Brown sludge in coolant ?

Aircal

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2000 Chy Voyager 3.3l. Dosn't overheat but a month or so back I found the coolant was a sludge almost mud type of mixture. One of the boys thought maybe he poured trans fluid in by mistake. The other bouth and added they wrong type of anti freeze. So I flushed it 3 times over 2 days and refilled it.
Well it looks like mud again. Real thick, almost dries like clay.
Help needed !!!!
 

Flyn

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1. Good answer. Flush again in case the sludge is residue that the new coolant is washing off the inside of the lines (good).

2. Bad answer. Take off your oil cap, look inside, remove your dipstick and look at it to see if you have residue there or clean oil. If residue, you may have a blown head gasket and have oil and antifreeze mixing (bad).
 

hellraiser319

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Only thing I can think of aside from what Flyn said, if you did any recent work to it, didn't let the RTV fully cure before pouring antifreeze in, it likes to wash up by the cap. But that's a little grayer of a brownish color...
 

Sprayin

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Chocolate milkshake is oil. Strawberry milkshake is ATF. Yours sounds like oil.

1. Good answer. Flush again in case the sludge is residue that the new coolant is washing off the inside of the lines (good).
Even if that is the case it was leaking at some point. If he has never noticed the problem before, odds are its still leaking. Gotta fix the problem, not the symptom.
 

Flyn

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Easy enough to check if it's red pill or blue pill by looking at the oil. Blue pill is less likely but MUCH cheaper to fix. Red pill is expensive, sometimes to the point of taking the vehicle to Carmax and getting what you can for it.
 
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Aircal

Aircal

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Oil looks great. Trans was rebuilt after I flushed.
I don't think it's left over, but could be, but the vents all look filled. I'll try having it flushed again next week.
 

G_T_P

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Maybe it's stop leak? I've had a couple people put stop leak in and eventually it turned to sludge. I had to back flush the shit outta the heater cores for a while. I just kept flushing until it was all out.
 
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Aircal

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No I didn't add anything just the dodge style anti freeze.
 

Sprayin

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Just because you're getting oil in the coolant doesn't mean you will get coolant in the oil.
 

rdsnake

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Thats the start of a blown head gasket. If you had oil or trans fluid in the coolant you would know right away
 

C.Evans

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Just because you're getting oil in the coolant doesn't mean you will get coolant in the oil.
If oil goes into cooling system, coolant should be in oil considering the cooling system is under pressure and would go right through where the oil came from.
 
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Aircal

Aircal

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If oil goes into cooling system, coolant should be in oil considering the cooling system is under pressure and would go right through where the oil came from.
researching this on google, quiet a lot of arguments about this statement..lol
Many said even though they flushed it would come back several times as it gets stuck in pockets. Many think its air mixing in the system or mixing of anti-freeze. I'll get the cooling system pressure checked.
 

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