...or you could switch to a mechanical float like I used.  No failures as yet (works every time I push down on the float).  Its available from McMaster Carr (http://www.mcmaster.com/ ).  Be sure to check the temp specs though. 

 

Mark S.

 

On 4/12/07, Dennis Haverlah <clouduster@austin.rr.com> wrote:

I have an optical liquid level sensor in my air/coolant
seperator/expansion tank.  It worked OK in tests.  After ground testing
the engine for about one hour while auto-tuning and taxi testing, I
drained some coolant out of the system to expose the coolant level
sensor to make sure it still worked.  It did not indicate low coolant!
I removed the probe and found it had a scum deposit - when wiped clean
it worked.  My engine came out of a 2004 RX-8 and had 9400 miles on it.
My cooland is 60% distilled water and 40 % Prestone - yellow -
antifreeze.  I have not added any water-wetter but will check today on
John Deer's product.  The coolant is always slightly cloudy.  The engine
had some antifreeze in it when I recieved it and I flushed the coolant
system.  I also changed the antifreeze after about 4 hours of ground
operation.  Is there any solution - additive to keep the system cleaner,
is there a better coolant level dector - or do I need to hire a scum
cleaner to keep it clean??  I guess I could give up and just watch the
coolant pressure for clues.

Thanks,
Dennis H.

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