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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,134
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Coolant question
After installing the water temperature gauge a few days ago, I pulled out the sending unit today to do some work on the housing. I was surprised that the new brass sending unit had some green funk on it. I use BMW approved coolant which is blue in color, end it was replaced within the last six months.
What would cause this and what’s the best way to do a coolant flush? Edit: is the coolant reacting to the brass through the small current at the sender?  
Last edited by A930Rocket; 07-05-2022 at 07:33 AM.. |
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07-04-2022, 06:21 PM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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You should test the ph level in your coolant. They make color paper test strips
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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07-05-2022, 04:06 AM
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Registered
Join Date: Jan 2008
Location: NJ
Posts: 1,186
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Try Evans coolant?
https://www.amazon.com/Coolant-EC53001-EC42001-Performance-Waterless-Gallon/dp/B014HC8HO2/ref=pd_lpo_2?pd_rd_i=B014HC8HO2&psc=1
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2013 991.1 Carrera S Cab 2004 996 Turbo CAB X50 sold 2003 996 cab 6 speed Sold 1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold DE instructor since 1985 |
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07-05-2022, 05:53 AM
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Get off my lawn!
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For my old El Camino, I flush and replace the coolant every other spring. The radiator has virtually no corrosion visible, and the water pump lasts about 70,000 miles. It is free to replace for me since I bought a lifetime guarantee water pump 29 years ago.
I have a pressure coolant flush and refill setup. As you well know, 6 month old coolant and a new sensor should not be looking like that. Is that sender a BMW branded sender, or some aftermarket one of the "wrong" material?
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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07-05-2022, 07:21 AM
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,134
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I drained and filled it about one and a half ago, when I replaced all of the coolant hoses, thermostat, water pump, etc. And then replaced coolant again in six months ago when I need some bottom in engine work.
In the old days, they have a kit that you tied into the heater hose and flushed the engine that way. Looking online, there are several brands of coolant flush. Obviously, I would want one awards with plastic and aluminum. |
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07-05-2022, 07:32 AM
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Carrera
