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Tonights Trick-Question: Do I have a blown head gasket? Can you guess right?

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Old 02-26-2011, 10:04 PM
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Default Tonights Trick-Question: Do I have a blown head gasket? Can you guess right?

This trick question is inspired by a recent post on this forum.

A customer presents a truck they recently purchased to you and complains of bubbling/boiling in the coolant reservoir tank after they shut of the engine. Upon inspection of the radiator and the overflow tank they see this:









BROWN "STUFF"!

The car is not overheating, and there is no milky/unusual substances in the oil pan, dipstick, or back side of the oil cap. The substance resembles chocolate milk/mud/gunk... brown in color.


What would you guess the issue to be?



Last edited by djhives; 02-26-2011 at 10:28 PM.
Old 02-26-2011, 10:07 PM
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I'm guessing cooling system is overloaded with stop leak.
Old 02-26-2011, 10:18 PM
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If your radiator cap is bad it will cause your antifreeze to boil cause its not putting pressure on the system.
Old 02-26-2011, 10:19 PM
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Originally Posted by Erock67
I'm guessing cooling system is overloaded with stop leak.

Good guess, but no.

Guess again...
Old 02-26-2011, 10:22 PM
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Originally Posted by 91351
If your radiator cap is bad it will cause your antifreeze to boil cause its not putting pressure on the system.

...this is all true - but the question revolves around the brown substance in the radiator and overflow tank.... what is it?
Old 02-26-2011, 10:27 PM
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Rust? Extreme electrolosys?
Old 02-26-2011, 10:28 PM
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Rust from using tap water instead of coolant... or not enough coolant in the mix?... Plus the bad rad cap.
Old 02-26-2011, 10:37 PM
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Talking

Originally Posted by Erock67
Rust from using tap water instead of coolant... or not enough coolant in the mix?... Plus the bad rad cap.



YES!!! WOW you guys are TOO GOOD!!! I thought It would stump more of you!!!

What you see in the PICTURES is what TAP WATER ONLY in your radiator does after a few months!! I've done it myself!

The remedy is a thorough flushing.

The substance that forms in your radiator is this gnarly brown muddish that makes it seem like something VERY serious (head gasket for ex.) is wrong with your engine! But its just what happens in a tap water only cooling system after a while.


THNX for playing - perhaps the info will help someone in the future -- and another bit of knowledge to know when some one get a case of the the head-gasket phobia!

Old 02-26-2011, 10:42 PM
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I have that same thing with my truck. Guess I'll go down to ford and have them flush it out good. :-) Should I track down a new radiator cap while I'm at it?
Old 02-26-2011, 11:42 PM
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So what do we win? Haha


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