05 Avalon AC trouble

[Kourso]

Can someone please tell me what is the cause of poor AC performance on a 2005 Toyota Avalon.
When the outside temp is above 80 degrees the AC vent temp is 80 + degrees on a 93 degree day.
But when the outside temp is under 80 degrees, the AC vent air temp. goes down to 53-54 degrees?
The AC Freon charge, lo & hi sides seem to be ok.
For some reason the AC work’s sufficiently only on cooler days/nights.
I read it could possibly be the outside temp. sensor that gives an AC signal?
My dash digital outside temp. reading is accurate, is that reading for the same temp. sensor.
I looked for the temp. sensor on the front by the hood latch & in front of the AC condenser and did not find it.
Can you please help me locate the outside AC temp. sensor.
Thanks!

[tbirdtbird]

What you need to do first is have an AC shop (not a brake shop or Petco) use their RRR machine to recover the Freon charge and determine how much was in the system. They can determine how much it should be, and install the correct amount. This is a 20 yr old car and you probably have lost some Freon due to what we term small seasonal losses.

‘The AC Freon charge, lo & hi sides seem to be ok.’
This is not possible to determine with doing what I just described.

Look for a shop that displays the sign for MACS certification, these are the guys who know what they are really doing.