Redish-Brown Sludge In Coolant System + White-Blue Crystals! - Chevelle Tech
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post #1 of 18 (permalink) Old Apr 2nd, 20, 8:05 PM Thread Starter
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Redish-Brown Sludge In Coolant System + White-Blue Crystals!

This is what it looked like when I took of the upper radiator hose and removed the thermostat. I put in a new radiator, just wondering what else I need to do here? Do I need to flush the block out as well? Or will I need to start tearing it apart to clean it?



Thanks.




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post #2 of 18 (permalink) Old Apr 2nd, 20, 8:23 PM
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Never seen anything like that before. I'm thinking maybe that stuff could be something that was added to the cooling system to stop leaks but that's just a guess. I would remove the block drain plugs and flush the motor out first with just plane water. I would then run a cooling system flush in the car and then flush it again with water. On the hoses running to the heater core I would flush it out with water both ways. I did this with the heater core in my car and was surprised how much the water changed in color flushing one way and then the other.

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post #3 of 18 (permalink) Old Apr 2nd, 20, 9:46 PM
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

In addition to what Hank said

I would use a Scope to check the Engine Block Coolant Passages if possible

I would find some kind of Cleaning Detergent that would eat up/clean out the Block Coolant Passages and Heater core

Then Recheck the Engine Block again with the Scope

If it was mine I would tear down the Engine and have the Coolant Passages thoroughly cleaned/Acid dipped
and if possible the same for the Heater Core, if not then Replace it with a new one
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67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #4 of 18 (permalink) Old Apr 2nd, 20, 10:11 PM
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

When was the last time you had the engine running?
Have you ever seen it run?


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post #5 of 18 (permalink) Old Apr 2nd, 20, 10:40 PM Thread Starter
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Quote:
Originally Posted by LKN BCK View Post
When was the last time you had the engine running?
Have you ever seen it run?

I only ran it a couple times for about 5 minutes in the last 4 years...before that I don't have any history on it
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post #6 of 18 (permalink) Old Apr 2nd, 20, 10:43 PM Thread Starter
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Quote:
Originally Posted by Kirk's67SS View Post
In addition to what Hank said

I would use a Scope to check the Engine Block Coolant Passages if possible

I would find some kind of Cleaning Detergent that would eat up/clean out the Block Coolant Passages and Heater core

Then Recheck the Engine Block again with the Scope

If it was mine I would tear down the Engine and have the Coolant Passages thoroughly cleaned/Acid dipped
and if possible the same for the Heater Core, if not then Replace it with a new one
Quote:
Originally Posted by HKalin View Post
Never seen anything like that before. I'm thinking maybe that stuff could be something that was added to the cooling system to stop leaks but that's just a guess. I would remove the block drain plugs and flush the motor out first with just plane water. I would then run a cooling system flush in the car and then flush it again with water. On the hoses running to the heater core I would flush it out with water both ways. I did this with the heater core in my car and was surprised how much the water changed in color flushing one way and then the other.

Thank you. I'm trying to look up some videos or write-ups that can guide me through this. I've also heard of people flushing the block with a garden hose. Any videos or resources you can recommend?
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post #7 of 18 (permalink) Old Apr 2nd, 20, 10:55 PM
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Forgot to mention the Rad Core would also need to Cleaned or Flushed out

I would just buy a New Rad

You can buy a Flush Kit that you Splice into one of your Heater Hoses that has a T that you Hook up the water Hose to
there should be Instructions with the Kit on which Heater Hose to Splice into

I just think it is NOT going to be enough to clean that stuff out of the engine Water Passages
unless you can find some kind of Cleaning Agent that will work at eating the Stuff down into Flush-able small material

Did you do a Search of " Flushing out a Engine "

NOTE you only need to Flush Out the Water/Coolant Passages that keep the Engine running Coll

DO NOT Flush out the Engine Oil and it's Passages for Lubing the Engine

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #8 of 18 (permalink) Old Apr 2nd, 20, 11:01 PM Thread Starter
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Quote:
Originally Posted by Kirk's67SS View Post
Forgot to mention the Rad Core would also need to Cleaned or Flushed out

I would just buy a New Rad

You can buy a Flush Kit that you Splice into one of your Heater Hoses that has a T that you Hook up the water Hose to

I just think it is going to be enough to clean that stuff out of the engine Water Passages
unless you can find some kind of Cleaning Agent that will work at eating the Stuff down into Flush-able small material

Yep I have a new rad and flushed the heater core


Just to be clear you DONT think a flush will take care of it?
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post #9 of 18 (permalink) Old Apr 2nd, 20, 11:08 PM
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Greg.
 
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Quote:
Originally Posted by black64 View Post
Yep I have a new rad and flushed the heater core
Just to be clear you DONT think a flush will take care of it?
Added/Amended my above Post so please reread it

Maybe the Brown Sludge with the Right Chemical Deteragent
but I would be worried about that other Crystel Stuff
being in Nooks and Cranys that would not be easy to Flush out IMHO

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #10 of 18 (permalink) Old Apr 3rd, 20, 1:08 AM
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Does it look as though the crystallization is in the engine or heads/manifold? Maybe the coating or metal of the thermostat housing is all that developed that white stuff. You can do the block flush with chemicals and flush back and forth with a garden hose and see what comes out of the block. Then install a coolant hose filter in the upper radiator hose and check it regularly until satisfied, If it's a number matching engine and you don't want to risk damaging the block, I would do a complete tear down hot tank and rebuild.

I've seen the brown sludge before. From Nalcool and anti-leak clay bars the dealers were throwing in the 96 lt1's. But never that scale of crystallization.
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post #11 of 18 (permalink) Old Apr 3rd, 20, 2:24 AM
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

I agree with Al, that housing material seems to be the culprit, it's contaminated on the outer side as well. Replace housing and flush w/ cleaner.
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post #12 of 18 (permalink) Old Apr 3rd, 20, 8:31 AM
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Dan
 
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

That engine was likely sitting dormant for a long time
before you got.
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post #13 of 18 (permalink) Old Apr 3rd, 20, 8:33 AM
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Looks like electrolysis of the thermostat housing.
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post #14 of 18 (permalink) Old Apr 3rd, 20, 10:17 AM
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Yeah, pot metal housing, I'd pull the lower hose, maybe pull the water pump, if it looked clear (as in not blocked) then I'd flush and forget all about it. If I found that crap in the water pump or anywhere else, I'd be concerned. How solid is it? Does it crumble to the touch, look like it could break off and be floating around clogging heater core?
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post #15 of 18 (permalink) Old Apr 3rd, 20, 2:38 PM Thread Starter
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Re: Redish-Brown Sludge In Coolant System + White-Blue Crystals!

Quote:
Originally Posted by Pioneer4x4 View Post
Yeah, pot metal housing, I'd pull the lower hose, maybe pull the water pump, if it looked clear (as in not blocked) then I'd flush and forget all about it. If I found that crap in the water pump or anywhere else, I'd be concerned. How solid is it? Does it crumble to the touch, look like it could break off and be floating around clogging heater core?

It crumbles pretty easily and seems to dissolve into small pieces when in liquid. Just above the thermostat is the only place I have found it so far.
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