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On the other hand, it seems to have forgotten its airport and navaid data, and now offers only user waypoints in response to the "Goto" command.
I suppose it would not be that much trouble to program the waypoints I use most often. On the theory that air directed along the bottom inner surface of the cowling by the splitters I installed in the inlet might be sticking to the surface for Coanda-like reasons and not getting into the oil cooler inlet duct, I installed an aluminum deflector on the floor of the plenum in such a way that it would steer this putative river of cold air into the duct.
Today the unpredictable #1 Lowrance worked, to some extent.
Now that I have replaced its internal battery, it remembers that it is supposed to be producing NMEA output for the autopilot coupler.
One question on my mind was whether I needed to provide a separate cold air intake for the intercooler, rather than use the air already in the "cold" plenum.
The temperature near the firewall is about 45 deg F above ambient -- this due to heating by the exhaust pipes and the turbocharger.
It must require moving or damaging as few existing items as possible.
My seemingly successful installation of a new battery in the #1 Lowrance has resulted in a unit that remembers its settings, but refuses to lock onto a satellite, even though it passes its self-tests okay.
Meanwhile, the #2 unit, which is currently installed in the airplane, has developed a new problem: it remains on for only a few seconds after startup, and then turns off.
I seldom cruise lower than that -- more usually above 10,000 feet.
It's evident, anyway, that there's a good deal of heat to be gotten rid of.