Refrigerant is not low. I repeat - refrigerant is not low.
A/C is not "freezing" up.
A/C works every morning. Turn off A/C or stop and get gas after engine is running for 5 minutes and hit or miss if A/C will turn back on.
On hot afternoon A/C may not blow cold. Turning on A/C will result in "click" from what I can only assume is A/C clutch engaging and engine sounds as if there is slight strain put on it, however, A/C tube is NOT cold.
Let the car cool down and crank up several hours later at 11PM and A/C runs like a champ. A/C tube checked earlier is now cold.
I was thinking this was the A/C relay but I hear that standard "click" and slight strain put on engine even when A/C is not working so ..... second guessing myself now. A constant given is A/C will work on warm days. On very hot days or if A/C is turned off after driven a few miles A/C may not turn back on until evening. No issues that I am aware of with dash electrical - again - turn on AC and "click" with slight engine strain though A/C tube not cold.
What is the scenario where clutch engages but tube is not cold (until you let engine rest and crank up at 11PM and all is fine)?
Refrigerant was only topped off due to original issue. I found a very similar thread on another site describing almost the exact same thing (though not intermittent) with drop in RPM when A/C is turned on (but no cold A/C tube) where problem was resolved with relay.
I blew out A/C fan blower relay and A/C MG relay along with seats with contact cleaner and swapped. If issue is resolved I am done; on off chance that blower stops working in future I will buy a new relay. If same issue persists (A/C stops working on hot days with swapped relay) I will replace swapped 25year old relay but not hold my breath that issue is resolved.