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Ronpor
 
Join Date: Apr 2018
Location: Melbourne, Australia
Posts: 4
Coolant Colour change

Just completed a 660 kilometre drive , about 400 miles. I noticed the coolant, instead of a blue colour is now a brown. The water pump was replaced about 3000 miles ago. Could you please explain the possible reasons ? It is a 2.7 base tiptronic Boxster. Oil level is good and no water in the oil. Water temperature normal, engine performing well. No leaks underneath car, although there was more than normal moisture on the underside of the deck lid.
It is a MY04 with 69,000 miles on it.

Last edited by Ronpor; 05-22-2018 at 03:31 PM..
Old 05-22-2018, 01:29 PM
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Registered User
 
Join Date: Jan 2004
Location: Pittsford, NY
Posts: 3,242
When coolant and oil mix, the coolant becomes a brown color. Has the car ever seriously overheated? You might want to have the coolant analyzed to make sure it is clear of oil.
If you put fresh coolant in when the pump was changed, then you need to investigate further.
A pressure check of the coolant system should tell if a cylinder head is cracked.
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Old 05-24-2018, 05:42 AM
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Join Date: Jul 2017
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Quote:
Originally Posted by tonythetarga View Post
When coolant and oil mix, the coolant becomes a brown color. Has the car ever seriously overheated? You might want to have the coolant analyzed to make sure it is clear of oil.
If you put fresh coolant in when the pump was changed, then you need to investigate further.
A pressure check of the coolant system should tell if a cylinder head is cracked.
I don't know where you'd go to have coolant analyzed. I guess I'd pull some out and put it in a clear bottle or glass and see if it separated oil out of coolant. You can get a coolant tester, which will tell you if the coolant is good or bad. Is there any sign of steam coming out of the oil filler or the tailpipe.

I think I'd take it to an indie Porsche repair and have it pressure tested and get an opinion from a decent Porsche mechanic.

And, I'd probably drain all the yucky coolant out, flush it and fill it with plain distilled water too see what would happen.
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Old 05-24-2018, 06:00 AM
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Ronpor
 
Join Date: Apr 2018
Location: Melbourne, Australia
Posts: 4
Thanks guys for your advice.
I have since dipped a cotton bud to the bottom of the coolant tank only to discover that oil in coolant is not the problem. Turns out to be a gray/green coloured gunk on the bottom of the tank.
The coolant is the normal Porsche coolant colour (pink) on the top of the gunk.
Any further suggestions would be appreciated. Perhaps when the w/pump was replaced by the Indy
the cooling system was not flushed so the gunk has just accumulated over time ?
Old 05-26-2018, 09:02 PM
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