Out of the Box....
The avionics shop checked the antennas, 2:1, avidyne 440 units , two of them installed.
What I know about Avidyne is not a lot, but, they get real hot.
At OSH and Sun/Fun I could not keep my hand on the side of a 440.
I think that is about 140 degrees, electronic hardware does not like those temps....and your in Texas ( yes, it's November).
Even Garmin 327 transponders have temp sensors internal that will lower
the power output if pinged beyond limits.
My 430 does not run with a fan, but, If I did install an Avidyne 440 in it's place
a HUGE FAN would also be installed.
OK, enuff John