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Never heard of the water evaporating out of antifreeze but I guess it's possible (but not likely assuming your system is sealed, pressurized and your coolant isn't boiling in flight).
150 might be on the cool side but certainly high enough to fly. I take off when coolant and oil temps reach 130 F. Try flying it if you are sure the temp gauges are working OK.
Tracy
On Thu, Nov 13, 2008 at 8:11 PM, Yvon Cournoyer <geryvon@videotron.ca> wrote:
I completed my annual inspection a few days ago
New engine oil
New 50/50 antifreeze/water
New drive shaft and ball bearings on cog belt PSRU. These PSRU parts I
damaged myself when dismounting from the engine.
I have not flown the aircraft yet since inspection, prolounged ground
running failed to raise the engine oil and antifreeze temperatures above
150F-155F. OAT about 32F to 35F. These engine temperatures are not
standard for my 1986 engine, which would easily reach 180F after a few
minutes of ground running at 3000 rpm.
A trusted friend has suggested that my old coolant was much too rich in
antifreeze due to the water content having evaporated over time, but
please advise
Yvon
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