> my current -6A has a pilot relief tube...
Geez. Why didn't I think of that!
Just drink a LOT of water on hot days and...
Get the co-pilot to contribute - double the cooling.  :)
Need more power on take off with back seat pax?
No problem....on the count of three, everybody pee...

Thanks for all the input, Guys.

Al,
I'm looking at the picture of you're coolant bottles.
OK, the pressure bottle has a feed at the bottom, and an overflow at the
top.
The overflow of the pressure bottle goes to the bottom of the overflow
bottle.

What are the two al pipes going to the pressure bottle about half way up?

What is the sensor in the overflow bottle? Low coolant? Can I get this from
NAPA?
John