec 5, 2007 | 12:43 PM
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Originally Posted by chevyz4life
can it be something other then the head gaskets cause it is getting into the oil.
Water getting in the oil is usually from a head gasket. Sometimes can be from a factory oil cooler, but you don't give any kind of specifics about your car (the sig is a good place for that).
Old Dec 5, 2007 | 03:16 PM
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Napa has a "block check" which is a fluid that you pour into a special glass container. It will determine if you have combustion gases in the cooling system without taking the car apart.

First, drop the coolant about 1-2 inches. Insert the special glass tube. Start the car. Then squeeze the bulb to draw air from the radiator (this is why you drop the coolant a bit so you don't suck up coolant). If it stays blue after a minute, then you don't have a combustion leak. If it turns yellow, then you have a combustion leak.

The combustion leak is likely from a head gasket, but could also be from a cracked cylinder or a crack in the cylinder head.
Old Dec 6, 2007 | 08:01 AM
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Originally Posted by Wild1
Napa has a "block check" which is a fluid that you pour into a special glass container. It will determine if you have combustion gases in the cooling system without taking the car apart.

First, drop the coolant about 1-2 inches. Insert the special glass tube. Start the car. Then squeeze the bulb to draw air from the radiator (this is why you drop the coolant a bit so you don't suck up coolant). If it stays blue after a minute, then you don't have a combustion leak. If it turns yellow, then you have a combustion leak.

The combustion leak is likely from a head gasket, but could also be from a cracked cylinder or a crack in the cylinder head.
So no matter what I will still have to take the heads off right.Is that expensive to have done?
Old Dec 6, 2007 | 08:20 AM
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Im with these guys. If you have antifreeze in your oil most likely its from a blown head gasket. But there are other ways. Cracked block, warped heads. My girlfriend overheated her car so bad that it expanded the heads and crushed the head gasket down so when the heads cooled, there was a gap between the block and the heads for the anti freeze to flow, but still no antifreeze in the oil. It was just burned off in the cylinder. In that case you have a cylinder that looks steam cleaned. And her antifreeze smelled like gas too. Like some one said first do a pressure test. Then check your oil for antifreeze. Hopefully the antifreeze is just leaking some where else. I never paid any one to pull heads before, but im sure its really expensive. If you have the know-how and time id take the project on your self to save money.
Old Dec 6, 2007 | 11:09 AM
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With the block check, you do not tear anything apart... just drop the coolant down an inch or two.

It is to confirm that exhaust gases are present. So, there is no need to tear your heads apart if there are no exhaust gases in your coolant.

If the block check turns blue > green > yellow, then exhaust gases are present and you will need to pull your heads apart. The cost is relative to your area but it isn't cheap. If you have tools and our handy, you can check out www.shbox.com to get an idea of what is involved.

Again, if the block check stays blue, your coolant is leaking somewhere else and there is no need to tear into the heads.
Old Dec 8, 2007 | 12:14 AM
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Ok i will check and hope its something i can do thanks.
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