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post #1 of (permalink) Old 07-20-2017 Thread Starter
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Question Coolant Lose...Head Gasket/Block?


I have a 2005 Impala with the 3.4 liter engine*

This might be a long post so I'll apologize now for that...

I have been losing coolant for awhile now but I don't have any visible leaks...

I have done a radiator/coolant pressure test 3 separate times to make sure and it has held pressure for over an hour each time.

There is no coolant in the oil or oil in the coolant.*

I have replaced the Upper and Lower Intake Manifold gaskets

I have tried to do a block test on the radiator but no matter what I do coolant always gets sucked back up into the test tube ruining the test fluid...even after removing enough coolant that it is no longer visible when looking into the filler neck.

I just put a bottle of UV Dye in the coolant then went for a short drive and this is where it gets interesting...

I waited for it to get dark out,opened the hood and shined my UV light on the engine and the dye was peppered all over the engine (almost like a glass of water was thrown into a fan)...

No dye at all around the radiator and some light speckling here and there on the front of the engine...

But from the passenger side up over the alternator across the back of the engine and around the drivers side in a horse shoe pattern the dye was speckled all over...

There is no dye on the hood or the firewall so I don't understand how it got all over the way it did and on top of the alternator without getting on those places...if it's spraying out somewhere you would think it would be on the hood and firewall as well.

There is also some light dye droplets in the tailpipe as well.

How is it that the coolant is all over like this yet 3 different pressure checks show no signs of a leak?

I am planning on tearing the engine back down and replacing the gaskets including the head gaskets (which I should have done to begin with) but am unsure if it might be a cracked blocked which would be pointless if it is.

Any help would be greatly appreciated*

Thank You
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post #2 of (permalink) Old 07-20-2017
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Exhaust from fans spray it all over the place making it difficult to find the source.

How come you didn't mention a check of the water pump? A leaking bearing may pass a pressure test but could cause a leak from its weep hole and the fans and vehicle motion will splatter it all over..
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Hi Thomcat,

The water pump was recently replaced a few months back.

There is no dye around the water pump or weep hole other then the splattering mention in my last post.

No dye on any of the pullies,belts or cooling fans to indicate that's what is splattering the dye either.

The pattern of the dye is what's odd to me and is making it hard to even begin to pin point an area
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