Todays coolant flush. Warning, lots of pics.

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Did an interesting rad flush today, looks like the coolant had never been changed before. It was pitch black. We ran a chemical through his system for about 10 minuites and flushed out his system with 15 litres of green coolant. The hookups were in a tight spot, so I removed the air filter housing. The whole set up resulted in countless burns. Anyways, enjoy. The supposed to be green coolant. The coolant res. The setup the connections
 
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I'm surprised the flush isn't done with a non-toxic fluid and then refilled with anti-freeze. Probally getting a correct concentration afterwards is a liability.
 
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 Originally Posted By: Dr_No
Did an interesting rad flush today, looks like the coolant had never been changed before. It was pitch black.
That makes me sad. \:\(
 

Dr_No

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 Originally Posted By: Audi Junkie
I'm surprised the flush isn't done with a non-toxic fluid and then refilled with anti-freeze. Probally getting a correct concentration afterwards is a liability.
We use a chemical that is recycled along with the coolant. we flush thoughh a 50-50 mix of glycol and water. The capacity of the van was like 12 lires and i flushed 15.
 
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Is it possible the owner dumped some radiator sealer in it and that is why the fluid so dark?. I know when I tried fixing a leaky radiator and used the pellet radiator sealer the fluid turn exactly like that. If not, I have never seen fluid like that.
 

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The car was an 02. The guy said he dosen't think he's ever changed it. It had around 172,000km's on it. I asked him if he had added any additives into the rad before I flushed it. The pH was around 4. Borderline acidic is about 7. Good coolant should be 10-11.
 
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 Originally Posted By: Dr_No
The pH was around 4.
That's the same acidity as tomato juice. Considering tomato juice can clean the tarnish off a copper penny overnight, I wonder what it would do inside a cooling system over a few years?
 
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There was a tsb from Ford related to discolored coolant. I was due to the anti-leak tablets used from the factory staining the very pale yellow color of the Motorcraft Gold coolant brown. This only affected a few models, as they changed the formulation of their anti-leak tabs quickly. The coolant pictured seems to have suffored this fate....though its rather dark, so it may be a combination of various factors, one of which is most certainly cooling system neglect.
 
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